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тАО01-06-2011 08:22 AM
тАО01-06-2011 08:22 AM
We have an EVA4400 with 60 disk drives. Does anyone know how data is protected with parity groups among the drives?
-inex
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тАО01-06-2011 09:44 AM - last edited on тАО11-10-2011 01:51 PM by Kevin_Paul
тАО01-06-2011 09:44 AM - last edited on тАО11-10-2011 01:51 PM by Kevin_Paul
SolutionHi Inex,
that depends on the raid level that you have configured on this BOX
Check this if u find some info here.
http://h30499.www3.hp.com/t5/Storage-Area-Networks-SAN/EVA4400-performance-documentation/m-p/4712341#M46805
else provide your raid configuration so that we can advice you.
thanks,
Aftab
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тАО01-06-2011 10:55 AM - last edited on тАО11-10-2011 01:51 PM by Kevin_Paul
тАО01-06-2011 10:55 AM - last edited on тАО11-10-2011 01:51 PM by Kevin_Paul
Re: EVA 4400 parity groups
Hey,
The subgrouping of disk drives in an EVA is called "RSS" - this is a feature that happens in the background and you have no direct control of it.
Read up on "RSS" - redundant storage set. That is how the EVA is grouping the disks internally.
HP recommends having the amount of disks divisible by 8 for best practices.
This link will give you some more information as well:
http://h30499.www3.hp.com/t5/Disk-Array/EVA-RSS-calculation/m-p/4665686#M35544
Basically if you have one disk group of the 60 disks and you have a vraid5 disk in there. Then you can lose one disk in each RSS before the vraid5 is gone.
If you have a vraid1 in there you can if you are lucky/unlucky lose half of the disks.
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тАО01-06-2011 11:21 AM
тАО01-06-2011 11:21 AM
Re: EVA 4400 parity groups
-inex
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тАО01-06-2011 11:55 AM
тАО01-06-2011 11:55 AM
Re: EVA 4400 parity groups
Capture it by going to server options -> capture system information -> select "controller configuration dump".
It's in .xml format so it's a little hard to read but it is in there somewhere :)
It might be possible to get it via SSSU but I don't know how. HP took it away from CV because people asked too much about it :)
Optimal for you would be something like this: 8+8+8+8+8+8+6+6
But it depends in what order you put them in etc.
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тАО01-06-2011 09:40 PM
тАО01-06-2011 09:40 PM
Re: EVA 4400 parity groups
Hari
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