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From: Winston <wbe@UBEBLOCK.psr.com.invalid>
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: zpool mirror resilvering: always all or sometimes incremental?
Date: Wed, 04 Sep 2024 22:47:32 -0400
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Suppose one has a ZFS/zpool mirror.
One of the duplicates is detached from the mirror.
At a later time, it's re-attached to the same mirror, causing
re-silvering.  Assume much of the content in the pool hasn't
changed between the detach and attach times.

Will re-silvering do some sort of incremental update, or always
copy everything?

Is the answer different for offline/online?

Just curious.  Thanks,
 -WBE