topic Re: Disk Space Error in Operating System - HP-UX

Disk Space Error

David Tang_1 — Fri, 22 Sep 2000 03:05:43 GMT

I have a workstation running hp-ux10.2. The problem is that when i do a bdf, one of the logical volume's hard disk space does not tally up. The addition of used and avail is less than the value under kbytes. May I know if there is anyway I can recover these 'lost' space?
The physical hard disk only have one logical volume.

Re: Disk Space Error

Stefan Farrelly — Fri, 22 Sep 2000 05:48:03 GMT

bdf is known for not being so accurate. There are other ways to tally up your diskspace, use du -sk instead. This gives results in Kbytes and is much more accurate, or use df.

Re: Disk Space Error

CHRIS_ANORUO — Fri, 22 Sep 2000 05:59:58 GMT

Check this previous thread for contributions and steps to address this issue: http://my1.itrc.hp.com/cm/QuestionAnswer/1,1150,0xbf587e990647d4118fee0090279cd0f9,00.html

Re: Disk Space Error

Andy Monks — Fri, 22 Sep 2000 06:34:10 GMT

bdf is very accurate, however, it can be miss leading. Used + Free doesn't equal Total. This is because the overhead of the filesystem isn't included in Used or Free but is in Total.

du will always equal the used in bdf unless you've mounted over some files and then bdf will be higher.

You may want to look at fstyp -v and see what that gives too. That is where bdf gets it's info from (hence why it's right). If you have any questions still, post the output from fstyp and bdf for the filesystem your concerned about.

Also, if it's hfs it will have a minfree value. This will be 10% by default and is again not shown in used/free.

Re: Disk Space Error

David Tang_1 — Fri, 22 Sep 2000 06:42:13 GMT

The funny thing is that if i use bdf, i get a total of 2047673 whereas if i use df -k i get the total as 1842905. So which is the right one??

Re: Disk Space Error

Andy Monks — Fri, 22 Sep 2000 07:08:57 GMT

If you look at fstyp -v as well, you'll see that bdf matches the value of f_blocks (total blocks in the filesystem).

bdf is reporting the total size of the filesystem (including the overhead for it's structure etc (so the inodes and), where as df -k is only reporting on the usable space.