[Cialug] ZFS Storage overhead

[Matt Breitbach]

The checksums don't take up much space.  I'm not in front of a system right
now, but if you're looking at a parity based setup (raidz/z2) you can assume
it's going to be similar to raid 5/6 (respectively).  Mirrored stripes will
be similar to raid10.  Obviously there is the checksum data, but when you're
talking TB of data, that overhead is relatively insignificant.  I've got
some additional suggestions for the optimal config if you want to contact me
off-list.  It might cost you a new DSL modem though ;)

 

-Matt

 

  _____  

From: cialug-bounces at cialug.org [mailto:cialug-bounces at cialug.org] On Behalf
Of Dave Weis
Sent: Wednesday, September 28, 2011 8:47 AM
To: Central Iowa Linux Users Group
Subject: [Cialug] ZFS Storage overhead

 

 

Is there a way to calculate overhead vs usable storage for ZFS on Nexenta?
For example, if we had 8 2TB drives and wanted redundancy, how much usable
space will be left when we're done?

 

Dave

 

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