Hi Corin! On 09/24/2013 11:37 AM, Corin Langosch wrote:
Hi there, do snapshots have an impact on write performance? I assume on each write all snapshots have to get updated (cow) so the more snapshots exist the worse write performance will get?
I'll be honest, I haven't tested it so I'm not sure how much impact there actually is. If you are really interested and wouldn't mind doing some testing, I would love to see the results!
Is there any way to see how much disk space a snapshot occupies? I assume because of cow snapshots start with 0 real disk usage and grow over time as the underlying object changes?
I'm not an expert here, but does rbd ls -l help? See: http://linux.die.net/man/8/rbd
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