[zfs-discuss] Used space on individual vdevs

Gregor Kopka zfs-discuss at kopka.net
Fri Feb 12 10:05:57 EST 2016


Dan,

unless you keep a handle on the original videos (having snapshots on the
filesystem where they are) the space occupied by them is freed on
deletion (or some TXG later, to be precise). So to your question: yes.

/zpool iostat -v/ will show you utilisation on a per vdev-basis

Gregor

Am 12.02.2016 um 15:20 schrieb Dan Hentschel via zfs-discuss:
> My 17TB raidz3 was at about 85% utilization, so I decided to add
> another vdev to the pool: an 11TB raidz3. Now the overall pool is at
> about 53% utilization, but I know that the original vdev is still at
> about 85% and the new one is close to 0%. I'm aware that a vdev
> should, ideally, be kept below 80% utilization, for performance reasons.
>
> Most of the content is video, and I am constantly re-transcoding
> several video files per day. My assumption is that, as transcoding
> takes place, the new files will be put primarily into the second vdev,
> and the old copies will be removed from the original vdev, and over
> time the pool will somewhat balance itself.
>
> Does this assumption make sense? Is there some way that I can see the
> utilization of the individual vdevs in the pool to track progress?
> It's not important. I'm just curious.
>
>  - danBhentschel
>
>
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