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Limiting the size of a ZFS dataset for timemachine

rated 0 times [ 2] [ 0] / answers: 1 / hits: 447 / 1 Year ago, sun, april 9, 2023, 10:26:22

I am trying to create a ZFS dataset with a limited size to share as a timemachine. I have managed to get the timemachine share working using netatalk but I am unable to limit the size of a zfs dataset and share it with netatalk.

I have tried sudo zfs create -V 500GB mypool/timemachine which does create a dataset but I cannot see it as a valid timemachine drive on the mac. I have noticed when running zfs list that the dataset has no mount point and I have tried zfs mount -a to mount it but no luck.

I don't have much on mypool at the moment as its a fresh install so if I have to start again and split the pool up then I can, but any advice on how to do this is apprciated.

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reangi

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answered 1 Year ago uccase · Accepted Answer

Note that you're creating a zvol (block storage) and not a dataset—due to the use of -V—which should be visible at /dev/zvol/mypool/timemachine. You can use mkfs.XXX to format this.

If you really want to create a dataset instead because you don't need a specific filesystem, leave out said -V 500GB above in order to create one and use zfs set quota=500G mypool/timemachine instead to limit its size.

https://openzfsonosx.org/wiki/Time_Machine_Backups might give you an idea how to use either storage. However, since you mentioned Netatalk above, you're likely aware of the related steps as discussed in https://openwrt.org/docs/guide-user/services/nas/netatalk_configuration.