Hi All,

I was wondering what will be a better choice for a Storage Pool configuration: RAID5 - 4+1 (across 25 600GB 10K SAS drives) or RAID5 - 8+1 (across 27 600GB 10K SAS drives) on a VNX5200 block only running release 33.

RAID5 - 4+1 (across 25 600GB 10K SAS drives) will give us about 10700GB of useable space, and about 930 host IOPs.

RAID5 - 8+1 (across 27 600GB 10K SAS drives) will give us about 12800GB of useable space, and about 1010 host IOPs.

Looking at the numbers above RAID5 8+1 can seem preferred - more space, more IOPs, however if you want to expand it in the future it will cost more, as you will need to expand it by adding drives in multiples of 9.

Are there any other gotchas? What is your opinion on this?