ISeries 810 drive size difference

Tags:
AS/400
Hardware
On an ISeries 810 why would the six drives show up in Work with Disk Status show up as different sizes, 2 @ 35165 and 4 @ 26373?

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Could the 2@35 be mirrored load source and the four in a parity array that is balanced?

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  • Fushigi
    Do a WRKDSKSTS and press F11. You'll see either 2 drives with a protection type of MRR + 4 with DPY or all 6 will show DPY. If 2 are MRR then you have 2 mirrored drives + 4 in a RAID5 parity set. If all 6 are DPY then it's just 1 RAID5 set with 6 drives. The differing capacities would be because the space for RAID parity uses either 2, 4, or 8 drives depending on the number of drives in the set. A 3 drive set uses 2 drives for parity. 4-7 drives uses 4 drives, 8+ drive in a set uses 8 drives for parity. If the protection type is '.' then the drives aren't even mirrored and you are at risk of an outage should a drive failure occur. Also handy on this screen is the status - they should all say Active. If not, then a problem with the disk system might exist.
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