On 09/19/12 02:38 AM, Sašo Kiselkov wrote:
On 09/18/2012 04:31 PM, Eugen Leitl wrote:

Can I actually have a year's worth of snapshots in
zfs without too much performance degradation?
Each additional dataset (not sure about snapshots, though) increases
boot times slightly, however, I've seen pools with several hundred
datasets without any serious issues, so yes, it is possible. Be
prepared, though, that the data volumes might be substantial (depending
on your overall data turn-around per unit time between the snapshots).

The boot overhead for many (in my case >1200) filesystems isn't as bad as it was. On our original Thumper I had to amalgamate all our user home directories into one filesystem due to slow boot. Now I have split them again to send over a slow WAN...

Large numbers of snapshots (10's of thousands) don't appear to impact boot times.


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