Re: Make ZFS auto-destroy snapshots when the out of space?

On May 30, 2010, at 10:35 PM, David Magda wrote:

> An event framework would certainly be helpful in a general sense =
(Linux has event(3) AFAIK), and that could certainly be useful for =
purging snapshots during resource constrained situations. But even if we =
don't have it, I doubt a fork(2) from cron(8) and a statfs(2) would be =
onerous on a system. :)

Devd already receives several ZFS-based events (failed vdev, I/O error, =
checksum mismatch, etc.), so perhaps it would be useful to add another, =
e.g., "space" which is set to be triggered when a pool attains a certain =
percentage full.  This could default to 100%, but be capable of being =
set lower by an associated kernel sysctl.  You could then have any =
auto-pruning/snapshot management script triggered from devd.  (You'd =
probably also have to figure out some kind of throttling mechanism for =
this devd event, too.)

Cheers,

Paul.

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