Backup problems with PV136T tape library

Ed Martin ed.martin at
Fri Mar 7 11:22:00 CST 2003

This is a long shot, but if anyone has any suggestions on how to resolve a problem we are seeing we'd very much appreciate it.  We're actively working on the issue with Dell (Gold) support, but it remains a problem after 5 days, and backup problems aren't the type we like to have!  Since we aren't sure what cause is we don't know if it's a Liux related problem or not (the back server is running Linux).

Below is a brief summary of the kit involved and the fault we are seeing.  I should add that this configuration worked OK with our previous tape library (StorageTek 9714 with 6 x DLT).  If anyone is willing to offer advice/suggestions etc then I am happy to supply more information, in as much detail as requested.  Thanks.

Is anyone successfully using a combination like this?

Problem: During backups drives go down and are not visible from Linux (mt -f /dev/st0 status).
	(usually 4 of the 6 drives go down, 2 seem to work OK, usually same drives)

Dell PowerVault 136T with 6 LTO drives
Initial Library firmware 2.88.0000
  have downgraded to 2.73.0010 (advice from Dell)
LTO drive firmware E34A
4 x Adaptec 39160
Backup Server is PE2600
Only using chan A on each card, two drives per card, library on its own card (overkill I know!)

RedHat 7.3 kernel 2.4.18-26.7.xsmp
Adaptec AIC7xxx driver version: 6.2.8
  have tried aic7xxx_old
Netbackup 4.5 (MP3)

Have tried reducing configuration to minimum spec - 1 scsi card, 1 drive.
Have tried running tar backup of local files.
Have tried replacement scsi cables.
Oh and checked the terminators!



Ed Martin
Head of Systems and Network Performance
IOP Publishing Ltd
Dirac House, Temple Back
Bristol  BS1 6BE
ddi: +44 (0)117 930 1102

Institute of Physics
Registered charity No. 293851
76 Portland Place, London, W1B 1NT, England

IOP Publishing Limited
Registered in England under Registration No 467514.
Registered Office: Dirac House, Temple Back, Bristol BS1 6BE England

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