3PAR 8200 new disk enclosure installation disk allocation

[shang83]

I have 3par 8200 comes with 1 controller and 2 disk enclosure. It have 6 X 400GB SSD and 48 X 1.8TB FC drives

My management want to add 2 more enclosure with

1 enclosure 6 X 400GB SSD and 10 X 1.8TB FC drives

1 enclosure 8 X 800 SSD and 12 X 1.8TB FC drives.

With the two new enclosure disks installed, is the disk allocation and loading meet the best practices?

The current 3PAR setup is attached. 

[Sheldon Smith]

You have three cages now and will be going to five:
Distribute the SSDs across the cages in pairs as evenly as possible.
Then add the FC disks (again in pairs) in the two new cages again as evenly as possible:

2 x 400GB SSD, 16 x 1800GB FC
2 x 400GB SSD, 16 x 1800GB FC
2 x 400GB SSD, 16 x 1800GB FC
4 x 400GB SSD, 12 x 1800GB FC, 4 x 800GB SSD
2 x 400GB SSD, 10 x 1800GB FC, 6 x 800GB SSD
It should be OK, although with more SSDs on the two new cages, there will be a higher IO rate to those two cages.

Alternatively, work with 3PAR Support to move 3 pairs of the 1800GB FC from cages 0 and 1 to cages 3 and 4 so you wind up with
2 x 400GB SSD, 14 x 1800GB FC
on each cage. Then add the remaining SSDs in pairs evenly; each cage should wind up with 18 physical disks:
4 x 400GB SSD, 14 x 1800GB FC, 2 x 800GB SSD
2 x 400GB SSD, 14 x 1800GB FC, 2 x 800GB SSD
2 x 400GB SSD, 14 x 1800GB FC, 2 x 800GB SSD
2 x 400GB SSD, 14 x 1800GB FC, 2 x 800GB SSD
2 x 400GB SSD, 14 x 1800GB FC

Finally, I would recommend using pattern filters on all of the SSD CPGs so the 400GB drives are separate from the 800GB SSDs:
-p -tc_lt <number>
-p -tc_gt <number>
where <number> is midway between the total number of chunklets of the smaller and larger SSDs (say, 600).