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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