I want to use pvmove to move some LVs in a clustered VG off some
specific PVs so those PVs can be removed.
The LVs are used for Xen VMs, running in a cluster of 4 Xen hosts. The
PVs are LUNs on a fibre channel attached SAN.
I have constructed a test environment to try out the basic theory before
moving onto more specific testing on SAN-attached hosts, however, it
seems that LVs cannot be moved unless they are deactived:
[root@clustertest01 ~]# pvmove -v -i10 /dev/xvdb
Logging initialised at Sat Feb 14 03:08:11 2009
Set umask to 0077
pvmove Wiping cache of LVM-capable devices
pvmove Finding volume group "vg00"
pvmove Archiving volume group "vg00" metadata (seqno 73).
pvmove Creating logical volume pvmove0
pvmove Moving 125 extents of logical volume vg00/lv_1
pvmove Error locking on node clustertest01.syd.nighthawkrad.net: Volume
is busy on another node
pvmove Failed to activate lv_1
pvmove Wiping internal VG cache
[root@clustertest01 ~]# lvchange -an /dev/vg00/lv_1
Logging initialised at Sat Feb 14 03:08:20 2009
Set umask to 0077
lvchange Using logical volume(s) on command line
lvchange Deactivating logical volume "lv_1"
lvchange Wiping internal VG cache
[root@clustertest01 ~]# pvmove -v -i10 /dev/xvdb
Logging initialised at Sat Feb 14 03:08:23 2009
Set umask to 0077
pvmove Wiping cache of LVM-capable devices
pvmove Finding volume group "vg00"
pvmove Archiving volume group "vg00" metadata (seqno 73).
pvmove Creating logical volume pvmove0
pvmove Moving 125 extents of logical volume vg00/lv_1
pvmove Updating volume group metadata
pvmove Creating volume group backup "/etc/lvm/backup/vg00" (seqno 74).
pvmove Checking progress every 10 seconds
pvmove /dev/xvdb: Moved: 45.6%
pvmove /dev/xvdb: Moved: 95.2%
pvmove /dev/xvdb: Moved: 100.0%
pvmove Removing temporary pvmove LV
pvmove Writing out final volume group after pvmove
pvmove Creating volume group backup "/etc/lvm/backup/vg00" (seqno 76).
pvmove Wiping internal VG cache
[root@clustertest01 ~]#
Obviously this is a less than ideal situation, as I would need to shut
down each VM on an LV I wanted to move, for the duration of the move
(doable, but I would prefer not to). I found this situation briefly
discussed earlier on the list:
https://www.redhat.com/archives/linux-lvm/2008-September/msg00062.html
https://www.redhat.com/archives/linux-lvm/2008-September/msg00063.html
Where the suggestion was made that "basic" pvmove functionality should
work on a clustered VG. Does a simple LV move count as "basic", because
I would assume it does. :)
*Should* this be working ? Is there some magic switch I need to use to
convince pvmove to work on active LVs ? I would even be happy with an
alternative that required running the pvmove on the node where the LV
was in use (ie: the Xen host running that particularly VM). None of the
LVs are actively shared between the Xen hosts (other than the occasional
live migration).
I am using CentOS 5.2, fully updated, for both my testing and production
environments. My testing environment has 3 nodes and the production has 4.
[root@clustertest01 ~]# cat /etc/redhat-release
CentOS release 5.2 (Final)
[root@clustertest01 ~]# rpm -q lvm2 lvm2-cluster cman
lvm2-2.02.32-4.el5_2.1
lvm2-cluster-2.02.32-4.el5
cman-2.0.84-2.el5_2.3
[root@clustertest01 ~]#
I also found another reply to the earlier thread, that only went to
linux-cluster:
http://www.mail-archive.com/linux-cluster@redhat.com/msg04365.html
This one seems to indicate a problem with multi-segment LVs, so I tested
that scenario as well (since some of my LVs have been extended).
[root@clustertest01 ~]# lvchange -van /dev/vg00/lv_1 /dev/vg00/lv_2
/dev/vg00/lv_3 /dev/vg00/lv_4 /dev/vg00/lv_5
Logging initialised at Sat Feb 14 03:04:35 2009
Set umask to 0077
lvchange Using logical volume(s) on command line
lvchange Deactivating logical volume "lv_1"
lvchange Deactivating logical volume "lv_2"
lvchange Deactivating logical volume "lv_3"
lvchange Deactivating logical volume "lv_4"
lvchange Deactivating logical volume "lv_5"
lvchange Wiping internal VG cache
[root@clustertest01 ~]# pvmove -v -i10 /dev/xvdb
Logging initialised at Sat Feb 14 03:04:40 2009
Set umask to 0077
pvmove Wiping cache of LVM-capable devices
pvmove Finding volume group "vg00"
pvmove Archiving volume group "vg00" metadata (seqno 48).
pvmove Creating logical volume pvmove0
pvmove Moving 50 extents of logical volume vg00/lv_1
pvmove Moving 13 extents of logical volume vg00/lv_2
pvmove Moving 13 extents of logical volume vg00/lv_3
pvmove Moving 3 extents of logical volume vg00/lv_4
pvmove Updating volume group metadata
pvmove Creating volume group backup "/etc/lvm/backup/vg00" (seqno 49).
pvmove Checking progress every 10 seconds
pvmove /dev/xvdb: Moved: 31.6%
pvmove Updating volume group metadata
pvmove Creating volume group backup "/etc/lvm/backup/vg00" (seqno 50).
pvmove Error locking on node clustertest01.syd.nighthawkrad.net:
device-mapper: reload ioctl failed: Invalid argument
pvmove Unable to reactivate logical volume "pvmove0"
pvmove ABORTING: Segment progression failed.
pvmove Removing temporary pvmove LV
pvmove Writing out final volume group after pvmove
pvmove Creating volume group backup "/etc/lvm/backup/vg00" (seqno 52).
pvmove Wiping internal VG cache
[root@clustertest01 ~]# pvmove -v -i10 /dev/xvdb
Logging initialised at Sat Feb 14 03:05:20 2009
Set umask to 0077
pvmove Wiping cache of LVM-capable devices
pvmove Finding volume group "vg00"
pvmove Archiving volume group "vg00" metadata (seqno 52).
pvmove Creating logical volume pvmove0
pvmove Moving 25 extents of logical volume vg00/lv_1
pvmove Moving 13 extents of logical volume vg00/lv_2
pvmove Moving 13 extents of logical volume vg00/lv_3
pvmove Moving 3 extents of logical volume vg00/lv_4
pvmove Updating volume group metadata
pvmove Creating volume group backup "/etc/lvm/backup/vg00" (seqno 53).
pvmove Checking progress every 10 seconds
pvmove /dev/xvdb: Moved: 46.3%
pvmove Updating volume group metadata
pvmove Creating volume group backup "/etc/lvm/backup/vg00" (seqno 54).
pvmove Error locking on node clustertest01.syd.nighthawkrad.net:
device-mapper: reload ioctl failed: Invalid argument
pvmove Unable to reactivate logical volume "pvmove0"
pvmove ABORTING: Segment progression failed.
pvmove Removing temporary pvmove LV
pvmove Writing out final volume group after pvmove
pvmove Creating volume group backup "/etc/lvm/backup/vg00" (seqno 56).
pvmove Wiping internal VG cache
[root@clustertest01 ~]# pvmove -v -i10 /dev/xvdb
Logging initialised at Sat Feb 14 03:05:47 2009
Set umask to 0077
pvmove Wiping cache of LVM-capable devices
pvmove Finding volume group "vg00"
pvmove Archiving volume group "vg00" metadata (seqno 56).
pvmove Creating logical volume pvmove0
pvmove Moving 13 extents of logical volume vg00/lv_2
pvmove Moving 13 extents of logical volume vg00/lv_3
pvmove Moving 3 extents of logical volume vg00/lv_4
pvmove Updating volume group metadata
pvmove Creating volume group backup "/etc/lvm/backup/vg00" (seqno 57).
pvmove Checking progress every 10 seconds
pvmove /dev/xvdb: Moved: 44.8%
pvmove Updating volume group metadata
pvmove Creating volume group backup "/etc/lvm/backup/vg00" (seqno 58).
pvmove Error locking on node clustertest01.syd.nighthawkrad.net:
device-mapper: reload ioctl failed: Invalid argument
pvmove Unable to reactivate logical volume "pvmove0"
pvmove ABORTING: Segment progression failed.
pvmove Removing temporary pvmove LV
pvmove Writing out final volume group after pvmove
pvmove Creating volume group backup "/etc/lvm/backup/vg00" (seqno 60).
pvmove Wiping internal VG cache
[root@clustertest01 ~]# pvmove -v -i10 /dev/xvdb
Logging initialised at Sat Feb 14 03:06:05 2009
Set umask to 0077
pvmove Wiping cache of LVM-capable devices
pvmove Finding volume group "vg00"
pvmove Archiving volume group "vg00" metadata (seqno 60).
pvmove Creating logical volume pvmove0
pvmove Moving 13 extents of logical volume vg00/lv_3
pvmove Moving 3 extents of logical volume vg00/lv_4
pvmove Updating volume group metadata
pvmove Creating volume group backup "/etc/lvm/backup/vg00" (seqno 61).
pvmove Checking progress every 10 seconds
pvmove /dev/xvdb: Moved: 81.2%
pvmove Updating volume group metadata
pvmove Creating volume group backup "/etc/lvm/backup/vg00" (seqno 62).
pvmove Error locking on node clustertest01.syd.nighthawkrad.net:
device-mapper: reload ioctl failed: Invalid argument
pvmove Unable to reactivate logical volume "pvmove0"
pvmove ABORTING: Segment progression failed.
pvmove Removing temporary pvmove LV
pvmove Writing out final volume group after pvmove
pvmove Creating volume group backup "/etc/lvm/backup/vg00" (seqno 64).
pvmove Wiping internal VG cache
[root@clustertest01 ~]# pvmove -v -i10 /dev/xvdb
Logging initialised at Sat Feb 14 03:06:21 2009
Set umask to 0077
pvmove Wiping cache of LVM-capable devices
pvmove Finding volume group "vg00"
pvmove Archiving volume group "vg00" metadata (seqno 64).
pvmove Creating logical volume pvmove0
pvmove Moving 3 extents of logical volume vg00/lv_4
pvmove Updating volume group metadata
pvmove Creating volume group backup "/etc/lvm/backup/vg00" (seqno 65).
pvmove Checking progress every 10 seconds
pvmove /dev/xvdb: Moved: 100.0%
pvmove Removing temporary pvmove LV
pvmove Writing out final volume group after pvmove
pvmove Creating volume group backup "/etc/lvm/backup/vg00" (seqno 67).
pvmove Wiping internal VG cache
[root@clustertest01 ~]# pvmove -v -i10 /dev/xvdb
Logging initialised at Sat Feb 14 03:06:37 2009
Set umask to 0077
pvmove Wiping cache of LVM-capable devices
pvmove Finding volume group "vg00"
pvmove Archiving volume group "vg00" metadata (seqno 67).
pvmove Creating logical volume pvmove0
pvmove No data to move for vg00
pvmove Wiping internal VG cache
[root@clustertest01 ~]#
It seems the 'hanging' problem is gone, but the pvmove still dies after
every segment. I can live with that, but first I need to resolve the
basic problem of even starting. :)
Cheers,
CS
--
Christopher Smith
UNIX Team Leader
Nighthawk Radiology Services
Limmatquai 4, 6th Floor
8001 Zurich, Switzerland
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