Re: [cobalt-users] Anonymous FTP - Overload

["Ian D. Mead" <idm@xxxxxxxxxxx>]

> From: Kris Dahl
> <krislists@xxxxxxxxxxxxx>
> To: <cobalt-users@xxxxxxxxxxxxxxx>
> Reply-To: cobalt-users@xxxxxxxxxxxxxxx
>
> ...
> > I have allowed anywhere from 150-1000 concurrent anonymous users yet
> at any
> > time using 'ps' I only see 20-40 (max) proftpd processes running and
> the
> > xferlog shows certainly no more activity.
> > 
> > Meanwhile, I have verified it's almost impossible to download the
> files.  I
> > get various messages from the site not found with FTP to the File
> not found.
> > 
> > Earlier in the day I had an error that there were too many files
> open and I
> > changed the setting for this from 1024 to 3072 and restarted the FTP
> server
> > (I know it may not be necessary).
> > 
> > If anyone has any information relating to this I would appreciate
> it.
>
> Have you tried connecting to the FTP server FROM the ftp server to make
> sure
> its functioning properly?  I would try telnetting/sshing to the
> machine,
> then ftp to localhost and see how it performs--this will take the
> network
> out of the equation.
>
> I think the machine should be able to handle 40 users fairly well, but
> do
> not have direct experience with that large of an FTP site.
>
> The reason I would wonder is 40 users at 2-10k/sec would put your
> bandwidth
> usage at about 80-400k/sec constant--eating up 1-3 T1s.  Are
> you
> expereincing a bottleneck or perhaps a lot of packetloss?  That
> could cause
> a lot of problems.

Kris,

Thanks for the response.  I have verified that telnet, http, and
ssh1 work without problem and have been continuously.  The RAQ2
montior was also reporting problems with FTP service most of the
day.

Interestingly I recently discovered that sometime during all of this
today all files and directories under the FTP structure
disappeared.  I know this was after the problems with too many files
that I corrected.  I did restart the FTP server but can't imagine
this would have caused this.

The load is high and the traffic to the site normally is at least
2-3GB/day.

Thanks again.

Ian

********************************************************

* Ian D. Mead                                          *

* IDM Computer Solutions, Inc.                         *

* idm@xxxxxxxxxxx (primary), idm@xxxxxxxxx (secondary) *

* http://www.idmcomp.com  or  http://www.ultraedit.com *

* Tel: 513 779 8549, Fax 513 779 8643                  *

********************************************************