you will need more than on device in your volume group. Example:
$> pvcreate /dev/sd[ab]
$> vgcreate vg /dev/sd[ab]
$> lvcreate -n lv -L 200G vg /dev/sda
$> lvcreate -s -n snap -L 20G vg/lv /dev/sdb
The cow will be located on sdb, while the origin will be located on sda.
brassow
On Aug 27, 2007, at 3:53 AM, Hannes Dorbath wrote:
Hello,
I suffer from massive I/O trashing, due to the snapshot COW area
being located on the same physical device as the origin. The
machine now has a second disk array, that I'd like to dedicate to
snapshot COW data. My problem now is that I fail to see from the
documentation how to create a snapshot, which has its COW area
located on another device. The setup currently looks like:
VG #PV #LV #SN Attr VSize VFree
data 1 1 0 wz--c- 437.62G 0
cow1 1 0 0 wz--c- 232.82G 232.82G
cow2 1 0 0 wz--c- 232.82G 232.82G
LV VG Attr LSize Origin Snap% Move Log Copy%
data data -wc-ao 437.62G
data is the LV where production data is located, and the cow1 and
cow2 VGs should be used for snapshots. Can someone give me an
example on the lvcreate syntax to archive this? I tried various
things, but end up with error messages like "Could not fine LV
<foo> in PV <bar>".
Thanks in advance.
--
Regards,
Hannes Dorbath
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