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03-11-2015 07:23 AM - last edited on 03-30-2015 08:47 PM by Maiko-I
03-11-2015 07:23 AM - last edited on 03-30-2015 08:47 PM by Maiko-I
4Node P4500 constantly restriping
I have a 4 node P4500 (10.00) with 12 NR5 LUNs and 68% capacity remaining.
The LUNs are constantly restriping. It is usually 2 at a time.
What would cause this? Where can I look to troubleshoot this issue.
Thanksm
-MattGG
P.S. This thread has been moved from Storage Area Networks (SAN) (Enterprise) to HP StoreVirtual Storage / LeftHand. - HP Forum Moderator
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03-12-2015 03:33 PM
03-12-2015 03:33 PM
Re: 4Node P4500 constantly restriping
Basically, for an existing LUN, re-striping occurs when a node goes down for a while and then comes back up.
If it's been down for a while, re-striping will take longer so that the down nodes are 'caught-up'.
Otherwise, re-striping can occur when you've made changes to your LUNs -i.e. NR10 ->NR5, etc
There's no log per-se in SAN i/Q to view that would let you know why the node went down after the fact.
However, in CMC go to one of the nodes, expand to "Diagnostics->Log Files", RMC and save the "eventMan.log". Open in Notepad, search inside the file for "Event Manager Startup" and make note of the time stamp. This indicates a re-boot.
Also, search for "resyncSaniqObjects", and look for your LUN names in the vicinity.
This will let you know when your re-stripes started.
However, it would help if you give more information about your set-up:
Are they in the same site in a multi-site cluster?
Do they ever complete the re-stripe?
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03-12-2015 07:24 PM
03-12-2015 07:24 PM
Re: 4Node P4500 constantly restriping
They are in the same site.
It seems like there are always 2 restripes going on. They complete and 2 different LUNs begin to restripe. The network RAID level has not changed and no new LUNs have been added in at least a month.
Thanks,
-MattGG
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03-13-2015 05:36 AM
03-13-2015 05:36 AM
Re: 4Node P4500 constantly restriping
It would seem that one or more of your nodes has been going down or disconnected without being noticed.
It coould also be a networking issue with the downed nodes.
Again, if the re-stripes are running for long enough that you're noticing them, the main contributing factor would be loss of a node. Also, note that if the LUNs are large in size you will tend to notice them re-striping, even if the downed node was down for a few seconds.
If you can't find any clues in the above mentioned logs, I would give support a call.