Asset ID:	1-72-1012097.1
Update Date:	2011-03-22
Keywords:

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Solution Type  Problem Resolution Sure

Solution  1012097.1 :   Sun StorEdge[TM] Enterprise NetBackUp software:Symptom:Downs a drive on dismount and an FSC 3E24 is logged in the Sun StorEdge[TM] L700/L180 log  


PreviouslyPublishedAs
216644

Applies to:

Sun StorageTek 9840B Tape Drive
Sun StorageTek 9940B Tape Drive
Sun StorageTek L180 Tape Library
Sun StorageTek L700 Tape Library
Veritas NetBackup (NBU) Software - Version: 3.0 and later    [Release: 3.0 and later]
All Platforms
Checked for relevance on 22-Mar-2011.

Symptoms

There are times when Sun StorEdge[TM] Enterprise NetBackup software, sends the MOVE MEDIUM command to a tape library, too soon after sending the REWIND/UNLOAD command to a drive. The library will attempt to move thetape cartridge back to its home cell, before the drive has actually ejected the cartridge. The drive has not ejected the cartridge, because it hasn't completed all the steps required, in a REWIND/UNLOAD operation.

The library will try to move the cartridge, and find that the drive is still rewinding. The library will post an FSC (FSC3E24 or 3E2(x)) to it's FSC log and go on to it's next command.

The end result is, that the drive is downed by the Sun StorEdge Enterprise NetBackUp software, and the tape cartridge is left in the drive, ready to be dismounted.

Changes

{CHANGE}

Cause

{CAUSE}

Solution

Resolution

Set, or change the MEDIA_UNMOUNT_DELAY setting, in the following file, based on the criteria list below :

   /usr/openv/netbackup/bin/bp.conf   

25-30 minutes for DLT 7000, DLT8000 and SuperDLT
20-25 minutes for the LTO
10-15 minutes for 9940
3-6 minutes for 9840

A setting of 20 minutes(represented in seconds), would appear like this in the bp.conf file:

   MEDIA_UNMOUNT_DELAY = 1200

This needs to be set on all media servers

Additional Information

Note: If there is no entry in the bp.conf file for MEDIA_UNMOUNT_DELAY, the default setting of 180 seconds will apply. As shown, this is not adequate for most drives in the Sun StorEdge L180 and L700 tape libraries.

Product
VERITAS NetBackup 5.0
VERITAS NetBackup 4.5
VERITAS NetBackup 3.4
Sun StorageTek 9940 Tape Drive
Sun StorageTek 9840B Tape Drive
Sun StorageTek L180 Tape Library
Sun StorageTek LTO FC for L700/L180
Sun StorageTek L700 Tape Library


Some of this information has been extracted from an STK Technical Tip, and is not intended to be @distributed in its entirety, to a customer.
The documented description of MEDIA_UNMOUNT_DELAY from Veritas, does not support the @behavior documented in this SRDB, but the solution has been confirmed by STK and I have talked with @several backline TSE's at Veritas who agree that it does provide relief. There is no guarantee that this @behavior (and relief) will persist in future NetBackup releases.

NOTE added March 22,2005 by John Howard:

While this SRDB may still provide relief in some circumstances, it has come to my attention that Veritas @now believes that as of NBU 5.x MEDIA_UNMOUNT_DELAY tuning, will not provide any relief from @FSC 3E2x on STK L700 and L180 robots.
3e24, MEDIA_UNMOUNT_DELAY, down, downed, L700, L180, 3e2
Previously Published As  74280


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