Just leaving a note that I'm currently experiencing exactly the same on
a non-Ubuntu Debian sid system with a 2.6.18-xen kernel.
md3 : active raid1 sda6[0] sdc6[2] sdb6[1]
151091200 blocks [3/3] [UUU]
PV VG Fmt Attr PSize PFree
/dev/md3 main lvm2 a- 144.09G 35.09G
VG #PV #LV #SN Attr VSize VFree
main 1 10 0 wz--n- 144.09G 35.09G
Happens with any snapshot, as soon as I start using it. Does not happen
directly after snapshot creation. Snapshot read speed is around 2 MB/s.
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lvm snapshot on top of md raid 1 causes nearly 100% cpu usage
https://bugs.launchpad.net/bugs/113713
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