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Maximun (or suggested) hard disk numer in a raid 6

Posted on 2016-10-13
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Last Modified: 2016-12-08
Dear experts,
i've a customer with a eternus fujitsu dx 100 SAN. Actually he has a raid6 with 8 hard disk SAS 10K 600 Gb, i Should add 8 hard disk to this raid. It is an elevated number of hard disk in a single raid . Do you think that i can have some problems ? Are there some best practices about the optimal number of hard disk in a raid
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Question by:tachimiri
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by:rindi
rindi earned 166 total points (awarded by participants)
ID: 41842156
The limiting factor is what the raid controller supports, and the number of disk bays you have available. More disks in an array will normally speed up the array, as there are more spindles. On the other hand, since RAID 6 allows for 2 disk failures at the same time, maximum, chances are higher that 2 disks will fail at the same time. So you should at least take more care with monitoring the state of the array, and also have spare disks on site so you can replace a bad disk as soon as it goes bad.
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Gerald Connolly earned 168 total points (awarded by participants)
ID: 41843205
A rule-of-thumb from the past was that 7-10 disks in a RAIDset was the useable maximum even though controllers typically allow a maximum of 16-32. This relates to the fact that if a disk in RAID-5 or RAID-6 fails, all the other disks in the RAIDset need to be read for the XOR to recover the data for the missing disk.
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by:andyalder
andyalder earned 166 total points (awarded by participants)
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There's no RAID 60 option with that model so it's either RAID 6 or RAID 50, can't find any recommended maximums from Fujitsu so I'd stick to Gerald's recommendation and keep the number of disks in the RAID set at 8 meaning you would create another RAID 6 set with the new disks. This has the added benefit of allowing you to use higher capacity disks as 900GB and 1.2Tb are probably available for it.
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