On my two OmniOS backup servers (around 30TB each) I hold regularly around 10k snapshots, regular data snaps and snaps from replications with a longterm retention policy without any problem. I would not expect performance problems due number of snaps beside the delay when you list them. I would not expect any storage/filer performance problems beside problems that are related to the pool fillrate. A nearly full pool is slow does not matter the number of snaps. Only running replications may affect storage performance as they produce load.

Gea


Am 22.03.2017 um 18:43 schrieb Mark Creamer:
I have a lot of snapshots. I used to periodically do a zfs send/receive to another box (omniOS) and store the critical data there, deleting the unnecessary parts that were created in the send/receive. But that got too much for the backup network to handle, so I just have the snapshots. Is there a practical limit to what is stored as snapshots on a host before it affects performance? I just wonder if it's a better strategy to only store maybe a week or month's worth of daily snaps per VM and the rest move the files to a different location. Or do previous snapshots not affect the running VMs at all?

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Thanks,
Mark
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