Date: Wed, 1 Apr 2015 00:30:46 -0400 (EDT) From: Daniel Eischen <deischen@freebsd.org> To: freebsd-stable@freebsd.org Subject: Trying to clone a ZFS drive, can't get ashift=12 Message-ID: <Pine.GSO.4.64.1504010016170.26089@sea.ntplx.net>
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I have an Oracle (nee Sun) X4-2 server with identical 300GB SAS
drives. I did an MBR ZFS install from FreeBSD 10.1-RELEASE CD
and have it updated to p6:
$ uname -a
FreeBSD foo 10.1-RELEASE-p6 FreeBSD 10.1-RELEASE-p6 #0:
Tue Feb 24 19:00:21 UTC 2015
root@amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC
amd64
$ freebsd-version
10.1-RELEASE-p6
The current ZFS setup is:
$ zdb | grep ashift
ashift: 12
ashift: 12
$ zpool status
pool: bootpool
state: ONLINE
scan: resilvered 486M in 0h0m with 0 errors on Thu Mar 26 09:16:45 2015
config:
NAME STATE READ WRITE CKSUM
bootpool ONLINE 0 0 0
diskid/DISK-001442CBEEKF%20%20%20%20%20%20%20%20KFHBEEKFs1a ONLINE 0 0 0
pool: zroot
state: ONLINE
scan: resilvered 200K in 0h0m with 0 errors on Wed Mar 25 10:51:36 2015
config:
NAME STATE READ WRITE CKSUM
zroot ONLINE 0 0 0
diskid/DISK-001442CBEEKF%20%20%20%20%20%20%20%20KFHBEEKFs1d ONLINE 0 0 0
$ gpart show diskid/DISK-001442CBEEKF%20%20%20%20%20%20%20%20KFHBEEKF
=> 63 585937437 diskid/DISK-001442CBEEKF%20%20%20%20%20%20%20%20KFHBEEKF MBR (279G)
63 585937422 1 freebsd [active] (279G)
585937485 15 - free - (7.5K)
$ gpart show diskid/DISK-001442CBEEKF%20%20%20%20%20%20%20%20KFHBEEKFs1
=> 0 585937422 diskid/DISK-001442CBEEKF%20%20%20%20%20%20%20%20KFHBEEKFs1 BSD (279G)
0 4194304 1 freebsd-zfs (2.0G)
4194304 8388608 2 freebsd-swap (4.0G)
12582912 573354510 4 freebsd-zfs (273G)
[Why are the disk ids blank %20 filled?]
Now I want to create another (sorta) matching setup, but this time want
to use labels and 4G (instead of 2G) for bootpool.
# gpart create -s MBR da1
# gpart add -t freebsd da1
# gpart create -s BSD da1s1
# gpart add -s 4G -t freebsd-zfs da1s1
# gpart add -s 4G -t freebsd-swap da1s1
# gpart add -t freebsd-zfs da1s1
# gpart show da1
=> 63 585937437 da1 MBR (279G)
63 585937422 1 freebsd (279G)
585937485 15 - free - (7.5K)
# gpart show da1s1
=> 0 585937422 da1s1 BSD (279G)
0 8388608 1 freebsd-zfs (4.0G)
8388608 8388608 2 freebsd-swap (4.0G)
16777216 569160206 4 freebsd-zfs (271G)
Except for da1s1a being 4G instead of 2G, everything matches the
ZFS setup above. Make the labels.
# glabel label boot0 da1s1a
# glabel label swap0 da1s1b
# glabel label root0 da1s1d
Create the ZFS bootpool.
# zpool create -o cachefile=/tmp/newpool.cache bootpoolNew label/boot0
# zdb -U /tmp/newpool.cache | grep ashift
ashift: 9
The geometry matches, but ashift is 9 not 12.
If I try to use 4K, the disk geometry doesn't match the original and
ashift is still 9 instead of 12.
# gpart create -s MBR da1
# gpart add -a 4k -t freebsd da1
# gpart create -s BSD da1s1
# gpart add -a 4k -s 4G -t freebsd-zfs da1s1
# gpart add -a 4k -s 4G -t freebsd-swap da1s1
# gpart add -a 4k -t freebsd-zfs da1s1
# gpart show da1
=> 63 585937437 da1 MBR (279G)
63 63 - free - (32K)
126 585937359 1 freebsd [active] (279G)
585937485 15 - free - (7.5K)
# gpart show da1s1
=> 0 585937359 da1s1 BSD (279G)
0 2 - free - (1.0K)
2 8388608 1 freebsd-zfs (4.0G)
8388610 8388608 2 freebsd-swap (4.0G)
16777218 569160136 4 freebsd-zfs (271G)
585937354 5 - free - (2.5K)
# zpool create -o cachefile=/tmp/newpool.cache bootpoolNew label/boot0
# zdb -U /tmp/newpool.cache | grep ashift
ashift: 9
What gives? How do I get it to use 4k?
--
DE
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