Samba trouble shoot / workaround ? Post: 302521386

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Special Forums Windows & DOS: Issues & Discussions Samba trouble shoot / workaround ? Post 302521386 by Manu.b on Wednesday 11th of May 2011 05:59:27 AM

05-11-2011

Registered User

Samba trouble shoot / workaround ?

Hello,

I've setup a ubuntu 10.04 server running samba 3.4.7 as domain controler / file server at a customer site, that works great most of the time but I face a random problem. Of course I'm never on the site when the problem occurs, so I cannot investigate in real time.

What happens is that one smb process is taking ~100% cpu time and keep opened files locked. I did not figure out how this occurs, so I would need to setup some higher debugging level in the samba log. However I'm pretty sure the problem is caused by the windows machines running a cad software (Solidworks) that create lots of temporary files that should be deleted when the assembly files are properly closed, however it seems it does not always properly close those files (and moreover the CAD softwares tends to crash regularly accoding to the customer, but nothing to do with samba, same things happens with windows file servers).

So what does it cause on the samba server : the load averrage is 1.0 or above, with one particular smb process using ~100% cpu time, and the process owner is "root" instead of the samba user that opened the files...

So far the only solution is to kill the "hung" process and delete all the messy temp files.

Since I will not be on this site in the near future to investigate this more in details, I was thinking o a script that would monitor the avg load, if the avg load is 1 or above, would try to identify the smb process causing the heavy load (based on owner = "root" and cpu time > threshould value) and kill it (kill -15 and kill -9 if the kill -15 fails after a timeout of lets say 1 minute).

I know the best solution would be to fix the root cause of the problem, but as I said I will not have time to investigate in the near future, so a workaround is needed.

I found various scripts, to monitor the avg load, some to kill a process, but I'm not sure how to properly identify the "hung" smb process. (there could be several of them and the cpu usage is of course depending of other running processes).

By the way if anyone has already faced a similar issue with samba, any advise would be appreciated.

Last edited by Manu.b; 05-11-2011 at 12:35 PM..

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tdbbackup

TDBBACKUP(8)															      TDBBACKUP(8)

NAME

       tdbbackup - tool for backing up and for validating the integrity of samba .tdb files

SYNOPSIS

       tdbbackup [-ssuffix] [-v] [-h]

DESCRIPTION

       This tool is part of the samba(1) suite.

       tdbbackup is a tool that may be used to backup samba .tdb files. This tool may also be used to verify the integrity of the .tdb files prior
       to samba startup or during normal operation. If it finds file damage and it finds a prior backup the backup file will be restored.

OPTIONS

       -h
	  Get help information.

       -s suffix
	  The -s option allows the adminisistrator to specify a file backup extension. This way it is possible to keep a  history  of  tdb  backup
	  files by using a new suffix for each backup.

       -v
	  The -v will check the database for damages (currupt data) which if detected causes the backup to be restored.

COMMANDS

       GENERAL INFORMATION

       The  tdbbackup  utility	can safely be run at any time. It was designed so that it can be used at any time to validate the integrity of tdb
       files, even during Samba operation. Typical usage for the command will be:

       tdbbackup [-s suffix] *.tdb

       Before restarting samba the following command may be run to validate .tdb files:

       tdbbackup -v [-s suffix] *.tdb

       Samba .tdb files are stored in various locations, be sure to run backup all .tdb file on the system. Important files includes:

       o

	  secrets.tdb - usual location is in the /usr/local/samba/private directory, or on some systems in /etc/samba.

       o

	  passdb.tdb - usual location is in the /usr/local/samba/private directory, or on some systems in /etc/samba.

       o

	  *.tdb located in the /usr/local/samba/var directory or on some systems in the /var/cache or /var/lib/samba directories.

VERSION

       This man page is correct for version 3.0 of the Samba suite.

AUTHOR

       The original Samba software and related utilities were created by Andrew Tridgell. Samba is now developed by the  Samba	Team  as  an  Open
       Source project similar to the way the Linux kernel is developed.

       The tdbbackup man page was written by John H Terpstra.

																      TDBBACKUP(8)