Losing multiple disks from the same RSS group

[Abdul Rashid]

Can some one please let me know if I will lose data on VRaid 1 LUNs if 2 disks fail at the same time from the same RSS group. Has anyone has expierenced this at all.

Also any idea how long a 300GB disk with 60% occupancy take to rebuild in the event of a disk failure.

Thanks

[IBaltay · Accepted solution]

hi,
there are 2 important things to be considered:
RSS
Disk protection

e.g. these threads could help you:

http://forums11.itrc.hp.com/service/forums/questionanswer.do?threadId=1323931

http://forums11.itrc.hp.com/service/forums/questionanswer.do?threadId=1111467

http://forums11.itrc.hp.com/service/forums/questionanswer.do?threadId=1076654

[Abdul Rashid]

Thanks for the info, I now know how it works

thanks

[Rob Leadbeater]

Hi,

> Can some one please let me know if I will
> lose data on VRaid 1 LUNs if 2 disks fail
> at the same time from the same RSS group.
> Has anyone has expierenced this at all.

The answer to this is - possibly. It depends on which disks fail.

I've had two disks fail simultaneously within the same RSS. Fortunately for me, the VRAID-1 LUNs survived, because the two disks that failed weren't "paired". The VRAID-5 LUNs in the group weren't so lucky...

Cheers,

Rob

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[Patrick Terlisten]

Hello,

it depends on... Principally you can lose 50% of the disks in a only with VRAID 1 filled diskgroup. But only in the case, that only one disk in a pair fails. For VRAID 5 you can theoretically lose one disk per RSS.

The time for a rebuild of a failed disk depends on the number of disks that are involved in this rebuild. A good rule of the thumb is 15 minutes for one gigabyte.

Best regards,
Patrick