On Wed, 10 Dec 2014 19:15:05 -0600, Phillip Susi <psusi@ubuntu.com> wrote:
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On 12/08/2014 03:59 PM, Jason Warr wrote:
I may have missed part of the discussion but in order to fully
understand what is going on I'd like to know what arguments you
used when you issued the "lvconvert --splitmirrors" command. There
are several options to it that can influence what happens to the
mirror members.
The exact sequence of commands was:
lvconvert --type raid1 -m 1 faldara/utopic /dev/sdb1
lvconvert --splitmirrors 1 --trackchanges faldara/utopic --name
utopic-backup /dev/md0
It ignores the name because what it does with "--trackchanges" is rename
the mirror leg to a visible & read only version of the meta. Sample:
[5:root@goldmember /etc/sysconfig/network-scripts]# lvs -a -o
lv_name,lv_attr,lv_dm_path,devices,copy_per
LV Attr DMPath
Devices
test01LV rwi-aor--- /dev/mapper/test01VG-test01LV
test01LV_rimage_0(0),test01LV_rim
[test01LV_rimage_0] Iwi-aor--- /dev/mapper/test01VG-test01LV_rimage_0
/dev/sdas(12802)
[test01LV_rimage_1] Iwi-aor--- /dev/mapper/test01VG-test01LV_rimage_1
/dev/sdar(12802)
[test01LV_rmeta_0] ewi-aor--- /dev/mapper/test01VG-test01LV_rmeta_0
/dev/sdau(0)
[test01LV_rmeta_1] ewi-aor--- /dev/mapper/test01VG-test01LV_rmeta_1
/dev/sdat(0)
Would be like so after:
[5:root@goldmember /etc/sysconfig/network-scripts]# lvs -a -o
lv_name,lv_attr,lv_dm_path,devices,copy_per
LV Attr DMPath
Devices
test01LV rwi-aor--- /dev/mapper/test01VG-test01LV
test01LV_rimage_0(0),test01LV_rim
test01LV_rimage_0 Iri-a-r--- /dev/mapper/test01VG-test01LV_rimage_0
/dev/sdar(1)
[test01LV_rimage_1] iwi-aor--- /dev/mapper/test01VG-test01LV_rimage_1
/dev/sdas(12802)
[test01LV_rmeta_0] ewi-a-r--- /dev/mapper/test01VG-test01LV_rmeta_0
/dev/sdar(0)
[test01LV_rmeta_1] ewi-aor--- /dev/mapper/test01VG-test01LV_rmeta_1
/dev/sdas(12801)
lvconvert --splitmirrors 1 --trackchanges faldara/utopic --name
utopic-backup /dev/md0
The idea was to start using the new drive exclusively while keeping a
backup on the old drive.
Also I thought it was a bit odd that --splitmirrors accepted the
- --name argument, but silently ignored it, instead using an internal
auto generated name.
You can't track changes and rename the "backup" leg at the same time. If
you wanted to keep the backup leg after making sure the in use one was
good you would need to issue a new "--splitmirror"
command with a new volume name and *no* "--trackchanges" option.
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