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Disk Space Calculation For HP EVA 4400

Posted on 2013-02-06
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Last Modified: 2013-02-11
I have an HP EVA 4400 with 2 disk groups
1 disk group = 24 x 400
2 disk group = 24 x450

I need to add more storage and was going to add in

12 x 450 g Disks

How much extra storage will i have if i use RAID5?
Will i have to create a new disk group 3?
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Question by:dougdog
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Expert Comment

by:wshty
ID: 38859145
in corporate environment i'd very strongly suggest that you use raid 6 instead or raid 5!

there is always the possibility of 2 drives failing (while rebuild for example) - you wouldnt want that if you could avoid it :-)


for your info:

raidcalculator:
http://www.raid-calculator.com/default.aspx
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by:dougdog
ID: 38859196
but this is different in an eva 4400
its not the rule of just loosing 1 disk
eva works different
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wshty earned 500 total points
ID: 38860001
sorry, it seems like i left my brain at home today....

1. yes you either need to create a new disk group or merge them with diskgroup 2
it is recommended that diskgroups contain only of disks the same size
also: the less diskgroups present, the better. but watch out for the RPMs on the drives.
if they differ in the RPMs then i'd suggest that you use an additional disk group

2. as for the storage capacity using vRaid5:
please refer to this neat little EVA Calculator:
http://hansdeleenheer.blogspot.de/2011/07/hp-eva-capacity-and-performance.html
 

regards
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