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тАО11-05-2009 07:18 AM
тАО11-05-2009 07:18 AM
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
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тАО11-05-2009 11:00 AM
тАО11-05-2009 11:00 AM
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.
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тАО11-05-2009 04:49 PM
тАО11-05-2009 04:49 PM
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.
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.
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