[Linux-cluster] CLVM and Snapshots?

[Nate Carlson]

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 at natecarlson.com | http://www.natecarlson.com |
|       depriving some poor village of its idiot since 1981            |
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