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setting up LVS 4800 RAID 5



 
 
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  #1  
Old October 30th 03, 03:58 PM
Brian McCrary
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Default 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
  #2  
Old October 30th 03, 09:39 PM
Jason Mather
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Default

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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