Presnapshotcmd

This allows you to quiesce an application before the client starts the snapshot during a snapshot-based backup or archive.

This option can be used in conjunction with the postsnapshotcmd option to allow you to quiesce an application while a snapshot is created, and then to restart that application after the snapshot is started. This option is only valid if OFS or online image backup has been configured.

AIX® only: This option is only applicable to JFS2 snapshot-based file backup or archive and snapshot-based image backup. For a snapshot-based file backup or archive, use this option with the backup command, the include.fs option, or in the dsm.sys file.

Linux only: This option is only valid if the LVM is installed and configured on your system, allowing you to perform a snapshot-based image backup.

AIX and Linux only: For a snapshot-based image backup, use this option with the backup image command, the include.image option, or in the dsm.sys file.

For an online image backup, use this option with the backup image command, the include.image option, or in the dsm.opt file.

For open file support operations, use the presnapshotcmd option in an include.fs statement or in your client options file (dsm.opt).

If the presnapshotcmd fails it is assumed that the application is not in a consistent state and the client stops the operation and display the appropriate error message.

Attention: During image backup operations or snapshot differential backup operations, if the command that you include on either the presnapshotcmd or postsnapshotcmd statement starts an asynchronous process, the command might not complete before the backup operation finishes. If the command does not complete before the backup completes, temporary files might be locked, which prevents them from being deleted. A database event occurs and the following message is recorded in the dsmerror.log file:

ANS0361I DIAG: ..\..\common\db\cacheobj.cpp( 777): dbDelete(): 
 remove('C:\adsm.sys\SystemExcludeCache__24400820.TsmCacheDB'): 
  errno 13: "Permission denied".

The file that is specified in the message (cacheobj.cpp) can be manually deleted after the command that was started by the presnapshotcmd or postsnapshotcmd option completes.

Supported Clients

This option is valid for AIX JFS2 and Linux x86_64 clients only. The IBM Spectrum Protect™ API does not support this option. The server can also define this option.

This option is valid for all Windows clients. The IBM Spectrum Protect API does not support this option. The server can also define this option.

Options File

Place this option in the client system-options file (dsm.sys) within a server stanza. You can set also this option on the Image-Snapshot tab of the Preferences editor.

Place this option in the client options file (dsm.opt). You can set also this option on the Image-Snapshot tab of the Preferences editor.

Parameters

"cmdstring"

Specifies a command to process.

Use the srvprepostsnapdisabled option to prevent the IBM Spectrum Protect server administrator from running operating system commands on the client system.

If the command string contains blanks, enclose the command string in quotation marks:

   "quiesce database myDb"

If you placed quotation marks within the command string, then enclose the entire command string in single quotation marks:

   'resume database "myDb"'

"cmdstring"

Specifies the quiesce command to process.

Use a blank, or null, string for "cmdstring" if you want to prevent any commands from running that the administrator uses for presnapshotcmd. If you specify a blank or null string, it prevents the administrator from using a command on this option. If your administrator uses a blank or null string on the presnapshotcmd option, you cannot run a pre-snapshot command.

Use the srvprepostsnapdisabled option to prevent the IBM Spectrum Protect server administrator from running operating system commands on the client system.

If the command string contains blanks, enclose the command string in quotation marks:

   "quiesce database myDb"

If you placed quotation marks within the command string, then enclose the entire command string in single quotation marks:

   'resume database "myDb"'