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[linux-lvm] problem creating lvm2 snapshot volume



Hi.

We are trying to install lvm2 volumes on our fedora core 2 (kernel 2.6.6-1.435smp)
Dell 2650 poweredge fileservers. Following the instructions at:
http://tldp.org/HOWTO/LVM-HOWTO/snapshots_backup.html
...do not work and the following error occurs:


[juhlig aragami ~]$ lvcreate -L592M -s -n dbbackup /dev/VG_aragami_1/LV_1
 device-mapper ioctl cmd 9 failed: Invalid argument
 Couldn't load device 'VG_aragami_1-dbbackup'.
 Problem reactivating origin LV_1

This error causes the LV Status to go to "suspended" and the snapshot volume cannot
be removed without rebooting the system. If anyone can help us resolve this problem
it would be greatly appreciated as we are under pressure to bring these servers on-line
ASAP.


thanks, John Uhlig

------------------------------------------
test config volume details below:
-----------------------------------------

BEFORE snapshot lvcreate.
------------------------------------
[juhlig aragami ~]$ vgdisplay
--- Volume group ---
VG Name VG_aragami_1
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 39
VG Access read/write
VG Status resizable
MAX LV 255
Cur LV 1
Open LV 0
Max PV 255
Cur PV 1
Act PV 1
VG Size 273.43 GB
PE Size 4.00 MB
Total PE 69999
Alloc PE / Size 25600 / 100.00 GB
Free PE / Size 44399 / 173.43 GB
VG UUID J7Z9Fw-oool-q9tk-Dzqy-LOwu-Hv8N-MWv6vH


[juhlig aragami ~]$ lvdisplay
--- Logical volume ---
LV Name /dev/VG_aragami_1/LV_1
VG Name VG_aragami_1
LV UUID t4Xi36-MIe2-zYIM-BN6F-gpwC-1Umr-xeMEtE
LV Write Access read/write
LV Status available
# open 0
LV Size 100.00 GB
Current LE 25600
Segments 1
Allocation next free (default)
Read ahead sectors 0
Block device 253:1
---------------------------------------
AFTER snapshot create error:
---------------------------------------
[juhlig aragami ~]$ lvdisplay
--- Logical volume ---
LV Name /dev/VG_aragami_1/LV_1
VG Name VG_aragami_1
LV UUID t4Xi36-MIe2-zYIM-BN6F-gpwC-1Umr-xeMEtE
LV Write Access read/write
LV snapshot status source of
/dev/VG_aragami_1/dbbackup [INACTIVE]
LV Status suspended
# open 0
LV Size 100.00 GB
Current LE 25600
Segments 1
Allocation next free (default)
Read ahead sectors 0
Block device 253:1
--- Logical volume ---
LV Name /dev/VG_aragami_1/dbbackup
VG Name VG_aragami_1
LV UUID vDdYvc-Kfo0-au04-n4k2-c2UY-ikSC-3CEzwv
LV Write Access read/write
LV snapshot status INACTIVE destination for /dev/VG_aragami_1/LV_1
LV Status available
# open 0
LV Size 100.00 GB
Current LE 25600
Segments 1
Snapshot chunk size 8.00 KB
Allocated to snapshot 100.00%
Allocation next free (default)
Read ahead sectors 0
Block device 253:3




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