I'm having trouble resizing an lvm snapshot. I do the following:
linux-util3 ~ # lvdisplay /dev/vg2/backup1
--- Logical volume ---
LV Name /dev/vg2/backup1
VG Name vg2
LV UUID qVH4Dm-OWX7-QpCL-u1rk-lnWj-PysQ-GFk0VF
LV Write Access read/write
LV Status available
# open 0
LV Size 10.00 GB
Current LE 2560
Segments 1
Allocation inherit
Read ahead sectors 0
Block device 253:0
linux-util3 ~ # lvcreate -s -L 10G -n mysnapshot1 /dev/vg2/backup1
Logical volume "mysnapshot1" created
linux-util3 ~ # lvdisplay /dev/vg2/mysnapshot1
--- Logical volume ---
LV Name /dev/vg2/mysnapshot1
VG Name vg2
LV UUID HXKS1i-JDbx-oIes-TcS6-vuud-WT7G-snJpcM
LV Write Access read/write
LV snapshot status active destination for /dev/vg2/backup1
LV Status available
# open 0
LV Size 10.00 GB
Current LE 2560
Segments 1
Snapshot chunk size 8.00 KB
Allocated to snapshot 0.00%
Allocation inherit
Read ahead sectors 0
Block device 253:16
linux-util3 ~ # lvextend -L 20G /dev/vg2/mysnapshot1
Extending logical volume mysnapshot1 to 20.00 GB
Logical volume mysnapshot1 successfully resized
linux-util3 ~ # lvdisplay /dev/vg2/mysnapshot1
--- Logical volume ---
LV Name /dev/vg2/mysnapshot1
VG Name vg2
LV UUID HXKS1i-JDbx-oIes-TcS6-vuud-WT7G-snJpcM
LV Write Access read/write
LV snapshot status active destination for /dev/vg2/backup1
LV Status available
# open 0
LV Size 10.00 GB
Current LE 2560
Segments 1
Snapshot chunk size 8.00 KB
Allocated to snapshot 0.00%
Allocation inherit
Read ahead sectors 0
Block device 253:16
linux-util3 ~ # lvscan
...snip...
ACTIVE Original '/dev/vg2/backup1' [10.00 GB] inherit
ACTIVE Snapshot '/dev/vg2/mysnapshot1' [20.00 GB] inherit
...snip...
linux-util3 ~ # lvresize -L 20G /dev/vg2/mysnapshot1
New size (5120 extents) matches existing size (5120 extents)
...snip (lvresize help)...
linux-util3 ~ #
Note that lvdisplay report 10G before and after lvextend, but lvscan
reports 20G after lvextend. The same things happens when I use the -l or
-L to resize when creating the snapshot. resize_reiserfs also refuses to
accept the 20G size, so the OS sees the block device the same way
lvdisplay does (probably a good thing).
I'm using a Xen Linux 2.6.12.6 kernel with the devicemapper built in but
dm_snapshot compiled as a module and LVM2 2.01.09 (Gentoo Linux).
Everything is AMD64.
I can successfully resize non-snpshot volumes. I can't, of course,
resize my origins, as LVM doesn't support that yet according to lvresize.
Any ideas?
Thanks
--
Adam Carheden
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