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

Hello,

You are using lvm2, and you should read in that howto, that lvm2 does not support snapshots yet. Sorry about that.

Regards,
Dimitar

"The only thing necessary for the triumph of evil is for good men to do nothing."
                                                  --Edmund Burke.