2018-01-19 12:30 AM
we have FAS2554 with 48x 6Tb drives deployed with Advanced Drive Partitioning enabled. 24 drives per each controller
I want to create 2 data aggreagtes one per controller.
I know that I can create aggreagte from 12 normal drives (5.35Tb) and then add the drives from data partition ( 5.3Tb) but they would need to be in different raid group and we will loose additional 3 drives ( raid tec)
Is there any option to create that data aggregate and have all drives in one raid group to not loose additional drives for next parity?
Solved! SEE THE SOLUTION
2018-01-21 08:02 PM
For drives with a 6TB or larger marketing capacity, maximum RAID-DP raidgroup size is 14, so with 24 disks, you need to go to 2 raidgroups.
Fortunately, with ONTAP 9.1 and later, you can use RAID-TEC, with triple parity.
My suggestion would be to upgrade to 9.1, then use the internal ADP drives to create a single aggregate with a single RAID-TEC raidgroup of 23 disks (with 1 spare, or 24 without) for ~95TB usable, and then on the other controller, use the external drives in the same sort of configuration - single aggr single RAID-TEC raidgroup with ~96TB usable.
Hope this helps!
2018-01-25 06:21 AM
thanks for your reply I will keep that in mind for future deployments.
Right now I couldn't destroy both aggregates at one time due to having some data on them. So I had to move volumes from one aggregate to another to be able to destroy one.
Actually now I have created data aggreagte with ADP disk drives and then I extended that aggregate with external disks. I lost 50g from every external drive beacuse they have scaled to the ADP drives but with this configuration I can have RAID-TEC data aggregate with only one raid group (size 22 and 2 spares) and I am not losing 3 drives for next raid group parity