Re: system gobbles disk space

[<tomas@tuxteam.de>]

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On Mon, Sep 26, 2016 at 04:38:01PM +0200, Tony van der Hoff wrote:
> On 26/09/16 16:03, tomas@tuxteam.de wrote:
> > On Mon, Sep 26, 2016 at 12:54:49PM +0200, Erwan David wrote:
> > 
> >> A possibility is that you have processes writing into deleted files. You can see them with lsof +L1 (as root)
> > 
> > Short and sweet. That's even better :-)
> > 
> That's great; thanks Tomas and Erwan (and others who replied).
> 
> So, I'm seeing this:
> 
> root@shell:~# lsof +L1
> COMMAND  PID  USER   FD   TYPE DEVICE SIZE/OFF NLINK   NODE NAME
> mysqld  3164 mysql    4u   REG 254,16        0     0 589839
> /tmp/ibvh7MKT (deleted)
> mysqld  3164 mysql    5u   REG 254,16        0     0 589840
> /tmp/ibT7D133 (deleted)
> mysqld  3164 mysql    6u   REG 254,16        0     0 589845
> /tmp/ibO9pgne (deleted)
> mysqld  3164 mysql    7u   REG 254,16        0     0 589851
> /tmp/ibOgMl6y (deleted)
> mysqld  3164 mysql   11u   REG 254,16        0     0 589852
> /tmp/ibON9JEJ (deleted)
> 
> My interpretation is that mysql has 5 deleted files of 0 size open which
> are each taking up an inode. ls /tmp is empty.

That's how I read that too.

> I guess, if there were many (how many?) such entries, the disk would
> appear full, if it ran out of  inodes.
> 
> Is that correct?

Yes -- but you'd need a lot of inodes. I'd expect the mysql process to
run into some limit on open files earlier. You can get an idea of the
state of your file system with "tune2fs -l" (I'm assuming ext2/3/4 here).

Regards
- -- t
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