new jail utility is available. announcement.

krad kraduk at
Thu Jul 22 07:59:55 UTC 2010

On 22 July 2010 02:16, Adam Vande More <amvandemore at> wrote:

> On Wed, Jul 21, 2010 at 4:52 AM, Aiza <aiza21 at> wrote:
> >
> >  Not yet, when I have a spare box I might, although I quite like using
> >> zfs for jails as you can limit the disk usage dynamically per zfs
> >> filesystem and I didnt see any support there yet, even basic support
> >> like there is with ezjail would be nice.
> >>
> >>
> > Zfs was left out because its over kill. Sparse image jails gives the same
> > protection at a 10th of the overhead.
> You didn't factor in slowness due to having a file-backed filesystem.
>  While
> probably pretty low, it's definitely there and not good in an io heavy
> jail.  Also, the host will have to mount a UFS based FS, and cache it so
> you're going to have increased memory usage.
> Ideal setup for an io intensive jaill(eg database) is to be bound to
> compressed ZFS file-system, not a sparse image located on such a setup.
> even better when we get zfs v22 as we will have dedup. THat has its own
memory issues though.

> I'm not sure what overhead you're referring too.  If it's hard to tie into
> your application, you are probably correct, but from a host perspective you
> are increasing overhead.
> There are advantages to sparse or raw file as well, it would be nice to
> have
> a choice.
> --
> Adam Vande More
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