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тАО01-07-2010 05:44 AM
тАО01-07-2010 05:44 AM
Quick question re: the EVA 4400. I have an EVA 4400 with four enclosures running single disk protection. All my VDisks are VRAID5 and I leave 2 disks worth of free space for 1 x PDM event. My disk groups are 16 disks, two per tray.
Is may data safe in the event of complete loss of an enclosure, i.e. loss of four disks from the group in one hit and is this affected by the number of disks in a group per enclosure.
I.e. would I need to go to 8 enclosures with 2 disks per enclosure to ensure resilience in the event of an enclosure failure or do the EVA's not work like that?
Many Thanks,
Tristan
Solved! Go to Solution.
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тАО01-07-2010 06:03 AM
тАО01-07-2010 06:03 AM
Re: EVA 4400 Resilience to Enclosure Failure
So even if you used 2 disks per enclosure you still would not be protected from an enclosure failure. Maybe some of the smaller LUNs would be safe if they did not use any vraid5 data blocks in the failed disks.
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тАО01-07-2010 06:45 AM
тАО01-07-2010 06:45 AM
Re: EVA 4400 Resilience to Enclosure Failure
Is the only way to achieve tray resilience to have one disk per enclosure i.e. maximum of eight disks in a disk group?
Is tray resilience something to be worried about with an EVA 4400 or do people typically run risk on it, as HP recommend as many disks as possible in the disk group?
Many Thanks
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тАО01-07-2010 06:45 AM
тАО01-07-2010 06:45 AM
Re: EVA 4400 Resilience to Enclosure Failure
The virtualization is so efficient that even a 1GByte vdisk can be striped across all 96 disk drives.
Redundancy & virtualization on the EVA is a _very complex_ matter and cannot be cut down to a hand full of rules. Even if you are protected one day the loss of a single disk drive over night can remove that protection.
If you want improved protection - replicate the data to a second EVA.
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тАО01-07-2010 07:09 AM
тАО01-07-2010 07:09 AM
Re: EVA 4400 Resilience to Enclosure Failure
Thanks Uwe, but unfortunately another EVA is out of the budget for the moment. I guess RAID 0+1 on two trays would be OK for enclosure resilience, taking into consideration the extra disk required. On the other hand, performance would be good! (or as good as 12 spindles can be)
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тАО01-07-2010 07:54 AM
тАО01-07-2010 07:54 AM
Re: EVA 4400 Resilience to Enclosure Failure
Yes. With non virtual arrays we setup the LUNs vertically on the trays using one disk (or 2 for raid6)
> Is tray resilience something...
Trays are quite resilient and they do have dual power and dual disk interfaces so they very rarely fail. And their redundant components can be replaced live if they fail.
> out of the budget for the moment
If your data uptime is extremely critical then budget should not come to play. If it does, then you have to accept the posibility of some downtime even if that possibility is extremely small.
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тАО01-07-2010 09:45 AM
тАО01-07-2010 09:45 AM
SolutionLosing two drives in the same RSS (thankfully also very unlikely) might even be be a more likely event and this is certainly worse, because you will actually lose all the data in the disk group. You would have to go to VRAID1, and/or host based shadow to multiple arrays to further reduce your chances of data loss, subject to your budget of course.
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тАО01-07-2010 09:53 AM
тАО01-07-2010 09:53 AM
Re: EVA 4400 Resilience to Enclosure Failure
Forgot to add, the nice thing about EVA (one of the many nice things!) is you can easily choose vraid level on a per vdisk basis according to your business needs. If are able to identify more and less critical storage, it might be within your current infrastructure to do this.
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тАО01-08-2010 02:12 AM
тАО01-08-2010 02:12 AM