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setting up LVS 4800 RAID 5
Hello,
I've looked everywhere for an answer to this, so I apologize if there is already an answer posted. I recently picked up a LVS 4800 and have succesfully set it up with Solaris and the JNI SBus cards. I am wanting to setup a RAID 5 but it looks like the maximum amount of disks supported per LUN is 20. Does anyone know if this is a hardware or software limitation and a possible workaround? I know there are other things I can do, such as setting up more LUNs, but just wanted to see if anyone had better results adding more drives than I have. Thanks, Bria |
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Brian McCrary wrote:
Hello, I've looked everywhere for an answer to this, so I apologize if there is already an answer posted. I recently picked up a LVS 4800 and have succesfully set it up with Solaris and the JNI SBus cards. I am wanting to setup a RAID 5 but it looks like the maximum amount of disks supported per LUN is 20. Does anyone know if this is a hardware or software limitation and a possible workaround? I know there are other things I can do, such as setting up more LUNs, but just wanted to see if anyone had better results adding more drives than I have. Thanks, Bria Its a "what makes sense" limitation. Imagine what the poor RAID controller has to do when a drive has failed in a 20-drive RAID 5. For every read that hit the failed drive, it now has to read the other 19 and recalculate from parity. Depending on its design it may have to reserve 20X the space in its cache as well. They probably assumed noone would ever use even 20. -- Jason |
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