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请问MEDIA_UNMOUNT_DELAY这个参数在哪个服务器上设置？
STK L80，这是它的说法：Problem History:
There are times where NetBackup sends the MOVE MEDIUM command to the library, too soon after sending the REWIND/UNLOAD command to a drive. The library will attempt to move the cartridge back to it's home cell, before the drive has actually ejected the cartridge. The drive hasn't ejected the cartridge because the drive hasn't finished completing all the steps required in a REWIND/UNLOAD command.
The library will try to move the cartridge and find that the drive is still rewinding or trying to finish the REWIND/LOAD command. The library will post an FSC (like FSC3e24 or 3e2(x)) to it's FSC log and go on to it's next command. 'drive waiting for rewind to complete can not accept the next command yet.'
A Solution:
A library is a single SCSI command hardware component so it will not retry a failed command. Set or change Veritas's MEDIA_UNMOUNT_DELAY setting. The normal StorageTek suggestion depends on the drive type being used by the customer. StorageTek normally suggests the following:
• Ø 25-30 minutes for DLT 7, 8 and Super drives
• Ø 20-25 minutes for the 3 LTO types
• Ø 10-15 minutes for 9940
• Ø 3-6 for 9840
Background: The settings above will cause NetBackup to wait to dismount every tape in every drive for the allotted parameter settings. This setting is only useful on cartridges were the data is covering half to almost all of the tape. Always suggest that the parameter settings be played with to match the customer's environment, to lessen any degradation to the backup window.
The following is the excerpt from the Veritas NetBackup's Administrator Guide, explaining the MEDIA_ UNMOUNT_ DELAY parameter:"MEDIA_UNMOUNT_DELAY" (from Veritas Netbackup 3.4 Admin Guide - page 337)
Applies only to user operations (including backups and restores of database-extension clients, such as those running NetBackup for Oracle). When you specify MEDIA_UNMOUNT_DELAY, the media unload is delayed for the specified number of seconds after the requested operation has completed. This delay reduces unnecessary media unmounts and media positioning in cases where the media is requested again a short time later.
The delay can range from 0 to 1800 seconds (the default is 180 seconds (3 minutes) ). If you specify 0, the media unmount occurs immediately upon completion of the requested operation. The maximum delay is 1800 seconds. Values greater than 1800 are set to 1800. You can add this option to the /usr/openv/netbackup/bp.conf file on NetBackup servers."
我现在不知道是否需要在MEDIA SERVER上设置这些参数。 |
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发表于 2005-07-20 08:53
