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I'm doing various P9 SSD configuration options.
One Config is using the CEC with the integrated SAS RAID controller.
What is the amount of cache on the integrated SAS RAID controller?
I'm not finding this anywhere.
Second Config is using an EXP24XS with dual EJ14 - PCIe3 12 GB Cache Raid Plus SAS Adapter Quad-port
1) Are number of arms still important?.
One config using a smaller SSD, more arms, no room for growth.
Second config using a larger SSD, less arms, room for growth.
2) Did Raid-5 parity set rules remain the same on P9?
One config using 1-Raid5 parity set, no hot spare.
Second config using 2-Raid5 parity sets, no hot spare.
From help text
All the disk units in a parity set must be the same capacity
with a minimum number of either 3 or 4 units, and a maximum
number up to 18 units (depending upon the type of adapter)
in the resulting parity set.
Also, from a performance standpoint, are 2 or 3 raid sets better than 1?
Select parity optimization
1. Availability
2. Balance
3. Capacity
4. Performance
Thank You
_____
Paul Steinmetz
IBM i Systems Administrator
Pencor Services, Inc.
462 Delaware Ave
Palmerton Pa 18071
610-826-9117 work
610-826-9188 fax
610-349-0913 cell
610-377-6012 home
psteinmetz@xxxxxxxxxx
http://www.pencor.com/
midrange.com
