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Showing posts from September, 2016

Time Machine eating its own tail on a FreeNAS ZFS share

I work on a Mac and the OSX Time Machine is a very nice and simple feature to have backups.

While I have some other Apple gear I didn't get an Airport Time Capsule because I already had a tiny Airport Express, the Time Capsule is pricy and I'm not certain it does RAID.

So, what I use instead is the FreeBSD-based FreeNAS on an N54L MicroServer. FreeNAS allows you to easily create a Time Machine Apple Share and it works seamlessly.

The nice thing here is that the FreeNAS share is stored on a ZFS disk! And I have periodic snapshots for those shares.

So, on one side you have Time Machine storing periodic snapshots and only deleting when it needs space.

And on the other side you have the ZFS snapshots that guarantee that nothing is truly deleted!

This proves to be an interesting combination because Time Machine does not expect such a situation when you are low on disk space.

When you are low on disk space OSX's Time Machine will try to remove some data to free some space. But …