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What does it mean for a partner disk to show nonzero "Used" in sysconfig -r?

I see some disks on my filers's partners showing non-zero "used" in the output of sysconfig -r. Most disks look like this:

RAID Disk   Device      HA  SHELF BAY CHAN Pool Type  RPM  Used (MB/blks)    Phys (MB/blks)

partner     1c.00.10    1c    0   10  SA:B   -  BSAS  7200 0/0               847884/1736466816
but a few have non-zero "used":

partner     1c.01.2     1c    1   2   SA:B   -  BSAS  7200 423111/866531584  847884/1736466816

On the partner, some of these disks are spares and some are in use:

spare       1c.00.10    1c    0   10  SA:A   -  BSAS  7200 847555/1735794176 847884/1736466816

data      1c.01.2     1c    1   2   SA:A   -  BSAS  7200 423111/866531584  847884/1736466816

One common characteristic is that the disks that show up with "partner" in the first col all have downsized Used vs Physical capacities listed:

partner 1b.05.101b5   10  SA:A   -  BSAS  7200 423111/866531584  2543634/5209362816
partner 1b.05.9 1b5   9   SA:A   -  BSAS  7200 423111/866531584  2543634/5209362816

etc

My guess is that the non-zero "Used" figure represents a disk that was once in use on the filer, and has been replaced, became a spare, and was reassigned to the partner, and that the "used" information is just the last known sizing information known to the filer that used to own it. Is that correct? I am assuming there will be no difficulties replacing a downsized disk with a correctly sized one, then assigning the disk, which is now a spare, to the cluster partner, where it can be used to its full capacity. Is that assumption correct? Thanks in advance -w


Re: What does it mean for a partner disk to show nonzero "Used" in sysconfig -r?

Can you share the one where you see non-zero.  We aren't talking spares (aggr status -s) are we?

Re: What does it mean for a partner disk to show nonzero "Used" in sysconfig -r?

See above:

RAID Disk   Device      HA  SHELF BAY CHAN Pool Type  RPM  Used (MB/blks)    Phys (MB/blks)

partner     1c.00.10    1c     0        10  SA:B   -  BSAS  7200 0/0                                 847884/1736466816
but a few have non-zero "used":

partner     1c.01.2     1c      1          2   SA:B   -  BSAS  7200 423111/866531584  847884/1736466816