2019-12-10 16:35, Marc Branchaud wrote:
On 2019-12-10 9:18 a.m., Mark Martinec wrote:
Commenting on a thread from 2018-12 and from 2019-09-20, with my
solution
to the boot problem at the end, in case anyone is still interested.
Thank you very much for this. A couple of questions:
(1) Why do you say "raw devices for historical reasons"? Glancing
through the zpool man page and the Handbook, I see nothing
recommending or requiring GPT partitions.
Apparently using raw devices for zpool is now discouraged,
although I don't think it has ever become officially unsupported.
(2) Just to be 100% clear, my 11.3 non-root zpool looks like this:
NAME STATE READ WRITE CKSUM
storage ONLINE 0 0 0
raidz2-0 ONLINE 0 0 0
ada2 ONLINE 0 0 0
ada3 ONLINE 0 0 0
ada4 ONLINE 0 0 0
ada5 ONLINE 0 0 0
ada6 ONLINE 0 0 0
ada7 ONLINE 0 0 0
So this is using raw devices. Are you saying that if I upgrade this
machine to 12 that it won't be able to boot?
It is possible it won't boot under 12, although not necessary.
Try booting from a 12.0 (or 12.0) memory stick - it that boots,
it is probably a safe bet that it will survive an upgrade.
Of the bunch of machines that I have upgraded from 11.2 to 12,
only three failed to boot under 12.0 loader. There were a couple
of others which upgraded and booted fine even though they
had a zfs pool on raw devices. I never had a problem of
booting on hosts that had zfs pool on a gpt partition.
So it's a lottery: a few raw devices in a zpool seem to do fine,
while many raw devices in a zpool is asking for trouble
under 12.0 and later.
Mark
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