LinuxQuestions.org
Welcome to the most active Linux Forum on the web.
Go Back   LinuxQuestions.org > Forums > Enterprise Linux Forums > Linux - Enterprise
User Name
Password
Linux - Enterprise This forum is for all items relating to using Linux in the Enterprise.

Notices

Reply
 
LinkBack Search this Thread
Old 01-25-2005, 02:54 PM   #1
gmccormack
LQ Newbie
 
Registered: Feb 2004
Location: Massachussetts
Posts: 11

Rep: Reputation: 0
Question Poor system performance, Red AS 2.1, Dell CX400


Hi,

We are running Red Hat AS 2.1, kernel 2.4.9-e34enterprise on a Dell 6650.
The server has two 2.0 ghz CPUs with a mb of cache and 16 gb (yes 16 gb of RAM). We have a Dell CX400 attached via fiber that has 15 10k 73 gb drives in a RAID 5, 14 disks make up one big LUN and disk 15 is used for hot swap. We have an additional 6650 attached via fiber for failover. We are getting poor performance from the system and I am looking for ways to improve performance. The hdparm number I get from "hdpart -tT /dev/sda" looks like this from the secondary server:

hdparm -tT /dev/sda

/dev/sda:
Timing buffer-cache reads: 128 MB in 0.32 seconds =400.00 MB/sec
Timing buffered disk reads: 64 MB in 1.29 seconds = 49.61 MB/sec
[root@engaccurev0 shared]# hdparm -tT /dev/sda

/dev/sda:
Timing buffer-cache reads: 128 MB in 0.32 seconds =400.00 MB/sec
Timing buffered disk reads: 64 MB in 1.85 seconds = 34.59 MB/sec
[root@engaccurev0 shared]# hdparm -tT /dev/sda

/dev/sda:
Timing buffer-cache reads: 128 MB in 0.32 seconds =400.00 MB/sec
Timing buffered disk reads: 64 MB in 1.06 seconds = 60.38 MB/sec
[root@engaccurev0 shared]#

I am not sure the above means anything. I have talked to Red Hat about going to the latest kernel but I am not sure it will give us the performance increase we are looking for. I am considering changing the CX400 from a RAID 5 to a RAID 1+0. I know my disk space will be cut in half but we need a performance boost. Has any body done this? Can they tell me what they saw for a performanc increase? Any suggestions for increasing performance would be greatly appreciated. Thanks.

Gary McCormack
gmccormack@kronos.com
 
Old 01-25-2005, 06:30 PM   #2
thorn168
Member
 
Registered: Oct 2004
Location: USA
Distribution: Vector Linux 5.1 Std., Vector Linux 5.8 Std., Win2k, XP, OS X (10.4 & 10.5)
Posts: 344

Rep: Reputation: 42
Hi Gary,

After reading your post I am not quite sure that you have software problem.

<Thorn Puts on his A+ & Network+ hats.>

Your Dell 6650 has 16 GB of Memory, 15 HDs, 2 Pentium Xeon cpus and cooling fans for all of this hardware. Dell says that you have (2) 900watt power supplies.

I would check the following things:

Do you have enough power from the power supply to run your hardware configuration?

Is heat an issue that could be slowing things down?

Is the internal system bus slowing you down? How fast is your raid controller?

Is the fiber channel connection properly configured?

Also I would monitor the traffic on the wire. It is possible the server is fine but that there is excessive traffic on the network causing a slow down in perfomance.

I hope this helps,

Thorn168
 
Old 01-25-2005, 06:56 PM   #3
thorn168
Member
 
Registered: Oct 2004
Location: USA
Distribution: Vector Linux 5.1 Std., Vector Linux 5.8 Std., Win2k, XP, OS X (10.4 & 10.5)
Posts: 344

Rep: Reputation: 42
Hi Gary,

I forgot to mention one addition thing:

Have you checked the Hard drives for fragmentation?

that could also slow you down.

Thorn168
 
Old 01-26-2005, 08:21 AM   #4
gmccormack
LQ Newbie
 
Registered: Feb 2004
Location: Massachussetts
Posts: 11

Original Poster
Rep: Reputation: 0
Hi Thorn,

Thanks for the reply. Power and heat should not be a problem. I just upgraded the Megaraid drivers from Megaraid to Megaraid2 and upgraded to the latest firmware on the LSI card. I also just moved the system to a gigabit subnet and I removed the Broadcomm bcm5700 drivers and teaming and put in TG3 drivers. I have not checked the hard drives for fragmentation but the system has only been in use for less than a year.
I think the CX400 RAID 5 made be configured incorrectly since I have 14 disks in one RAID Group. Thanks again, if you think of anything else please let me know.

Gary
 
Old 01-26-2005, 12:25 PM   #5
thorn168
Member
 
Registered: Oct 2004
Location: USA
Distribution: Vector Linux 5.1 Std., Vector Linux 5.8 Std., Win2k, XP, OS X (10.4 & 10.5)
Posts: 344

Rep: Reputation: 42
Hi Gary,

Just out of curiosity, Why do you think that OS seems to be slowing you down?

Thorn
 
Old 01-27-2005, 09:08 AM   #6
gmccormack
LQ Newbie
 
Registered: Feb 2004
Location: Massachussetts
Posts: 11

Original Poster
Rep: Reputation: 0
Hi Thorn,

Well I am not sure it is the OS but I know the kernel we are using is e34 and the latest from RH is e59. When the system is under a heavy load top shows the system state between 70 to 80% which would indicate that are SCM application is doing something heavy with the kernel. This is all speculation on my part. I am going to move forward with the reconfiguration of our CX400 from a RAID 5 to a RAID 10 and also try loading the latest kernel. Do you know anybody that has done that, I would like to hear how the process went and what the performance results were.
 
Old 01-27-2005, 06:21 PM   #7
thorn168
Member
 
Registered: Oct 2004
Location: USA
Distribution: Vector Linux 5.1 Std., Vector Linux 5.8 Std., Win2k, XP, OS X (10.4 & 10.5)
Posts: 344

Rep: Reputation: 42
Hi Gary,

I don't know anyone who is using RHEL with a Raid 10 configuration. Although I am curious to see if the Raid 10 setup will improve performance.

Try www.ibm.com/redbooks for Redhat Linux server info. I downloaded 2 redbooks from them on desktop migration. They may have specific redbook on server tuning with redhat linux.

The Kernel may give you the boost that you are looking for since they have improved the code that controls multithreaded processing in Intel processors.

I am still puzzling over the performance problem. Do you have other similar servers or even windows servers that you can compare the performance difference to? If so how well are they performing in comparison?

Are your clients complaining slow access and timeouts?

I want to help you more but I need to know more about the problem first.

Thorn

Last edited by thorn168; 01-27-2005 at 06:22 PM.
 
  


Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Poor Performance Red Hat AS 2.1, Dell CX400 gmccormack Red Hat 2 01-30-2005 08:17 AM
poor performance javabb Red Hat 8 01-20-2005 05:48 AM
Poor performance red hat 9 with Exceed rjg842 Linux - Networking 0 01-05-2005 02:59 PM
poor performance in x ah786 Slackware 10 11-09-2004 11:11 AM
Poor performance Shyne Red Hat 1 10-17-2004 11:50 AM


All times are GMT -5. The time now is 01:07 AM.

Main Menu
My LQ
Write for LQ
LinuxQuestions.org is looking for people interested in writing Editorials, Articles, Reviews, and more. If you'd like to contribute content, let us know.
Main Menu
Syndicate
RSS1  Latest Threads
RSS1  LQ News
Twitter: @linuxquestions
identi.ca: @linuxquestions
Facebook: linuxquestions Google+: linuxquestions
Open Source Consulting | Domain Registration