Raid 5??

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Guest

I have two identical controllers in two diferrent servers. We are seeing that 1 controller has a physical disk - Average Disk Write that is 10 time greater than the other. On of the diferrences between the RAID configuration is the number of disks that are in the RAID-- One server has 12 disks and the other has 4 disks. The server that has 12 disks is the slower of the two
My question: Is it normal that the array that has more disks has a slower disk write time than the controller that has fewer disks
Thanx in advanc

Chris
 
cheublein said:
I have two identical controllers in two diferrent servers. We are seeing
Click to expand...
that 1 controller has a physical disk - Average Disk Write that is 10 time
greater than the other. On of the diferrences between the RAID configuration
is the number of disks that are in the RAID-- One server has 12 disks and
the other has 4 disks. The server that has 12 disks is the slower of the
two.
My question: Is it normal that the array that has more disks has a slower
Click to expand...
disk write time than the controller that has fewer disks?
Thanx in advance

Chris
Click to expand...

Under RAID 5, I believe it is normal for a write to a 12-disk array to be
slower than a 4-disk array provided we are otherwise comparing apples to
apples (i.e., same host adapters, same drive make/model, same server setup,
etc.). To complete a write, all but 1 of the data chunks must make it to
disk; the last chunk can make it whenever it makes it.
 
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