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RAID5 and overhead

By andrews ·
This is actually a 2 phase question. What is the maximum number of drives that can be added to a RAID5 solution?

How much speed increase/decrease will be seen in terms of read/write when going from 4 drives in the RAID5 to say 10 drives?

And lastly, what would be the cutoff point for your raid scsi solution before switching over to a fiber solution?

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RAID5 and overhead

by Fnugry In reply to RAID5 and overhead

1. Number of disks you can place in an RAID5 array depends on the h/w you use (number of SCSI channels, number of drives supported by your RAID controller, number of disk bays in the server, etc.) For example, a typical 4-channel RAID controller allows up to 48 disks to be combined in a RAID5 or RAID50 array.
2. Data blocks in RAID5's are not duplicated, so there is no change in performance when you increase number of disks in the array.
3. A need to access array located in a different building directly would be the main one.

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