Offline/online a drive from a mounted RW RAIDZx pool: resilver needed?

[Freddie Cash]

If you don't write anything to the pool, or at least, nothing gets written
to that vdev, then there's
On Jul 13, 2015 4:22 PM, "Chris Stankevitz" <chris at stankevitz.com> wrote:

>
> When I offline a drive from a RW RAIDZx pool and later bring it online, do
> I have to endure a full resilver?
>
> If not, ZFS must keep track of history (sort of like subversion) so that
> it can replay missing data.  I believe the answer is "no" given my
> experience today:
>
> 1. 11 drive pool healthy (~10 TB of data)
>
> 2. I (accidentally) pull a drive from hot-swap bay
>
> 3. pool degraded
>
> 4. 30 seconds later I reinsert the drive
>
> 5. pool still degraded (disk missing)
>
> 6. 300 seconds later I issue "zpool online /dev/daX"
>
> 7. A few seconds later, pool healthy again
>
> 8. I did not notice any resilvering
>
> Chris
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