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[dm-devel] snapshot scalability



Hi,

A co-worker recently did some tests on DM snapshots using bonnie, and
here is a rough summary of what he got as write throughput:

No Snapshots     - 373 MB/s
One Snapshots   - 55 MB/s
Two Snapshots  - 16 MB/s
Four Snapshots  - 14 MB/s
Eight Snapshots  - 6.5 MB/s

He is doing some more tests now to verify these results, but I wanted
to quickly check with the dm snapshot community. Are there any current
known scalability limits on snapshots and do the numbers mentioned here
look normal ?

Thanks and Regards,
Haripriya




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