Free space wierdness
HOLLOW, CHRISTOPHER
christopher.hollow at cgi.com
Thu Feb 5 13:48:02 PST 2004
UNIX file caching. The files were likely deleted but still open by some
process and therefore still taking up space. The reboot killed the
process, released the file and -viola- the free space was reported
correctly.
HTH,
Christopher Hollow
Herbert Wolverson wrote:
>I have a system running FreeBSD 4.9-RELEASE. It primarily functions as a firewall and
>router, and is generally pretty lightly loaded (load averages around 0.2). It
>is a low end system (P200, 64mb RAM, 2 gig hard drive), and is generally
>stable as a rock.
>
>The system has drives setup as follows:
>/ 256M (UFS)
>/usr 1.2gb (UFS+Softupdates)
>(/var and /tmp are linked onto /usr/var and /usr/tmp respectively)
>
>This morning I noticed that the "/" partition was at 108% utilization,
>and "df -h" looked like this (approximately):
>
>Filesystem Size Used Avail Capacity Mounted on
>/dev/ad0s1a 252M 256M -8M 108% /
>
>Oddly, "du -h -d1 -x" showed only a total of 29Mb used on the partition!
>The output looked like this:
>
>su-2.05b# du -h -d1 -x
> 68K ./dev
>2.0K ./usr
>2.7M ./stand
>1.3M ./etc
>512B ./proc
>4.0M ./bin
>542K ./boot
>2.0K ./mnt
>6.4M ./modules
> 30K ./root
> 12M ./sbin
>4.0K ./tmp
>4.0K ./oldvar
> 29M .
>
>When I rebooted the system (without deleting any files), "df -h" showed
>the following:
>
>Filesystem Size Used Avail Capacity Mounted on
>/dev/ad0s1a 252M 29M 203M 12% /
>
>This is good, since the correct amount of free space now shows, and the
>server is back to running perfectly. Can anyone shed any light as to why
>this discrepancy happened in the first place? I'd love to know what I can do to avoid ever having to worry
>about this again!
>
>Thanks,
>Herbert Wolverson,
>The Turner Stephenson Group, Inc.
>http://www.tsghelp.com/
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>
>
>
--
Christopher Hollow - Technical Consultant
Infrastructure & Technology Support
Toronto, ON
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