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Oracle VM Server for SPARC 2.0 Administration Guide
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Document Information


1.  Overview of the Oracle VM Server for SPARC Software

2.  Installing and Enabling Software

3.  Security

4.  Setting Up Services and the Control Domain

5.  Setting Up Guest Domains

6.  Setting Up I/O Domains

7.  Using Virtual Disks

Introduction to Virtual Disks

Managing Virtual Disks

Add a Virtual Disk

Export a Virtual Disk Back End Multiple Times

Change Virtual Disk Options

Change the Timeout Option

Remove a Virtual Disk

Virtual Disk Identifier and Device Name

Virtual Disk Appearance

Full Disk

Single-Slice Disk

Virtual Disk Back End Options

Read-only (ro) Option

Exclusive (excl) Option

Slice (slice) Option

Virtual Disk Back End

Physical Disk or Disk LUN

Export a Physical Disk as a Virtual Disk

Physical Disk Slice

Export a Physical Disk Slice as a Virtual Disk

Export Slice 2

File and Volume

File or Volume Exported as a Full Disk

Export a File as a Full Disk

File or Volume Exported as a Single-Slice Disk

Export a ZFS Volume as a Single-Slice Disk

Exporting Volumes and Backward Compatibility

Summary of How Different Types of Back Ends Are Exported

Guidelines for Exporting Files and Disk Slices as Virtual Disks

Using the Loopback File (lofi) Driver

Directly or Indirectly Exporting a Disk Slice

Configuring Virtual Disk Multipathing

Configure Virtual Disk Multipathing

CD, DVD and ISO Images

Export a CD or DVD From the Service Domain to the Guest Domain

Export an ISO Image From the primary Domain to Install a Guest Domain

Virtual Disk Timeout

Virtual Disk and SCSI

Virtual Disk and the format(1M) Command

Using ZFS With Virtual Disks

Configuring a ZFS Pool in a Service Domain

Storing Disk Images With ZFS

Examples of Storing Disk Images With ZFS

Create a Disk Image Using a ZFS Volume

Create a Disk Image Using a ZFS File

Export the ZFS Volume

Export the ZFS File

Assign the ZFS Volume or File to a Guest Domain

Creating a Snapshot of a Disk Image

Create a Snapshot of a Disk Image

Using Clone to Provision a New Domain

Cloning a Boot Disk Image

Using Volume Managers in a Logical Domains Environment

Using Virtual Disks on Top of Volume Managers

Using Virtual Disks on Top of Solaris Volume Manager

Using Virtual Disks When VxVM Is Installed

Using Volume Managers on Top of Virtual Disks

Using ZFS on Top of Virtual Disks

Using Solaris Volume Manager on Top of Virtual Disks

Using VxVM on Top of Virtual Disks

8.  Using Virtual Networks

9.  Migrating Domains

10.  Managing Resources

11.  Managing Configurations

12.  Performing Other Administration Tasks

A.  Oracle VM Server for SPARC Physical-to-Virtual Conversion Tool

B.  Oracle VM Server for SPARC Configuration Assistant

C.  Logical Domains Manager Discovery

D.  Using the XML Interface With the Logical Domains Manager

E.  Logical Domains Manager XML Schemas



Virtual Disk Timeout

By default, if the service domain providing access to a virtual disk back end is down, all I/O from the guest domain to the corresponding virtual disk is blocked. The I/O automatically is resumed when the service domain is operational and is servicing I/O requests to the virtual disk back end.

However, there are some cases when file systems or applications might not want the I/O operation to block, but for it to fail and report an error if the service domain is down for too long. It is now possible to set a connection timeout period for each virtual disk, which can then be used to establish a connection between the virtual disk client on a guest domain and the virtual disk server on the service domain. When that timeout period is reached, any pending I/O and any new I/O will fail as long as the service domain is down and the connection between the virtual disk client and server is not reestablished.

This timeout can be set by doing one of the following:

Specify the timeout in seconds. If the timeout is set to 0, the timeout is disabled and I/O is blocked while the service domain is down (this is the default setting and behavior).

Alternatively, the timeout can be set by adding the following line to the /etc/system file on the guest domain.

set vdc:vdc_timeout=seconds

Note - If this tunable is set, it overwrites any timeout setting done using the ldm CLI. Also, the tunable sets the timeout for all virtual disks in the guest domain.