On 2010-04-01 21:02, Robert Noland wrote:
After a while I've noticed some SMART errors on ad1, so I've booted
machine
with seatools for dos and made long test. One bad sector was found and
reallocated, nothing to worry about.
As I was in seatools already, I've decided to adjust LBA size on
that disk
(seatools can do that), because it was about 30MB larger than the
other two,
and because of that I had to adjust size of freebsd-zfs partition on
that
disk to match exact size of others (otherwise 'zpool create' will
complain).
So LBA was adjusted and system rebooted.
I don't understand why you adjusted LBA. You're using GPT partitions,
so, couldn't you just make the zfs partition the same size on all
disks by adjusting it to the smallest disk, and let free space at the
end of the bigger ones ?
Well yes, I could indeed, and this is exactly what I did at the first
time (before LBA count adjusting). But while I was already using
software which could adjust LBA to make all HDD appear to be same size,
I've decided to do it to never have to remember about it while
partitioning ;) At least 'gpart show' isn't showing any unused (wasted)
space now ;) :
# gpart show
=> 34 78165293 ad0 GPT (37G)
34 128 1 freebsd-boot (64K)
162 2097152 2 freebsd-swap (1.0G)
2097314 76068013 3 freebsd-zfs (36G)
=> 34 78165293 ad1 GPT (37G)
34 128 1 freebsd-boot (64K)
162 2097152 2 freebsd-swap (1.0G)
2097314 76068013 3 freebsd-zfs (36G)
=> 34 78165293 ad2 GPT (37G)
34 128 1 freebsd-boot (64K)
162 2097152 2 freebsd-swap (1.0G)
2097314 76068013 3 freebsd-zfs (36G)
For that matter, my understanding is that ZFS just doesn't care. If
you have disks of different sized in a raidz, the pool size will be
limited by the size of the smallest device. If those devices are
replaced with larger ones, then the pool just grows to take advantage
of the additional available space.
robert.
Well, here's what man zpool says about zpool create:
"(...) The use of differently sized devices within a single raidz
or mirror group is also flagged as an error unless -f is specified."
I know I could force it, I just didn't know if I should.
After all it's just easier to type 3 times:
gpt add -t freebsd-zfs -l diskN
to use all free space on device than checking numbers on other disks and
type
gpt add -b 2097314 -s 76068013 -t freebsd-zfs -l diskN
and that's why all story begins :)
--
Bartosz Stec
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