zfs discuss - Oct 2008 - [osol-rfe] RFE: ZFS quotas and reservations

Mark Wymer wrote:
> Something for consideration perhaps, as well as being able to specify the
quota and reservation sizes as an absolute number it would be nice to be able to
specify a relative percentage too.
> 
> i.e. zfs create -o quota=10% tank/testfs
> 
> This would enable the quota to grow as/when the size of the pool is
increased.
Sounds like a reasonable suggestion to me.

I''ve cc''d zfs-discuss@ since that will catch more of the ZFS
developers
and lots of other users.
> A step further would be to have an indicator to differentiate between a
percentage of the pool without taking into concideration the quotas of other
datasets in the pool or after taking account of the quotas of other datasets in
the pool.
> 
> Cheers,
> Mark.
> e.g. if your pool had 100Gb 
> zfs create -o quota=50g tank/fs1
> zfs create -o quota=-10%    = 10Gb (100Gb * 10%) - ignores the quota for
fs1
> zfs create -o quota=+10%    = 5Gb (100Gb - 50Gb * 10%) - accounts for the
50Gb for fs1
I think in the +10% you would actually want a reservration of 50g on 
tank/fs1 to achieve this effect.

-- 
Darren J Moffat