request - Creates a removable-media file
request
[-f file_id]
[-g group]
[-i information]
-m media
[-N]
[-n version]
[-o owner]
[-p position1[∕position2∕position3∕ …]]
[-s size]
[-v vsn1[∕vsn2∕vsn3∕ …]]
file
request
[-f file_id]
[-g group]
[-i information]
[-l vsnfile]
-m media
[-N]
[-n version]
[-o owner]
[-s size]
file
SUNWsamfs
The request command creates a removable-media file, which is a file that resides only on one or more removable media cartridges. Such a file does not reside in online magnetic disk storage. Removable media files allow you to read data from tape or magneto-optical cartridges directly to memory. Creating removable media files allows you to use cartridges in an automated library without having them under the control of Oracle HSM. In addition, removable media files can also be used for disaster recovery purposes.
A removable media file can be written to more than one volume if the file is large. This creates a volume overflow file.
The -m media option to this command specifies the
media type and is a required option.
The Volume Serial Name (VSN) for the removable media file specifies the cartridges to which the removable media file will be written. The VSNs can be specified in one of two ways:
By specifying the -v vsn option.
If you specify the VSN using this option, you can also use
the -p option to supply
the position of the removable media file on the media. You must be
superuser to specify the -p option.
By specifying the -l vsnfile option.
Note that you cannot specify both the -v option and
the -l option on the same request command line.
When an application writes to a removable media file by using the
open (2) system call with the oflag argument set
to O_WRONLY, O_RDWR, O_CREAT, or O_TRUNC,
the Oracle HSM file system is updated to reflect the data's position
on the cartridge. Subsequent
read access using the open (2) call with oflag
set to O_RDONLY results
in a read of the data written during creation.
This command accepts several options. In the following list, the options are grouped according to function.
The following general options can be used for any type of removable-media cartridge:
-l vsnfileSpecifies the name of the file that contains the list of VSNs.
Within a vsnfile, VSNs must be specified one per line. Each line must contain a VSN name. The vsn cannot be more than 6 characters in length for a tape or 31 characters in length for magneto-optical media.
You can also specify the position within the vsnfile.
If specifying the position,
begin each line with the VSN name, followed by a space character,
and followed by a decimal or hexadecimal number that indicates
the position on the medium. If specifying in hexadecimal, precede
the position indicator by Ox characters.
Each VSN in the vsnfile must reside in a local automated library.
This option cannot be specified in conjunction with the -v option.
-m mediaSpecifies the media type. For media, specify a media type
as described on the mcf (4) man page. This is a required
option.
-p position1[∕position2∕position3∕ …]A number that specifies the position of the removable media file
on the cartridge.
This option must be specified in conjunction with the -v option.
The number of positions specified must match the number
of vsns specified on the -v option.
The position can be
specified in decimal or hexadecimal. To specify hexadecimal, precede
the position with 0x.
If specified, the media is positioned to position on each VSN.
The number of positions specified must match the number of VSNs.
Note that Oracle HSM utilities usually print the position of the file on the medium in hexadecimal. You must be superuser to specify a position.
-s sizeSpecifies the required size in bytes. When file is opened for write access, sufficient space on the media must be available before the first write is done.
-v vsn1[∕vsn2∕vsn3∕ …]Specifies one or more VSNs to which the removable media will be written. The vsn cannot be more than 6 characters in length for a tape or 31 characters in length for magneto-optical media.
If more than one VSN is specified,
separate them with slash characters (∕).
If you want to specify the position on the media, use
the -p position argument in conjunction with this argument.
Each vsn specified must reside in a local automated library.
This option cannot be specified in conjunction with the -l option.
Specifies the name of the file to be written to removable media. This can be a full path name. The file must reside in an Oracle HSM file system. After the removable-media file is created, subsequent access to the file results in access to the specified removable-media cartridge.
For tape files, each write to the media results in one tape block. Each read of the media returns either a tape block or the first buffer-size bytes of the tape block, whichever is smaller. The buffer size must be equal to or larger than the tape block in order to read the entire block.
The following option can be used only if the removable media file is being written to tape media:
-NSpecifies that the media is a foreign tape. That is, the tape was not written in a Oracle HSM environment. The tape must be barcoded, write protected, opened for read access only, and positioned to 0.
The following options can be used only if the removable media file is being written to magneto-optical media:
-f file_idSpecifies the recorded file name of the file
to access (up to 31 characters).
The default is the file name portion (basename) of the path specified
by file. For requests in which file is greater than
31 characters, no default exists, and the -f argument is required.
-n versionVersion number of the file. If version is 0, the most current version is used for read access, and a new version is created for write access. The default value is 0. For write access, the file is updated with the new version number.
-o ownerSpecifies the owner. Can be up to 31 characters.
The default is the current user.
For magneto-optical disk files that are to be used to read
archive images, the owner specification must be -o sam_archive.
-g groupSpecifies the group identifier. Can be up to 31 characters.
The default is the user's current group.
For magneto-optical disk files that are to be used to read
archive images, the group specification must be -g sam_archive.
-i informationSpecified a user information string. The information string is written in the file's label at creation time. Can be up to 159 characters.
Example 1.
This example command is used to recover data from
a tape-resident archive file at position 286 hexadecimal
on DLT volume YYY:
request -m lt -v YYY -p 0x286 ∕sam1∕xxx
Example 2. This example command shows how to specify multiple VSNs:
request -m lt -v YYY∕VVV∕WWW -p 0x286∕0x3f07∕0x0x4 ∕sam1∕xox
Example 3. This example has the same effect as the command line
in Example 2, but it uses the -l option:
request -m lt -l vsns ∕sam1∕xox
File vsns is as follows:
YYY 0x286 VVV 0x3f07 WWW 0x0x4
Removable-media files are not supported over NFS.
