dynamic pool best practice

Question

I have Unity 650F and it shipped with 77 x 3.8 TB SSD. I would like to know whether it is the best practice to create one single dynamic pool by putting all the drives within the same dynamic pool to leverage all the SSD. Based on the white paper, the maximum number of drive per partner group is 64 so if i use the drive width of R5 12+1, I will need at least 78 drive to make up one dynamic pool. I was thinking whether it is possible for me to use R5 8+1 drive width to overcome this issue. With 8+1 I should be able to overcome this since the minimum drives to start the second partner group is 10.

DELL_ChrisHolloway · Answer

Yes with 12+1 then you once get to 64 drives, then you will need to add 12+1+1 drives in order to start the next DPG. So in your case you would need 78 drives to do that. You could create the pool with R5 8+1, that would work. You can do this by either creating the dynamic pool from UEMCLI, or what I would personally do is create the dynamic pool with 10 disks using Unisphere then add the other 68 disks to the pool. That way you will get 8+1 across the whole pool. The downside to using 8+1 is that you will get less usable capacity than when using 12+1.

wanaka · Answer

For dynamic pool, is there any drive limit? A unity 650F maximum drive is 1000 so for a single dynamic pool, are we able to support 1000. The existing document only mentioned about the limit for drive partner group is 64. There is no mention of how many partner group we can have in a dynamic pool.

wanaka · Answer

For 3.84 TB flash drive, what is the drive extend size will be created. Is that possible to know how many RAID extend will be used to create a private raid group?

Rainer_EMC · Answer

that level of detail isnt exposed