Subvolume level allocation policy

Subvolume level allocation policy

[Phillip Susi]

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Is it ( yet? ) possible to manipulate the allocation policy on a
subvolume level instead of the fs level?  For example, to make / use
raid1, and /home use raid0?  Or to have / allocated from an ssd and
/home allocated from the giant 2tb hd.
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Re: Subvolume level allocation policy

[Hugo Mills]

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On Sun, Oct 23, 2011 at 02:50:50PM -0400, Phillip Susi wrote:
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> Is it ( yet? ) possible to manipulate the allocation policy on a
> subvolume level instead of the fs level?  For example, to make / use
> raid1, and /home use raid0?  Or to have / allocated from an ssd and
> /home allocated from the giant 2tb hd.

   Not yet, sorry. It's planned, but nobody's got around to
implementing it.

   Hugo.

-- 
=== Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk ===
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Re: Subvolume level allocation policy

[Jan Schmidt]

On 23.10.2011 20:50, Phillip Susi wrote:
> Is it ( yet? ) possible to manipulate the allocation policy on a
> subvolume level instead of the fs level?  For example, to make / use
> raid1, and /home use raid0?  Or to have / allocated from an ssd and
> /home allocated from the giant 2tb hd.

At least the latter can be achieved with speed profiles. I worked on
those together with Arne Jansen who sent patches in January 2011,
subject "[PATCH] Btrfs: introducing speed profiles and dedicated log
devices".

I don't assume they apply nowadays without a major rework, though. We
should get those patches merged sometime.

-Jan