ZFS dedup and temporary freeze

[George Kontostanos]

As far as I am aware ezjail has the option to use compression and disable
access time updates.

ezjail_zfs_properties="-o compression=lzjb -o atime=off"

In my case the dedup option was turned on only in the basejail causing the
system to temporarily freeze. Once the dedup option was removed everything
went back to normal.
What I am trying to figure out here is why did this occur.

Thanks

On Wed, Mar 30, 2011 at 10:53 AM, Alexander Leidinger <
Alexander at leidinger.net> wrote:

> Quoting George Kontostanos <gkontos.mail at gmail.com> (from Tue, 29 Mar 2011
> 17:57:49 +0300):
>
>  I thought that jails would be a good candidate for dedup. So far I am
>> using
>> it without any issues in my /usr/src and /virtualBox directories.
>>
>
> No idea about your problem, but ezjail is already doing some dedup. The
> basejail is the dedup-place, and the jails do a null-mount of it. Inside the
> jails are only some links to the basejail. So if you do not install the same
> programs (the same packages, so make sure there is no different compile
> timestamp (some programs have this) inside the newly generated binaries) or
> data inside the jail-specific area, you will not have a benefit from this.
>
> Bye,
> Alexander.
>
> --
> Real programmers never work 9 to 5.  If any real
> programmers are around at 9 a.m., it's because they
> were up all night.
>
> http://www.Leidinger.net    Alexander @ Leidinger.net: PGP ID = B0063FE7
> http://www.FreeBSD.org       netchild @ FreeBSD.org  : PGP ID = 72077137
>



-- 
George Kontostanos
aisecure.net <http://www.aisecure.net>