Post #2898067
2026-05-09 06:33 UTC
Detail, for posterity:
2 x 8TB drives
2 x 4TB drives
therefore:
partition all drives with a 4TB partition
partition the 8TB drives with a second 4TB partition
zpool create migration \
raidz1 /dev/sd[cdef]1 \
mirror /dev/sd[ef]2
This pool only exists to get data out of the existing (mdadm) NAS; once data is transferred, the 4x8TB drives from the QNAP will be moved into the TrueNAS array, a new RAIDZ1 zpool created, and the data copied from the migration zpool into it; and then the 2 x 8TB drives added to the new zpool to expand it, and probably the 2 x 4TB drives set up in a separate mirrored zpool specifically for backups or something.
Replies (1)
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@jpm@aus.social 2026-05-09 08:58
@nonspecialist@aus.social avoid adding drives to a zpool later if you can. ZFS always writes data to the vdev with the most free space, so every single write will go to the new drive(s) until the free space balances across all the drives.