Posheng wrote:
We have 3PAR 7200 with 28x HDD.
Can I config CPG with RAID5(8+1)?
Will it make impact on performance or usable capacity?
Or I can only config CPG with RAID5(6+1)?
How many enclosures do you have? My understanding of best practice is that if you run HA Cage you want your RAID stripe to be dividable by your enclosure count (including node enclosures) if possible - IE, 3+1 on 4 enclosures, 7+1 on 8 enclosures, 4+1 on 10 enclosures ETC.
If you just have the node enclosure + 1 or 2 disk enclosure you can't run HA cage in R5.
Your limiting factor will be only 28 HDDs more than your R5 ratio. We have had pretty good luck with 7+1 as far as performance fwiw.