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Re: [Linux-cluster] CLVM and Snapshots?



On Tue, 2 Aug 2005, Nate Carlson wrote:
OK, decided to try it.. here's what I get:

xen1:~# lvcreate -L 1G -s -n snaptest /dev/XenSystemDisks/iron
Error locking on node nitrogen: Internal lvm error, check syslog
Aborting. Failed to activate snapshot exception store. Remove new LV and retry.


Error on Nitrogen:

Aug 2 14:09:05 nitrogen lvm[295]: Volume group for uuid not found: doCTDCC376pE3g2JA35fNAieVNTWpAC1B3UIGOGQpn5Um5FcmPsa8yQPa0p9o9ZP

Nitrogen does not have access to the PV that this snapshot is on, which could be part of the problem.

Shut down Nitrogen and the rest of the nodes that do not have access to that PV, and get:


xen1:~# lvcreate -L 1G -s -n snaptest /dev/XenSystemDisks/iron
  Error locking on node xen2: Internal lvm error, check syslog
  Error locking on node xen1: Internal lvm error, check syslog
  Problem reactivating origin iron

xen1 dmesg:
[  491.091753] clvmd: page allocation failure. order:0, mode:0xd0
[  491.168600]  [<c013f653>] __alloc_pages+0x2b3/0x430
[  491.232788]  [<c0143379>] kmem_cache_alloc+0x69/0x70
[  491.298194]  [<c68e8044>] alloc_pl+0x34/0x60 [dm_mod]
[  491.364848]  [<c68e8185>] client_alloc_pages+0x25/0x60 [dm_mod]
[  491.442834]  [<c68e8c6d>] kcopyd_client_create+0x6d/0xc0 [dm_mod]
[  491.523111]  [<c6acc8a5>] snapshot_ctr+0x2d5/0x3b0 [dm_snapshot]
[  491.602352]  [<c68e3b59>] dm_table_add_target+0x149/0x200 [dm_mod]
[  491.683980]  [<c68e6690>] populate_table+0x90/0xf0 [dm_mod]
[  491.757601]  [<c68e6758>] table_load+0x68/0x170 [dm_mod]
[  491.827788]  [<c68e7319>] ctl_ioctl+0xf9/0x160 [dm_mod]
[  491.896622]  [<c68e66f0>] table_load+0x0/0x170 [dm_mod]
[  491.965460]  [<c016b598>] do_ioctl+0x58/0x80
[  492.021717]  [<c016b725>] vfs_ioctl+0x65/0x1e0
[  492.080366]  [<c016b907>] sys_ioctl+0x67/0x90
[  492.137764]  [<c0108ec8>] syscall_call+0x7/0xb
[  492.199824] device-mapper: Could not create kcopyd client
[  492.271951] device-mapper: error adding target to table

xen2 dmesg:
[  497.254501] clvmd: page allocation failure. order:0, mode:0xd0
[  497.331260]  [<c013f653>] __alloc_pages+0x2b3/0x430
[  497.395454]  [<c0143379>] kmem_cache_alloc+0x69/0x70
[  497.460858]  [<c68e8044>] alloc_pl+0x34/0x60 [dm_mod]
[  497.527518]  [<c68e8185>] client_alloc_pages+0x25/0x60 [dm_mod]
[  497.605612]  [<c68e8c6d>] kcopyd_client_create+0x6d/0xc0 [dm_mod]
[  497.685994]  [<c6acc8a5>] snapshot_ctr+0x2d5/0x3b0 [dm_snapshot]
[  497.765238]  [<c68e3b59>] dm_table_add_target+0x149/0x200 [dm_mod]
[  497.846871]  [<c68e6690>] populate_table+0x90/0xf0 [dm_mod]
[  497.920384]  [<c68e6758>] table_load+0x68/0x170 [dm_mod]
[  497.990365]  [<c68e7319>] ctl_ioctl+0xf9/0x160 [dm_mod]
[  498.059305]  [<c68e66f0>] table_load+0x0/0x170 [dm_mod]
[  498.128602]  [<c016b598>] do_ioctl+0x58/0x80
[  498.185030]  [<c016b725>] vfs_ioctl+0x65/0x1e0
[  498.243674]  [<c016b907>] sys_ioctl+0x67/0x90
[  498.301075]  [<c0108ec8>] syscall_call+0x7/0xb
[  498.363072] device-mapper: Could not create kcopyd client
[  498.434127] device-mapper: error adding target to table


------------------------------------------------------------------------ | nate carlson | natecars natecarlson com | http://www.natecarlson.com | | depriving some poor village of its idiot since 1981 | ------------------------------------------------------------------------


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