Thanks Richard for explaining this. I have done a couple of tests some time ago
(you can find these in this pastebin: https://8n1.org/20024/2eb4). Results from
these tests were that even for vdevs that have newer data (and other data for
that matter) than other vdevs, it does not guarantee that
First, resilvering is done at the dataset and snapshot layer (DSL) and not
the vdev layer.
Each txg commit has a monotonically increasing counter. So the dataset
knows what data
is written when. The resilver begins temporally at the oldest common time
(as determined by the
txg commit in the vdev's
I have a
question regarding ZFS mirror resilvering. Consider a mirror with two vdevs:
disk A
and B. Disk B is hot-removed. Data is written to mirror (only written
to disk A). The host is powered off. Disk B is cold-attached to the host
and booted again. Zpool is imported. What vdev of the
