topic 'vol size' does not show correct size after shrink of snapmirror destination (done through source) in ONTAP Discussions

'vol size' does not show correct size after shrink of snapmirror destination (done through source)

sorenmikkelsen — Thu, 05 Jun 2025 07:34:46 GMT

Maybe this is just in the ONTAP simulator, but after shrinking source and destination volumes (the latter through a snapmirror update) the 'vol size' on destination does not show the correct size (I followed the steps in KB29832 ), e.g. after shrinking volume testvolsrc from 110MB and a successful snapmirror update, I see:

On source: vol size testvolsrc: vol size: Flexible volume 'voltestsrc' has size 100m.

On destination: vol size testvol: vol size: Flexible volume 'voltest' has size 110m.

FilerView, df etc on destination does show the correct size in destination volume 'testvol'.

Did I overlook something - has anybody of you an idea?

Kind regards,

Soren

Re: 'vol size' does not show correct size after shrink of snapmirror destination (done through source)

fletch2007 — Wed, 20 Apr 2011 18:55:06 GMT

You need to break the snapmirror and resize the destination manually, then resync the snapmirror

that is my experience - I'd like to know if there is a better way!

Re: 'vol size' does not show correct size after shrink of snapmirror destination (done through source)

shaunjurr — Sun, 24 Apr 2011 14:36:32 GMT

Hi,

This might seem counter-intuitive, but the sizes of the destination volume for volume snapmirror will always "look" the same if the destination is of equal size (+ a few MB) or larger, no matter what the actual size is. You need to use vol size -b (if I remember correctly) to get the actual size of the destination volume. You can always resize the destination volume manually, but if you go below the source volume size (or adjust the source to be larger than the destination) the mirror won't update. So if you want to adjust the test volume down a bit, then just 'vol size testvol 112m' and you're done.

Re: 'vol size' does not show correct size after shrink of snapmirror destination (done through source)

fletch2007 — Sun, 24 Apr 2011 15:50:15 GMT

Its vol status -b

Volume              Block Size (bytes) Vol Size (blocks)   FS Size (blocks)
------              ------------------ ------------------ ----------------
vol0                4096                25952256            25952256
net2                 4096                684510413           590558004
sg12                 4096                8912896             8650752
web2               4096                14417920            13107200
backup1            4096                5242880             3932160
data               4096                15204352            14417920
vm2                4096                667942912           563714458
archive            4096                418906112           402653184
65net              4096                275251200           251658240
fcappdata           4096                18350080            14417920
appdata             4096                367001600           348966093
net5                4096                216006656           183500800
backup2            4096                443862221           322122548

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