Why the kbytes of the filesystem is smaller than size of the slice ?

[pissallio]

# df -k
Filesystem kbytes used avail capacity Mounted on
/dev/dsk/c0t1d0s0 962571 10 866304 1% /chh

partition> print
Current partition table (quar):
Total disk cylinders available: 7506 + 2 (reserved cylinders)

Part Tag Flag Cylinders Size Blocks
0 unassigned wm 0 - 434 1000.84MB (435/0/0) 2049720

Note the /chh filesystems is created on slice c0t1d0s0, But it's size is 960M which is less than that of the slice(1000M)

Why the kbytes of the filesystem is smaller than size of the slice ?

 

[KenCunningham]

I think about 9-10% of the slice is used for housekeeping by the OS, but I'm open to suggestions otherwise.

 

[daFranze]

Ken's right, the space is used for the inodetable etc....
Is this a new created filesystem or a "used" one (eg. as a cache for eg. a http-proxy)?

Best Regards, Franz
--
Solaris System Manager from Munich, Germany
I used to work for Sun Microsystems Support (EMEA) for 5 years

 

[pissallio]

Hi,daFanze
It's a newly created fs

 

[mattaw]

Don't forget all the clusters UFS needs to keep track of file names, sizes, direcories etc, and it will automatically absorb a percentage that is only useable by root. This is very handy to prevent fragmentation of the files when in use. It also means the logs will be written last before the disk fills up.

Matthew

Family motto: Curvus, non infractus.
The Universe: God's novelty screensaver?