Mode sense taking a long time > 40 seconds in Robtest
Updated: 21 May 2010 | 3 comments
Hi all,
need some idea's on how to track down the cause of my Netbackup issues. I am running Solaris 10 X86 and NB 6.5.3, Spectralogic library. Currently only have the master seeing 2 drives, and robotic control on drive 1 lun 1. I've been trying to track down some slowness and scsi timeouts. I find that when I run robtest, mode sense takes greater than 40 seconds to come back and allow me to see drives/slots etc. I am thinking that the issue is with either the HBA used to talk to the drive or somewhere along the path. Any help would be appreciated.
thanks,
D
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Things to tick/check: 1) Your
Things to tick/check:
1) Your hardware is supported in the NetBackup latest HCL.
2) In addition firmware levels/revisions checked. Release notes may reveal known issues you experiencing.
Just like this technote reveals:
http://seer.entsupport.symantec.com/docs/270136.htm
3) OS/Hardware drivers up to date
4) If a SAN, verify your zoning.
Does the netbackup 'sgscan' command work OK at reporting device discovered.
http://seer.entsupport.symantec.com/docs/291443.htm
Tip: Get overview/document your NBU environment. Run 'nbsu' and review the output.
• If this provides help, please vote or mark appropriate solution.
IOSTAT & Kstat
Check performance is something complicated, but a solaris haves a bunch of nice tools who can help you to troubleshoot this, just like iostat -exnDl st1, where st1 is the tape drive address, with this you can see at OS level what the speed of the drive is between OS and drive, if robtest takes too long to respond check the library firmware version, probably the issue is with the library and not with NBU or Solaris.
Omar A Villa
Netbackup Expert
These are my personal views and not those of the company I work for
SCSI
If you use SCSI HBA make sure you:
You can also swap around cables/terminators to see if the problem follow a pattern.
Assumption is the mother of all mess ups.
If this post solved you’re questions please send a gratitude by marking it as a solution.
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