CentOS - Dec 2010 - tmpfs says "No space left on device"

I have a server where we use tmpfs as a cache for temporary files used
by a web application.  But occasionally this tmpfs thinks it is full
when it isn't.

[root at flask-yellow tmpfs]# touch file
touch: cannot touch `file': No space left on device
[root at flask-yellow tmpfs]# df -k
Filesystem           1K-blocks      Used Available Use% Mounted on
none                    393216     19296    373920   5% /srv/tmpfs

Simply unmounting and remounting /srv/tmpfs resolves the issue.

2.6.18-164.11.1.el5

Any suggestions as to the cause of this or workarounds are appreciated.

On 1 December 2010 14:13, Adam Tauno Williams <awilliam at whitemice.org>
wrote:
> I have a server where we use tmpfs as a cache for temporary files used
> by a web application. ?But occasionally this tmpfs thinks it is full
> when it isn't.
>
> [root at flask-yellow tmpfs]# touch file
> touch: cannot touch `file': No space left on device
> [root at flask-yellow tmpfs]# df -k
> Filesystem ? ? ? ? ? 1K-blocks ? ? ?Used Available Use% Mounted on
> none ? ? ? ? ? ? ? ? ? ?393216 ? ? 19296 ? ?373920 ? 5% /srv/tmpfs
>
> Simply unmounting and remounting /srv/tmpfs resolves the issue.
>
> 2.6.18-164.11.1.el5
>
> Any suggestions as to the cause of this or workarounds are appreciated.
>
Webserver process holding the file handles open so that the space
doesn't get released maybe?

> -----Original Message-----
> From: centos-bounces at centos.org 
> [mailto:centos-bounces at centos.org] On Behalf Of Adam Tauno Williams
> Sent: Wednesday, December 01, 2010 9:14 AM
> To: centos at centos.org
> Subject: [CentOS] tmpfs says "No space left on device"
> 
> I have a server where we use tmpfs as a cache for temporary 
> files used by a web application.  But occasionally this tmpfs 
> thinks it is full when it isn't.
> 
> [root at flask-yellow tmpfs]# touch file
> touch: cannot touch `file': No space left on device 
> [root at flask-yellow tmpfs]# df -k
> Filesystem           1K-blocks      Used Available Use% Mounted on
> none                    393216     19296    373920   5% /srv/tmpfs
What does lsof show regarding file open on this device?  I'm thinking
files opened, then unlinked, but file descriptors not yet closed.
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