[OpenIndiana-discuss] Time Machine and quota limiting

[Robbie Crash]

I have both the sparsebundle size and the ZFS FS set. So the FS was created
with a quota of 300GB and the sparsebundle then created in there with
300GB.

Unless you're backing up multiple Macs, don't use dedup, the performance
hit you'll take will be huge after a few months unless you've got an
obscene amount of RAM, like 64+GB.

Dedup and compression give you more free space, and that's what time
machine sees.

Works great for me. I'm backing up 5 macs.
On Aug 15, 2012 5:58 PM, "Jaco Schoonen" <jaco at macuser.nl> wrote:

> Hi all,
>
> I'm reorganizing my Home NAS (somehow it got full faster than I planned…),
> which I'm using for both general purpose storage and time machine backups.
> My server is running openindiana 151_a5 with ZFS as filesystem and netatalk
> as AFP-server.
>
> I'm wondering how others are limiting time machine quota. TimeMachine will
> start cleaning up old copies if the storage is almost full, but I would
> rather have TM start cleaning up before all my disks are full. What puzzles
> me is how things like compression and dedup will have an effect on reported
> usage and amount of free space? TimeMachine can obviously never now
> anything about these details, but will have some algorithms that relies on
> the reported disk space numbers.
>
> To limit TM disk-usage I have found at least 5 different options:
> 1) Use "zfs quota" to limit the size of the filesystem.
> 2) Use "zfs refquota" to limit the referenced amount of data in the fs.
> 3) Use netatalk feature "volsizelimit"
> 4) give the sparsebundle that TM uses a maximum size (hdiutil -resize 100g)
> 5) Limit Timemachine at application level   (defaults write
> /Library/Preferences/com.apple.TimeMachine MaxSize -integer XXXX )
>
> What are you all using and how does it work out for you? What would you
> recommend?
>
> Best regards,
>
> Jaco
>
>
>
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