Linux server hangs

Geofrey Rainey Geofrey.Rainey at
Fri Jan 30 07:05:34 UTC 2009

Did you type sar during a period of bad performance?

Also to look at historical performance, just type sar without
Any parameters. 

-----Original Message-----
From: redhat-list-bounces at [mailto:redhat-list-bounces at] On Behalf Of Vishnu Vardhan Reddy
Sent: Friday, 30 January 2009 8:01 p.m.
To: General Red Hat Linux discussion list
Subject: Re: Linux server hangs

Dear Kurian Thayil.
This is through remote user consoles, like telnet, FTP & SSH from Clients like Windows XP, Fedora & SUSE OS,  our network is fine, on the other hand i have one NIS server with 50 users purely work on the Dump Terminals by logging into NIS server. that server is fast.
But this server behaves diffrently. if i run sar command the optput is fine with low values, i am suspecting with the SATA 250 GB Disk, this is because when compare to SCSI disk (Fast). any other way to debug this issue.

From: Kurian Thayil <kurianmthayil at>
To: General Red Hat Linux discussion list <redhat-list at>
Sent: Friday, January 30, 2009 5:11:05 PM
Subject: Re: Linux server hangs

Hash: SHA1

Hi Vishnu,

Are you feeling the server hangs with the remote console (SSH/Telnet) or is it in the Server Console itself??? With my very little knowledge, the the I/O operations (utilizing the network) gets worse if the network isn't strong.


Kurian Thayil.

Vishnu Vardhan Reddy wrote:
> Dear All,
> I just had a really bad experience with one of the IBM Server which 
> has Red Hat RHEL 4 WS with update 6 OS on it. It has two SATA hard 
> disks out of which one is of 80 GB( contains /boot, / & swap
> partitions) and on other disk 250 GB single partition ( /data).
> On this serve I am currently running samba, nfs, ftp services & some 
> embedded tools, with 20 users who works entirely on this server 
> through telnet, samba services, and compiles the source on this 
> related to embedded tools.
> My problem is, if all the users are logged in through telnet, ftp and 
> access data through samba and perform some I/O operations like 
> copying, moving and deleting data, the server getting hanged for 30 
> seconds and further becomes slow until the application is closed or 
> completed, this effects other users terminals.
> As per my observation if I copy some 500 MB file from partition to 
> partition, from disk to disk, or when I start checkout from CVS the 
> CPU utilization is showing less, but server freezes for some time.
> Even I cont open any file through VI, after the application is closed 
> the server becomes fast, all the users can work with VI editor.
> Can anyone help me in this issue?
> Thanks
> Vishnu

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