The Mystery of the Missing File System Space

[Colin D. Carruthers]

Good Morning All.

I have a vxfs file system (HP-UX 11.00) which was used to install oracle, but is now empty (or it should be!). But a bdf shows:

server3 # bdf | grep fs10
/dev/vg01/lvol3 8323072 3140 7799944 0% /fs10

I have even removed the logical volume, recreated it and newfs'ed it, and it's still not recovered the space! A fstyp -v shows:

server3 # fstyp -v /dev/vg01/lvol3
vxfs
version: 3
f_bsize: 8192
f_frsize: 1024
f_blocks: 8323072
f_bfree: 8319932
f_bavail: 7799937
f_files: 2080012
f_ffree: 2079980
f_favail: 2079980
f_fsid: 1073807363
f_basetype: vxfs
f_namemax: 254
f_magic: a501fcf5
f_featurebits: 0
f_flag: 16
f_fsindex: 6
f_size: 8323072

Mounting it at another mount point results in the same thing. Any help or suggestions gratefuly received.
Colin.

[Robert-Jan Goossens · Accepted solution]

Hi Colin,

I don't think you are missing space in this volume, vxfs filesystems use +/- 7 % for logging 93 % of 8323072 = 7740456.

Hope this helps,

Robert-Jan.

[Mei Jiao]

Please kindly note that a newly created logical volume will have empty space in it.

Did you do a backup on this filesystem where you installed the Oracle?

[Colin D. Carruthers]

I didn't know the logging took up so much space! Thanks to those who answered.

[James Lynch]

Every file system will have some sort of overhead that is reserved for internal management of its data structures. HFS has to maintain structures like superblock, inodes, cylinder groups and freelists. All of this stuff takes up space. Now with VxFS filesystems, they need mode space to handle moany of the same types of items as well aas the intent log.

JL