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тАО01-14-2008 02:26 PM
тАО01-14-2008 02:26 PM
Snapshots issue
Last weekend i did backups using snapshots but something goes grong:
Stop database, mount snapshots (about 84 logical volumes. Most 42 gb) and restarts database.
First 5 filesystems got corrupted when data protector was back it up, then stop database again, mount all snapshots and restarts database.
Once backup was running the number of zombies proc reported by top grows (it reports one minute 39 zombies, next minute it was 2243). Server and backup performance seems to be degraded (backup has been running by about 18 hours, normally it takes 7 hours with 4 LTO 3 drives in 2 MSL6060 tape library).
HP-UX 11.23, OnlineJFS 3, Oracle 92, sap NW 6, overall database space about 2.8 TB...
I want to know if maybe i've missed something, command to mount snapshots:
mount -F vxfs -o snapof=/FS1 /dev/vgsnp/lvol1 /snapshot/FS1
All original filesystems are largefiles capables.
If i miss something pls ask and it will be posted.
Regards!
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тАО01-14-2008 03:12 PM
тАО01-14-2008 03:12 PM
Re: Snapshots issue
One of the things that can cause snapshots to behave badly is a bad snapshot buffer area (e.g. your /dev/vgsnp/lvol1). It's a very good idea to mirror this LVOL (or if it's an array LUN, make sure that multiple paths are available) because should the disk housing the LVOL fail that can cause the original filesystem to hang.
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тАО01-14-2008 03:20 PM
тАО01-14-2008 03:20 PM
Re: Snapshots issue
All disks are on a XP24000, RAID 5, 146 gb, 15 krpm. I think i do not need to do an explicit mirror of this vg, right (see attached)?
Maybe need to try use that disks as a raw devices?
Regards!
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тАО01-18-2008 03:43 PM
тАО01-18-2008 03:43 PM
Re: Snapshots issue
After a couple of hours work around the issue i saw that there was 5 filesystem seen like "IO error" by bdf command. Unfortunately i can├В┬┤t be able to know what causes this corruption. Clues about where to look?
Regards!
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тАО04-03-2008 05:28 PM
тАО04-03-2008 05:28 PM