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Oracle® Secure Backup Reference
Release 10.3

Part Number E12838-04
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Glossary

active location

A location in a tape library or tape drive.

administrative domain

A group of computers on your network that you manage as a common unit to perform backup and restore operations. An administrative domain must include one and only one administrative server. It can include the following:

An administrative domain can consist of a single host that assumes the roles of administrative server, media server, and client.

administrative server

The host that stores configuration information and catalog files for hosts in the administrative domain. There must be one and only one administrative server for each administrative domain. One administrative server can service every client on your network. The administrative server runs the scheduler, which starts and monitors backups within the administrative domain.

Apache Web server

A public-domain Web server used by the Oracle Secure Backup Web tool.

attachment

The physical or logical connection (the path in which data travels) of a tape device to a host in the administrative domain.

automated certificate provisioning mode

A mode of certificate management in which the Certification Authority (CA) signs and then transfers identity certificates to hosts over the network. This mode of issuing certificates is vulnerable to a possible, although extremely unlikely, man-in-the-middle attack. Automated mode contrasts with manual certificate provisioning mode.

backup encryption

The process of obscuring backup data so that it is unusable unless decrypted. Data can be encrypted at rest, in transit, or both.

backup ID

An integer that uniquely identifies a backup section.

backup image

The product of a backup operation. A single backup image can span multiple volumes in a volume set. The part of a backup image that fits on a single volume is called a backup section.

backup image file

The logical container of a backup image. A backup image consists of one file. One backup image consists of one or more backup sections.

backup image label

The data on a tape that identifies file number, backup section number, and owner of the backup image.

backup job

A backup that is eligible for execution by the Oracle Secure Backup scheduler. A backup job contrasts with a backup request, which is an on-demand backup that has not yet been forwarded to the scheduler with the backup --go command.

backup level

The level of an incremental backup of file-system data. Oracle Secure Backup supports 9 different incremental backup levels for a file-system backup.

backup operation

A process by which data is copied from primary media to secondary media. You can use Oracle Secure Backup to make a file-system backup, which is a backup of any file or files on the file system. You can also use the Oracle Secure Backup SBT library with Recovery Manager (RMAN) to back up the database to tape.

backup piece

A backup file generated by Recovery Manager (RMAN). Backup pieces are stored in a logical container called a backup set.

backup request

An on-demand backup that is held locally in obtool until you run the backup command with the --go option. At this point Oracle Secure Backup forwards the requests to the scheduler, at which time each backup request becomes a backup job and is eligible to run.

backup schedule

A description of when and how often Oracle Secure Backup should back up the files specified by a dataset. The backup schedule contains the names of each dataset file and the name of the media family to use. The part of the schedule called the trigger defines the days and times when the backups should occur. In obtool, you create a backup schedule with the mksched command.

backup section

A portion of a backup image file that exists on a single tape. One backup image can contain one or more backup sections. Each backup section is uniquely identified by a backup ID.

backup transcript

A file that contains the standard output from a particular backup dispatched by the Oracle Secure Backup scheduler.

backup window

A time frame in which a backup operation can be processed.

barcode

A symbol code, also called a tag, that is physically applied to a volume for identification purposes. Oracle Secure Backup supports the use of tape libraries that have an automated means to read barcodes.

blocking factor

The number of 512-byte blocks to include in each block of data written to each tape drive. By default, Oracle Secure Backup writes 64K blocks to tape, which is a blocking factor of 128. Because higher blocking factors usually result in better performance, you can try a blocking factor larger than the obtar default. If you pick a value larger than is supported by the operating system of the server, then Oracle Secure Backup fails with an error.

CA

See Certification Authority (CA)

catalog

A repository that records backups in an Oracle Secure Backup administrative domain. You can use the Oracle Secure Backup Web tool or obtool to browse the catalog and determine what files you have backed up. The catalog is stored on the administrative server.

certificate

A digitally signed statement from a Certification Authority (CA) stating that the public key (and possibly other information) of another entity has a value. The X.509 standard specifies the format of a certificate and the type of information contained in it: certificate version, serial number, algorithm ID, issuer, validity, subject, subject public key information, and extensions such as key usage (signing, encrypting, and so on). A variety of methods are used to encode, identify, and store the certificate.

Certification Authority (CA)

An authority in a network that performs the function of binding a public key pair to an identity. The CA certifies the binding by digitally signing a certificate that contains a representation of the identity and a corresponding public key. The administrative server is the CA for an Oracle Secure Backup administrative domain.

CIFS (Common Internet File System)

An Internet file-system protocol that runs on top of TCP/IP (Transmission Control Protocol/Internet Protocol).

class

A named set of rights for Oracle Secure Backup users. A class can have multiple users, but each user can belong to one and only one class.

client

Any computer or server whose files Oracle Secure Backup backs up or restores.

content-managed expiration policy

A volume with this type of expiration policy expires when each backup piece on the volume is marked as deleted. You can make Recovery Manager (RMAN) backups, but not file-system backups, to content-managed volumes. You can use RMAN to delete backup pieces.

cumulative incremental backup

A type of incremental backup in which Oracle Secure Backup copies only data that has changed at a lower backup level. For example, a level 3 incremental backup copies only that data that has changed since the most recent backup that is level 2 or lower.

daemons

Background processes that are assigned a task by Oracle Secure Backup during the execution of backup and restore operations. Some daemons run continually and others are started and stopped as required.

data management application (DMA)

An application that controls a backup or restore operation over the Network Data Management Protocol (NDMP) through connections to a data service and tape service. The DMA is the session master, whereas the NDMP services are the slaves. In an Oracle Secure Backup administrative domain, obtar is an example of a DMA.

data service

An application that runs on a client and provides Network Data Management Protocol (NDMP) access to database and file-system data on the primary storage system.

data transfer element (DTE)

A secondary storage device within a tape library. In libraries that contain multiple tape drives, DTEs are sequentially numbered starting with 1.

database backup storage selector

An Oracle Secure Backup configuration object that specifies characteristics of Recovery Manager (RMAN) SBT backups. The storage selector act as a layer between RMAN, which accesses the database, and the Oracle Secure Backup software, which manages the backup media.

database ID (DBID)

An internal, uniquely generated number that differentiates databases. Oracle creates this number automatically when you create the database.

dataset

The contents of a file-system backup. A dataset file describes dataset. For example, you could create the dataset file my_data.ds to describe a dataset that includes the /home directory on host brhost2.

dataset directory

A directory that contains dataset files. The directory groups dataset files as a set for common reference.

dataset file

A text file that describes a dataset. The Oracle Secure Backup dataset language provides a text-based means to define file-system data to back up.

defaults and policies

A set of configuration data that specifies how Oracle Secure Backup runs in an administrative domain.

device discovery

The process by which Oracle Secure Backup automatically detects devices accessed through Network Data Management Protocol (NDMP) and configuration changes for such devices.

device special file

A file name in the /dev file system on UNIX or Linux that represents a hardware tape device. A device special file does not specify data on disk, but identifies a hardware unit and the device driver that handles it. The inode of the file contains the device number, permissions, and ownership data. An attachment consists of a host name and the device special file name by which that device is accessed by Oracle Secure Backup.

differential incremental backup

A type of incremental backup in which Oracle Secure Backup copies only data that has changed at the same or lower backup level. This backup is also called a level 10 backup. Oracle Secure Backup does not support the level 10 backup on some platforms, including Network Attached Storage (NAS) devices such as a Network Appliance filer.

DMA

See data management application (DMA)

domain

A group of computers and devices on a network that are administered as a unit with common rules and procedures. Within the internet, domains are defined by the IP address. All devices sharing a common part of the IP address are said to be in the same domain.

error rate

The number of recovered write errors divided by the total blocks written, multiplied by 100.

exclusion statement

Specifies a file or path to be excluded from a backup operation.

expiration policy

The means by which Oracle Secure Backup determines how volumes in a media family expire, that is, when they are eligible to be overwritten. A media family can either have a content-managed expiration policy or time-managed expiration policy.

Fiber Distributed Data Interface (FDDI)

A set of ANSI protocols for sending digital data over fiber optic cable. FDDI networks are token-passing networks, and support data rates of up to 100 Mbps. FDDI networks are typically used as backbones for wide-area networks.

Fibre Channel

A protocol used primarily among devices in a Storage Area Network (SAN).

file-system backup

A backup of files on the file system initiated by Oracle Secure Backup. A file-system backup is distinct from a Recovery Manager (RMAN) backup made through the Oracle Secure Backup SBT interface.

filer

A network-attached appliance that is used for data storage.

firewall

A system designed to prevent unauthorized access to or from a private network.

full backup

An operation that backs up all of the files selected on a client. Unlike in an incremental backup, files are backed up whether they have changed since the last backup or not.

identity certificate

An X.509 certificate signed by the Certification Authority (CA) that uniquely identifies a host in an Oracle Secure Backup administrative domain.

incremental backup

An operation that backs up only the files on a client that changed after a previous backup. Oracle Secure Backup supports 9 different incremental backup levels for file-system backups. A cumulative incremental backup copies only data that changed since the most recent backup at a lower level. A differential incremental backup, which is equivalent to a level 10 backup, copies data that changed since an incremental backup at the same or lower level.

An incremental backup contrasts with a full backup, which always backs up all files regardless of when they last changed. A full backup is equivalent to an incremental backup at level 0.

job list

A catalog created and maintained by Oracle Secure Backup that describes past, current, and pending backup jobs.

job summary

A text file report produced by Oracle Secure Backup that describes the status of selected backup and restore jobs. Oracle Secure Backup generates the report according to a user-specified job summary schedule.

job summary schedule

A user-defined schedule for generating job summaries. You create job summary schedules with the mksum command in obtool.

location

A location is a place where a volume physically resides; it can be the name of a tape library, a data center, or an offsite storage facility.

manual certificate provisioning mode

A mode of certificate management in which you must manually export the signed identity certificate for a host from the administrative server, transfer it to the host, and manually import the certificate into the wallet of the host. Unlike automated certificate provisioning mode, this mode is not vulnerable to a possible (if extremely unlikely) man-in-the-middle attack.

media family

A named classification of backup volumes that share the same volume sequence file, expiration policy, and write window.

media server

A computer or server that has at least one tape device connected to it. A media server is responsible for transferring data to or from the tape devices that are attached to it.

mount mode

The mode indicates the way in which Oracle Secure Backup can use a volume physically loaded into a tape drive. Valid values are read-only, write/append, overwrite, and not mounted.

NAS

See Network Attached Storage (NAS)

native access mode

A synonym for primary access mode.

NDMP

See Network Data Management Protocol (NDMP)

NDMP access mode

The mode of access for a filer or other host that uses Network Data Management Protocol (NDMP) for communications within the administrative domain. NDMP access mode contrasts with primary access mode, which uses the Oracle Secure Backup network protocol. Note that Oracle Secure Backup uses NDMP for data transfer among hosts regardless of whether a host is accessed through the primary or NDMP access modes.

Network Attached Storage (NAS)

A NAS server is a computer on a network that hosts file systems. The server exposes the file systems to its clients through one or more standard protocols, most commonly Network File System (NFS) and CIFS (Common Internet File System).

Network Data Management Protocol (NDMP)

An open standard protocol that defines a common architecture for backups of heterogeneous file servers on a network. This protocol allows the creation of a common agent used by the central backup application, called a data management application (DMA), to back up servers running different operating systems. With NDMP, network congestion is minimized because the data path and control path are separated. Backup can occur locally—from file servers direct to tape drives—while management can occur centrally.

Network File System (NFS)

A client/server application that gives all network users access to shared files stored on computers of different types. NFS provides access to shared files through an interface called the Virtual File System (VFS) that runs on top of TCP/IP (Transmission Control Protocol/Internet Protocol). Users can manipulate shared files as if they were stored on local disk. With NFS, computers connected to a network operate as clients while accessing remote files, and as servers while providing remote users access to local shared files. The NFS standards are publicly available and widely used.

NT File System (NTFS)

One of the file systems for the Windows operating system. NTFS has features to improve reliability, such as transaction logs to help restore from disk failures.

OB access mode

A synonym for primary access mode.

obfuscated wallet

A wallet whose data is scrambled into a form that is extremely difficult to read if the scrambling algorithm is unknown. The wallet is read-only and is not protected by a password. An obfuscated wallet supports single sign-on (SSO).

object

An instance configuration data managed by Oracle Secure Backup: class, Oracle Secure Backup user, host, tape device, tape library, backup schedule, and so on. Objects are stored as files in subdirectories of admin/config in the Oracle Secure Backup home.

obtar

The underlying engine of Oracle Secure Backup that moves data to and from tape. obtar is a descendent of the original Berkeley UNIX tar(2) command.Although obtar is typically not accessed directly, you can use it to back up and restore files or directories specified on the command line. obtar enables the use of features not exposed through obtool or the Web tool.

obtool

The principal command-line interface to Oracle Secure Backup. You can use this tool to perform all Oracle Secure Backup configuration, backup and restore, maintenance, and monitoring operations. The obtool utility is an alternative to the Web tool.

off-site backup

A backup that is equivalent to a full backup except that it does not affect the full/incremental backup schedule. An off-site backup is useful when you want to create an backup image for off-site storage without disturbing your incremental backup schedule.

on-demand backup

A file-system backup initiated through the backup command in obtool or the Oracle Secure Backup Web tool. The backup is one-time-only and either runs immediately or at a specified time in the future. An on-demand backup contrasts with a scheduled backup, which is initiated by the Oracle Secure Backup scheduler.

operator

A person whose duties include backup operation, backup schedule management, tape swaps, and error checking.

operator host

When using obtar, this is the host on which you run the obtar command.

Oracle Secure Backup home

The directory in which the Oracle Secure Backup software is installed. The Oracle Secure Backup home is typically /usr/local/oracle/backup on UNIX/Linux and C:\Program Files\Oracle\Backup on Windows. This directory contains binaries and configuration files. The contents of the directory differ depending on which role is assigned to the host within the administrative domain.

Oracle Secure Backup logical unit number

A number between 0 and 31 used to generate unique device special file names during device configuration (for example: /dev/obt0, /dev/obt1, and so on). Although it is not a requirement, unit numbers typically start at 0 and increment for each additional tape device of a given type, whether tape library or tape drive.

The Oracle Secure Backup logical unit number should not be confused with the SCSI LUN. The SCSI LUN is part of the hardware address of the device, whereas the Oracle Secure Backup logical unit number is part of the name of the device special file.

Oracle Secure Backup user

A defined account within an Oracle Secure Backup administrative domain. Oracle Secure Backup users exist in a separate namespace from operating system users.

original volume

The volume from which a duplicate is made.

originating location

A location where a volume was first written.

overwrite

The process of replacing a file on your system by restoring a file that has the same file name.

PNI (Preferred Network Interface)

The network interface that is necessary to transmit data to be backed up or restored. A network can have multiple physical connections between a client and the server performing a backup or restore on behalf of that client. For example, a network can have both Ethernet and Fiber Distributed Data Interface (FDDI) connections between a pair of hosts. PNI enables you to specify, on a client-by-client basis, which of the server's network interfaces is necessary.

preauthorization

An optional attribute of an Oracle Secure Backup user. A preauthorization gives an operating system user access to specified Oracle Secure Backup resources.

primary access mode

The mode of access for a host that uses the Oracle Secure Backup network protocol for communications within the administrative domain. Oracle Secure Backup must be installed on hosts that use primary access mode. In contrast, hosts that use NDMP access mode do not require Oracle Secure Backup to be installed. Note that Oracle Secure Backup uses Network Data Management Protocol (NDMP) for data transfer among hosts regardless of whether a host is accessed through the primary or NDMP access modes.

private key

A number that corresponds to a specific public key and is known only to the owner. Private and public keys exist in pairs in all public key cryptography systems. In a typical public key cryptosystem, such as RSA, a private key corresponds to exactly one public key. You can use private keys to compute signatures and decrypt data.

privileged backup

File-system backup operations initiated with the --privileged option of the backup command. On UNIX and Linux systems, a privileged backup runs under the root user identity. On Windows systems, the backup runs under the same account (usually Local System) as the Oracle Secure Backup service on the Windows client.

public key

A number associated with a particular entity intended to be known by everyone who must have trusted interactions with this entity. A public key, which is used with a corresponding private key, can encrypt communication and verify signatures.

restore operation

Copies files from the volumes in a tape device to the designated system.

retention period

The length of time that data in a volume set is not eligible to be overwritten. The retention period is an attribute of a time-managed media family. The retention period begins at the write window close time. For example, if the write window for a media family is 7 days, then a retention period of 14 days indicates that the data is eligible to be overwritten 21 days from the first write to the first volume in the volume set.

Recovery Manager (RMAN)

A utility supplied with Oracle Database used for database backup, restore, and recovery. RMAN is a separate application from Oracle Secure Backup. Unlike RMAN, you can use Oracle Secure Backup to back up any file on the file system—not just database files. Oracle Secure Backup includes an SBT interface that RMAN can use to back up database files directly to tape.

rights

Privileges within the administrative domain that are assigned to a class. For example, the perform backup as self right is assigned to the operator class by default. Every Oracle Secure Backup user that belongs to a class is granted the rights associated with this class.

roles

The functions that hosts in your network can have during backup and restore operations. There are three roles in Oracle Secure Backup: administrative server, media server, and client. A host in your network can serve in any of these roles or any combination of them. For example, the administrative server can also be a client and media server.

rotation policy

A rotation policy defines the physical management of backup media throughout the media life cycle. It determines in what sequence and at which times each volume moves from the initial active location where it is written, through another location, and so on, until it is reused.

SAN

See Storage Area Network (SAN)

SBT interface

A media management software library that Recovery Manager (RMAN) can use to back up to tertiary storage. An SBT interface conforms to a published API and is supplied by a media management vendor. Oracle Secure Backup includes an SBT interface for use with RMAN.

schedule

A user-defined time period for running scheduled backup operations. File-system backups are triggered by a schedule, which you can create with the mksched command in obtool. In contrast, on-demand backups are one-time-only backups created with the backup command.

scheduled backup

A file-system backup that is scheduled through the mksched command in obtool or the Oracle Secure Backup Web tool (or is modified by the runjob command). A backup schedule describes which files should be backed up. A trigger defined in the schedule specifies when the backup job should run.

scheduler

A daemon (obscheduled) that runs on an administrative server and is responsible for managing all backup scheduling activities. The scheduler maintains a job list of backup jobs scheduled for execution.

service daemon

A daemon (observiced) that runs on each host in the administrative domain that communicates through primary access mode. The service daemon provides a wide variety of services, including certificate operations.

SCSI

See Small Computer System Interface (SCSI)

SCSI LUN

Logical unit number of aSmall Computer System Interface (SCSI) tape device. Logical unit numbers make it possible for several tape devices to share a single SCSI ID. Do not confuse with Oracle Secure Backup logical unit number.

Secure Sockets Layer (SSL)

A cryptographic protocol that provides secure network communication. SSL provides endpoint authentication through a certificate. Data transmitted over SSL is protected from eavesdropping, tampering or message forgery, and replay attacks.

Small Computer System Interface (SCSI)

A parallel I/O bus and protocol that permits the connection of a variety of peripherals to host computers. Connection to the SCSI bus is achieved through a host adapter and a peripheral controller.

snapshot

A consistent copy of a volume or a file system. Snapshots are supported only for Network Appliance filers running Data ONTAP 6.4 or later.

SSL

See Secure Sockets Layer (SSL)

Storage Area Network (SAN)

A high-speed subnetwork of shared storage devices. A SAN is designed to assign data backup and restore functions to a secondary network where so that they do not interfere with the functions and capabilities of the server.

storage elements

Physical locations with a tape library where a volume can be stored and retrieved by the library's robotic arm.

storage location

A location outside of a tape library or tape drive where a volume can be stored.

super-directory

A fictitious directory displayed when browsing file-system backups, that contains all files and directories saved from the top-most file-system level.

tape device

A tape drive or tape library identified by a user-defined device name.

tape drive

A tape device that reads and writes data stored on a tape. Tape drives are sequential-access, which means that they must read all preceding data to read any particular piece of data. Tape drives are accessible through various protocols, including Small Computer System Interface (SCSI) and Fibre Channel. A tape drive can exist standalone or in a tape library.

tape library

A medium changer that accepts Small Computer System Interface (SCSI) commands to move a volume between storage elements and a tape drive.

tape service

A Network Data Management Protocol (NDMP) service that transfers data to and from secondary storage and allows the data management application (DMA) to manipulate and access secondary storage.

TCP/IP (Transmission Control Protocol/Internet Protocol)

The suite of protocols used to connect hosts for transmitting data over networks.

time-managed expiration policy

A media family expiration policy in which every volume in a volume set can be overwritten when they reach their volume expiration time. Oracle Secure Backup computes the volume expiration time by adding the volume creation time for the first volume in the set, the write window time, and the retention period.

For example, you set the write window for a media family to 7 days and the retention period to 14 days. Assume that Oracle Secure Backup first wrote to the first volume in the set on January 1 at noon and subsequently wrote data on 20 more volumes in the set. In this scenario, all 21 volumes in the set expire on January 22 at noon.

You can make Recovery Manager (RMAN) backups or file-system backups to volumes that use a time-managed expiration policy.

trigger

The part of a backup schedule that specifies the days and times at which the backups should occur.

Universal Unique Identifier (UUID)

An identifier used for tagging objects across an Oracle Secure Backup administrative domain.

UNIX-style wildcard syntax

A set of wildcard characters used in searches on UNIX and Linux operating systems. The asterisk symbol (*) represents any string of 0 or more characters. The question mark symbol (?) represents any single character. Brackets ([]) define a character class for a single character. A backslash (\) escapes any of the previous special characters. Use \\ to match a backslash

unprivileged backup

File-system backups created with the --unprivileged option of the backup command. When you create or modify an Oracle Secure Backup user, you associate operating system accounts with this user. Unprivileged backups of a host run under the operating system account associate with Oracle Secure Backup user who initiates the backup.

volume

A volume is a unit of media, such as an 8mm tape. A volume can contain multiple backup images.

volume creation time

The time at which Oracle Secure Backup wrote backup image file number 1 to a volume.

volume expiration time

The date and time on which a volume in a volume set expires. Oracle Secure Backup computes this time by adding the write window duration, if any, to the volume creation time for the first volume in the set, then adding the volume retention period.

For example, assume that a volume set belongs to a media family with a retention period of 14 days and a write window of 7 days. Assume that the volume creation time for the first volume in the set was January 1 at noon and that Oracle Secure Backup subsequently wrote data on 20 more volumes in the set. In this scenario, the volume expiration time for all 21 volumes in the set is January 22 at noon.

volume ID

A unique alphanumeric identifier assigned by Oracle Secure Backup to a volume when it was labeled. The volume ID usually includes the media family name of the volume, a dash, and a unique volume sequence number. For example, a volume ID in the RMAN-DEFAULT media family could be RMAN-DEFAULT-000002.

volume label

The first block of the first backup image on a volume. It contains the volume ID, the owner's name, the volume creation time, and other information.

volume sequence file

A file that contains a unique volume ID to assign when labeling a volume.

volume sequence number

A number recorded in the volume label that indicates the volume order in a volume set. The first volume in a set has sequence number 1. The volume ID for a volume usually includes the media family name of the volume, a dash, and a unique volume sequence number. For example, a volume ID for a volume in the RMAN-DEFAULT media family could be RMAN-DEFAULT-000002.

volume set

A group of volumes spanned by a backup image. The part of the backup image that fits on a single volume is a backup section.

volume tag

A field that is commonly used to hold the barcode identifier, also called a volume tag, for the volume. The volume tag is found in the volume label.

wallet

A password-protected encrypted file. An Oracle wallet is primarily designed to store a X.509 certificate and its associated public key/private key pair. The contents of the wallet are only available after the wallet password has been supplied, although with an obfuscated wallet no password is required.

Web tool

The browser-based GUI that enables you to configure an administrative domain, manage backup and restore operations, and browse the backup catalog.

wildcard

A wildcard is a character that can represent many other characters. For example, the asterisk symbol (*) is almost universally used to mean "any".

write date

Defines the period, starting from the volume creation time, during which updates to a volume are allowed.

write-protect

To mark a file or media so that its contents cannot be modified or deleted. To write-protect a volume, you can mount a volume read-only in Oracle Secure Backup or alter the physical media with a write-protect tab.

write window

The period for which a volume set remains open for updates, usually by appending an additional backup image. The write window opens at the volume creation time for the first volume in the set and closes after the write window period has elapsed. After the write window close time, Oracle Secure Backup does not allow further updates to the volume set until it expires (as determined by its expiration policy), or until it is relabeled, reused, unlabeled, or forcibly overwritten.

A write window is associated with a media family. All volume sets that are members of the media family remain open for updates for the same time period.

write window close time

The date and time that a volume set closes for updates. Oracle Secure Backup computes this time when it writes backup image file number 1 to the first volume in the set. If a volume set has a write window close time, then this information is located in the volume section of the volume label.

write window time

The length of time during which writing to a volume set is permitted.