HPE EVA Storage

MSA1000, ACU, and RAID level

 
kcsmith
Occasional Visitor

MSA1000, ACU, and RAID level

I inherited the support for an MSA1000 in a remote location. I see in ACU in "more information" on the controller that RAID 6 (ADG) is enabled, and I cannot find any other location to view the RAID config. I am fine with RAID 6, but with only 14 drives in the array, I wonder where parity is stored. It appears that all 14 physical drives are configurable for logical drives/usable disk.
2 REPLIES 2
kcsmith
Occasional Visitor

Re: MSA1000, ACU, and RAID level

Is it a dynamic 3+1? The math looks that way, though nothing is explicitly labeled for use as parity.
Víctor Cespón
Honored Contributor

Re: MSA1000, ACU, and RAID level

RAID 5 stores N data segments + 1 parity, there's no dedicated drive for parity (that would be a RAID 3). The data and parity segments are spread over all drives.

RAID 6 is the same but with 2 parity segments. In your case, you'll have data in 12 disks and parity in the other 2. But the disks holding each kind of information change sequentially.

So for example, disks 1-12 data, 13&14 parity
But next data set is disks 2-12 data, 14&1 parity
and next one disks 3-14 data, 1&2 parity.