file system overhead

From: pafr <pfraser_at_phcs.com>
Date: 13 Jul 2006 08:45:14 -0700
Message-ID: <1152805513.014829.307420@i42g2000cwa.googlegroups.com>

I noticed that there seems to be a 6% overhead when creating file systems on Solaris using Veritas volume manager. I created a 10 GB filesystem and the df -k and the df -h output appear as below:

hostname% df -k /opt/oracle/
Filesystem kbytes used avail capacity Mounted on
/dev/vx/dsk/orainstdg/ora-vol01

                     10485760   19038 9812559     1%    /tmp/test

hostname% df -h /opt/oracle
Filesystem             size   used  avail capacity  Mounted on


/dev/vx/dsk/orainstdg/ora-vol01

                        10G    19M   9.4G     1%    /tmp/test

The filesystem is not being used and is empty.

As you can see the size of the file system is 10GB the used amount is 19MB
and the amount available is 9.4 GB, so there appears to be 600 MB missing.
I figured this is just the overhead due to the creation of the filesystem, but 6% seems very high. If you have any information regarding this please respond. Thank you. Received on Thu Jul 13 2006 - 10:45:14 CDT