Can we please ask a quick couple of questions regarding disk setup/allocation for our HPE 2024? The unit is not yet in production so we are able to tear down / test etc at the moment.
DISKS:
3 x 400GB SSD,
13 X 900GB 10k SAS. (One as a Hot Spare)
We were planning to have our SSD in a RAID5 disk gorup and the SAS disk in one RAID10 disk group. This would give us the speed and capacity required.
Reading the best practice white papers, it is recommended to balance the controllers with equal disk groups. If we were to create one large RAID10 group with our 12 disks and assign this to one controller, then assign the SSD RAID5 to the other controller this would be sharing the load across the controllers but they would not be equally balanced.
If we were to split our 12 x SAS drives into 2 equal disk 6disk RAID10 groups then we could balance these equally across 2 controllers but.....
a) would we then end up with 2 smaller volumes instead of one large volume?
b) would we lose IOPS as less spindles etc.?
Also what would we then do with the SSD RAID5 group, which controller would this be assigned to?
We could (if we really had to) purchase a 4th SSD and then split them into 2 disk RAID1 groups and then balance them on each controller, but again would we then end up with 2 smaller volumes.?
Can anyone please recommend which way they would go with our disk setup.
1 Controller for one big RAID10 for the 10k SAS and 1 controller assigned for the SSD?
Many thanks