[linux-lvm] error creating snapshots

["Stuart D. Gathman" <stuart@bmsi.com>]

Is this a harmless error having to do with some misreported option to notify a
user process when the snapshot is almost full?  Or should I switch backups over
to network based because this means LVM might corrupt data?

CentOS-5.4

# uname -a
Linux xerces.jsconnor.com 2.6.18-164.el5xen #1 SMP Thu Sep 3 04:03:03 EDT 2009 x86_64 x86_64 x86_64 GNU/Linux
# lvcreate -s -L20G -n dmm_snap bms_data/dmm
  bms_data-dmm_snap: event registration failed: 10071:3 
libdevmapper-event-lvm2snapshot.so dlopen failed: 
/usr/lib64/liblvm2cmd.so.2.02: undefined symbol: dm_list_empty
  bms_data/snapshot0: snapshot segment monitoring function failed.
  Logical volume "dmm_snap" created
# echo $?
0
# lvremove bms_data/dmm_snap
Do you really want to remove active logical volume dmm_snap? [y/n]: y
  Logical volume "dmm_snap" successfully removed
# diff /etc/lvm/backup/bms_data /etc/lvm/archive/bms_data_00290.vg
6c6
< description = "Created *after* executing 'lvremove bms_data/dmm_snap'"
---
> description = "Created *before* executing 'lvremove bms_data/dmm_snap'"
13c13
<       seqno = 430
---
>       seqno = 429
235a236,271
> 
>               dmm_snap {
>                       id = "2KshBd-67nj-nyrX-RUKK-LEl2-ZXBP-bJrtwe"
>                       status = ["READ", "WRITE"]
>                       flags = []
>                       segment_count = 1
> 
>                       segment1 {
>                               start_extent = 0
>                               extent_count = 640      # 20 Gigabytes
> 
>                               type = "striped"
>                               stripe_count = 1        # linear
> 
>                               stripes = [
>                                       "pv0", 7648
>                               ]
>                       }
>               }
> 
>               snapshot0 {
>                       id = "zUturd-IQZR-3xYu-SgpB-NnzK-0XKL-JN3fWh"
>                       status = ["READ", "WRITE", "VISIBLE"]
>                       flags = []
>                       segment_count = 1
> 
>                       segment1 {
>                               start_extent = 0
>                               extent_count = 1280     # 40 Gigabytes
> 
>                               type = "snapshot"
>                               chunk_size = 8
>                               origin = "dmm"
>                               cow_store = "dmm_snap"
>                       }

-- 
	      Stuart D. Gathman <stuart@bmsi.com>
    Business Management Systems Inc.  Phone: 703 591-0911 Fax: 703 591-6154
"Confutatis maledictis, flammis acribus addictis" - background song for
a Microsoft sponsored "Where do you want to go from here?" commercial.