topic Loosing Data in Operating System - HP-UX

Loosing Data

Lacrosse — Mon, 01 Aug 2005 14:37:31 GMT

This could be a VA7410 or HPUX problem not sure at this point
Has anyone seen where you loose the path through one channel on the VA7410, most eveything then fails over but sometimes we find a filesystem doesn't make it over and we have to fsck to get it back and then not all data is recovered??

HP has verified it is not a controller problem

Any ideas????

Re: Loosing Data

Florian Heigl (new acc) — Mon, 01 Aug 2005 15:18:09 GMT

are all Your alternate paths ok?

I'd start by checking every path after another by dd'ing a few Megabytes to /dev/null.

This really isn't regular behaviour :)

To avoid the data loss until the cause is found, You should take two steps.

See man scsictl and disable immediate_report for all external LUNs, and switch the common mountoption delaylog to (now, if I remembered it!) I think 'nodatainlog' - please look it up in the mount_vxfs manpage, there is an option for very syncronous I/O.

rather lose performance, not data...

Florian

Re: Loosing Data

Mohanasundaram_1 — Mon, 01 Aug 2005 15:24:04 GMT

Hi,

More data would help.

1) VA firmware version.
2) disk capacity in it.
3) Fabric switch.
4) No. of HBAs
5) OS version + patch level(specfically LVM patches and FCMS patches)
6) logprn + armdiag from VA may have more clue
7) Anything in syslog?
8) Older VA firmware used to cause some LUN hanging + corruption issues.

I would like to believe this is a VA problem.

With regards,
Mohan.

Re: Loosing Data

Sheriff Andy — Mon, 01 Aug 2005 15:31:20 GMT

At what point does the filesystem not make it over?
Is this after a delete lun, create lun? During a reboot, or during an ioscan...

What is the status like on your brocades? When you telnet in, you do a switchstatusshow, on the line where it shows SwitchState, what do you see (this depends on your fabric OS as well).

andy

Re: Loosing Data

TwoProc — Mon, 01 Aug 2005 15:34:52 GMT

Well, I hate to say it - but we had this problem a while back on our RP's that were hooked to an XP storage system. We pursued it and pursued it, and it magically went away. We figure(d) that our regular patch cycle(s) must have knocked it out eventually.
Which means, that I would suggest that you do a patch review, and try to get to the recommended patch levels if you are not there already.