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Date:      Tue, 29 Mar 2011 17:57:49 +0300
From:      George Kontostanos <gkontos.mail@gmail.com>
To:        freebsd-current@freebsd.org
Subject:   ZFS dedup and temporary freeze
Message-ID:  <AANLkTik_25%2BTr10dLKnOZaGnnHYpDmF=PBAueoxCUoZB@mail.gmail.com>

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Hi List,

I am using dedup=on for my ezjail /jails directory. I noticed a strange
behavior during the installation of the ports tree in the basejail. The
system appears to freeze for a while and the cpu appears to be idle during
that time. The same behavior is shown when building ports inside the jail.

Here is some information about the pool:

               capacity     operations    bandwidth
pool        alloc   free   read  write   read  write
----------  -----  -----  -----  -----  -----  -----
zhome       15.0G  59.5G      4     14  61.2K   468K
zhome       15.0G  59.5G     38     66   107K  68.9K
zhome       15.0G  59.5G     43     71   119K  45.0K
zhome       15.0G  59.5G     37     67   103K  45.0K
zhome       15.0G  59.5G     39    103   102K  4.71M
zhome       15.0G  59.5G     42     72   114K  45.0K
zhome       15.0G  59.5G     36     59  97.9K  37.0K
zhome       15.0G  59.5G     42     69   114K  48.0K
zhome       15.0G  59.5G     39     72   105K  43.5K
zhome       15.0G  59.5G     33     58  93.4K  42.0K
zhome       15.0G  59.5G     44     77   117K  53.4K

NAME    SIZE  ALLOC   FREE    CAP  DEDUP  HEALTH  ALTROOT
zhome  74.5G  15.8G  58.7G    21%  1.06x  ONLINE  -

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.

Best Regards

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



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