Tomcat hangs on SATA Linux server

[Rick Fincher <rn...@tbird.com>]

Hi All,

We have a web app running on Tomcat that accesses Oracle via JDBC on a 
Linux server (Centos 4.5) .  The web app runs fine on one server but but 
locks up or hangs for 20-30 second periods on a Dell sever running with 
SATA storage.

I only mention SATA because that is the only significant difference 
between the two servers.

Anyone have a clue what is causing this?


Thanks!

Rick



---------------------------------------------------------------------
To start a new topic, e-mail: users@tomcat.apache.org
To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
For additional commands, e-mail: users-help@tomcat.apache.org

Re: Tomcat hangs on SATA Linux server

[Mark Deneen <md...@gmail.com>]

How much memory is on the server?  Your file buffer may be too large and 
your disks can not keep up.  I think the default is 10% of memory, so if 
you can fill that up faster than the disks can write it it will hang 
until the buffer is emptied.  I doubt you are doing that much file i/o 
through a webapp though!

Mark

Rick Fincher wrote:
> Hi All,
>
> We have a web app running on Tomcat that accesses Oracle via JDBC on a 
> Linux server (Centos 4.5) .  The web app runs fine on one server but 
> but locks up or hangs for 20-30 second periods on a Dell sever running 
> with SATA storage.
>
> I only mention SATA because that is the only significant difference 
> between the two servers.
>
> Anyone have a clue what is causing this?
>
>
> Thanks!
>
> Rick
>
>
>
> ---------------------------------------------------------------------
> To start a new topic, e-mail: users@tomcat.apache.org
> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> For additional commands, e-mail: users-help@tomcat.apache.org
>


---------------------------------------------------------------------
To start a new topic, e-mail: users@tomcat.apache.org
To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
For additional commands, e-mail: users-help@tomcat.apache.org

RE: Tomcat hangs on SATA Linux server

["Caldarale, Charles R" <Ch...@unisys.com>]

> From: Rick Fincher [mailto:rnf@tbird.com] 
> Subject: Tomcat hangs on SATA Linux server
> 
> Anyone have a clue what is causing this?

Must be the day for people to leave out most relevant information.

1) What Tomcat level?

2) What JVM version?

3) What Java heap size have you specified?

4) What does JConsole show is going on during the hiccups?  (Hangs are
permanent, your situation recovers, so it's not a hang.)

5) What kind of GC activity is going on?

6) Are you experiencing page swapping during the hiccups?

7) What does a thread dump show during the hiccups?

That's just for starters.

 - Chuck


THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY
MATERIAL and is thus for use only by the intended recipient. If you
received this in error, please contact the sender and delete the e-mail
and its attachments from all computers.

---------------------------------------------------------------------
To start a new topic, e-mail: users@tomcat.apache.org
To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
For additional commands, e-mail: users-help@tomcat.apache.org

Re: Tomcat hangs on SATA Linux server

[Sameer Acharya <ac...@yahoo.com>]

Is this just with Tomcat or does it happen with other
apps too ? 

Chances are that your device driver may be having
issues and hence slowing down the system in between.

-Sameer
--- Rick Fincher <rn...@tbird.com> wrote:

> Hi All,
> 
> We have a web app running on Tomcat that accesses
> Oracle via JDBC on a 
> Linux server (Centos 4.5) .  The web app runs fine
> on one server but but 
> locks up or hangs for 20-30 second periods on a Dell
> sever running with 
> SATA storage.
> 
> I only mention SATA because that is the only
> significant difference 
> between the two servers.
> 
> Anyone have a clue what is causing this?
> 
> 
> Thanks!
> 
> Rick
> 
> 
> 
>
---------------------------------------------------------------------
> To start a new topic, e-mail:
> users@tomcat.apache.org
> To unsubscribe, e-mail:
> users-unsubscribe@tomcat.apache.org
> For additional commands, e-mail:
> users-help@tomcat.apache.org
> 
> 



      ____________________________________________________________________________________
Looking for last minute shopping deals?  
Find them fast with Yahoo! Search.  http://tools.search.yahoo.com/newsearch/category.php?category=shopping

---------------------------------------------------------------------
To start a new topic, e-mail: users@tomcat.apache.org
To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
For additional commands, e-mail: users-help@tomcat.apache.org