[OmniOS-discuss] ZFS and Usage-creep

[Scott LeFevre]

Tim,

I'm interested if you sorted out the answer to your question from
Richard's response?
I've seen this situation as well and I'm curious for clear answer.

Cheers,
-- 
Scott LeFevre


On Mon, 2014-05-12 at 16:41 -0400, Tim Brown wrote:

> I have a question about ZFS usage and how to predictability allocate
> space.  I have scoured the web trying to get a good answer, but have
> yet to find one.
> 
> I am advertising 2TB datastores to our VMware cluster over fiber
> channel using comstar.  I use this command to create the dataset.
> 
> zfs create -V 2047g vmpool01/datastores/ds01
> 
> It all works great but some of my datasets are using far more that the
> 2047g(more than double in one case).  Here are some examples:
> 
> zfs list
> NAME                           USED  AVAIL  REFER  MOUNTPOINT
> ...
> vmpool01                      27.4T  20.7T   469K  /vmpool01
> vmpool01/datastores           27.4T  20.7T   384K  /vmpool01/datastores
> vmpool01/datastores/ds01      3.10T  20.7T  3.10T  -
> vmpool01/datastores/ds02      2.06T  21.4T  1.34T  -
> vmpool01/datastores/ds03      2.69T  20.7T  2.69T  -
> vmpool01/datastores/ds04      2.49T  20.7T  2.49T  -
> vmpool01/datastores/ds05      3.69T  20.7T  3.69T  -
> vmpool01/datastores/ds06      4.67T  20.7T  4.67T  -
> vmpool01/datastores/ds07      2.47T  20.7T  2.47T  -
> vmpool01/datastores/ds08      2.06T  20.8T  1.92T  -
> ...
> 
> Can someone explain this to me or is there a document somewhere that
> can tell me how to predict the usage?  Thanks.
> 
> - Tim
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