All,
See output of lvdisplay below...
lvm> lvdisplay
--- Logical volume ---
LV Name /dev/vg0/data
VG Name vg0
LV UUID fox8qK-dePL-xTi1-zfBO-xQzu-R5Ls-yZ5bgQ
LV Write Access read/write
LV Status available
# open 1
LV Size 200.00 GB
Current LE 51200
Segments 1
Allocation next free (default)
Read ahead sectors 0
Block device 254:0
--- Logical volume ---
LV Name /dev/vg0/home
VG Name vg0
LV UUID C748g0-PYnB-zdtB-p1Eh-kYIU-1zXN-n1yKsb
LV Write Access read/write
LV snapshot status source of
/dev/vg0/homeSnap [active]
LV Status available
# open 1
LV Size 200.00 GB
Current LE 51200
Segments 1
Allocation next free (default)
Read ahead sectors 0
Block device 254:1
--- Logical volume ---
LV Name /dev/vg0/installs
VG Name vg0
LV UUID yKoPPg-BM0J-245e-BgCZ-kj3m-DVSo-5edFbH
LV Write Access read/write
LV Status available
# open 1
LV Size 200.00 GB
Current LE 51200
Segments 1
Allocation next free (default)
Read ahead sectors 0
Block device 254:2
--- Logical volume ---
LV Name /dev/vg0/vortex
VG Name vg0
LV UUID slyYlF-tU41-rLmt-y7eC-GU41-iWD3-bsnFil
LV Write Access read/write
LV Status available
# open 1
LV Size 800.00 GB
Current LE 204800
Segments 1
Allocation next free (default)
Read ahead sectors 0
Block device 254:3
--- Logical volume ---
LV Name /dev/vg0/homeSnap
VG Name vg0
LV UUID 1eaqQh-DtCf-1FD7-iUwx-UHzR-aH0G-4X2BQv
LV Write Access read only
LV snapshot status active destination for /dev/vg0/home
LV Status available
# open 1
LV Size 200.00 GB
Current LE 51200
Segments 1
Snapshot chunk size 8.00 KB
Allocated to snapshot 0.00%
Allocation next free (default)
Read ahead sectors 0
Block device 254:10
lvm>
After creating the snapshot vg0/homeSnap, mounting it, and viewing it, everything looked fine. But a df (below) shows something is amiss. Look at the size on the homeSnap vs the size of the DATA lv. For some reason they are identical, yet the snap contains the data from the HOME lv.
debian:~# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/hda2 942M 688M 207M 77% /
/dev/hda1 46M 4.6M 39M 11% /boot
/dev/hda5 9.2G 875M 7.9G 10% /usr
/dev/hda6 1.9G 155M 1.6G 9% /var
/dev/hda7 5.4G 33M 5.1G 1% /sys_data
/dev/vg0/data 200G 32G 169G 16% /mnt/lvm/data
/dev/vg0/home 200G 102G 99G 51% /mnt/lvm/home
/dev/vg0/installs 200G 5.9G 195G 3% /mnt/lvm/installs
/dev/vg0/vortex 800G 3.2M 800G 1% /mnt/lvm/vortex
/dev/vg0/homeSnap 200G 32G 169G 16% /mnt/lvm/home-snap
I have dumped an ls of both the snap lv and the home lv and diffed them - no differences.
Why/how can df be confused?
Thanks for your help,
Christopher
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