Server Performance

[Guest Redleg6]

We have a client-server application that we are having perfomance problems

on.

 

The server runs a very complex medical archiving application that is

accessed by clients. The server runs Win2003 R2, the clients are a mixture

of XP and 2000. Occassionally the server's avg disk queue length will

increase suddenly and stay high (100+) for 15-20 seconds, drop down and then

repeat again. When it is high the performance on the workstations suffers

significantly.

 

When the avg disk queue length increases pages\sec increases only a little.

 

What could be our problem?

[Guest Paul Weterings]

Re: Server Performance

 

Redleg6 wrote:

> We have a client-server application that we are having perfomance problems

> on.

>

> The server runs a very complex medical archiving application that is

> accessed by clients. The server runs Win2003 R2, the clients are a mixture

> of XP and 2000. Occassionally the server's avg disk queue length will

> increase suddenly and stay high (100+) for 15-20 seconds, drop down and then

> repeat again. When it is high the performance on the workstations suffers

> significantly.

>

> When the avg disk queue length increases pages\sec increases only a little.

>

> What could be our problem?

>

>

You might want to give sysinternals process monitor a spin...

http://technet.microsoft.com/en-us/sysinternals/bb896645.aspx

 

 

--

 

/ ) Regards,

/ /_________

_|__|__) Paul Weterings

/ (O_) http://www.servercare.nl

__/ (O_)

____(O_)

[Guest George Yin]

RE: Server Performance

 

Hello,

 

I agree with Paul, you may need to use the Process Explorer to find out

what application has the highest I/O reads and writes. You may need to

calculate the reads/writes per second manually. Or, you can try FileMon to

see what application is frequently accessing the disk in real-time when the

Avg.Disk Queue Length is high.

 

Please take a look at the following blog about how to use these two

utilities to monitor the disk access:

 

http://www.iishacks.com/index.php/2008/09/12/high-avg-disk-queue-length-and-

finding-the-cause/

 

Sincerely,

George Yin

Microsoft Online Support

Microsoft Global Technical Support Center

 

Get Secure! - http://www.microsoft.com/security

=====================================================

When responding to posts, please "Reply to Group" via your newsreader so

that others may learn and benefit from your issue.

=====================================================

This posting is provided "AS IS" with no warranties, and confers no rights.

[Guest Redleg6]

Re: Server Performance

 

The disk read sec performance is 34ms for the ap on the server. This seems

high.

 

"George Yin(MSFT)" <v-chanyin@online.microsoft.com> wrote in message

news:d0S2cctKJHA.6004@TK2MSFTNGHUB02.phx.gbl...

> Hello,

>

> I agree with Paul, you may need to use the Process Explorer to find out

> what application has the highest I/O reads and writes. You may need to

> calculate the reads/writes per second manually. Or, you can try FileMon to

> see what application is frequently accessing the disk in real-time when

> the

> Avg.Disk Queue Length is high.

>

> Please take a look at the following blog about how to use these two

> utilities to monitor the disk access:

>

> http://www.iishacks.com/index.php/2008/09/12/high-avg-disk-queue-length-and-

> finding-the-cause/

>

> Sincerely,

> George Yin

> Microsoft Online Support

> Microsoft Global Technical Support Center

>

> Get Secure! - http://www.microsoft.com/security

> =====================================================

> When responding to posts, please "Reply to Group" via your newsreader so

> that others may learn and benefit from your issue.

> =====================================================

> This posting is provided "AS IS" with no warranties, and confers no

> rights.

>

>

[Guest George Yin]

Re: Server Performance

 

Hello,

 

I meant, by that method you could find out whether it was the medical

archiving application causing the problem. Sorry if I didn't make myself

clearly.

 

If you can make sure that it is this medical archiving application causing

the problem, well, it seems very possible that you are encountering a disk

bottleneck.

 

Root cause could be that there are a lot of I/O requests accessing the disk

at one time. For example, a lot of people are accessing the medical

database at one time.

 

You can firstly try disk defragment. This will usually improve the disk

performance.

 

Then, you have two choices in this situation:

 

1. Contact the application developers to see if they can make any changes

to this application to improve the performance. For example, separate the

database file and the log files, and put them into different disks.

 

2. Add more disks into the system and convert them to dynamic disks, or

improve the physical computer performance by changing the hardware.

 

I would like to suggest that you read the following article in detail. It

gives the detailed information about the disk bottleneck and how to resolve

it:

 

http://www.sqljunkies.ddj.com/Article/D1B7C756-4725-4D31-A53D-C0A47976E6BB.s

cuk

 

Sincerely,

George Yin

Microsoft Online Support

Microsoft Global Technical Support Center

 

Get Secure! - http://www.microsoft.com/security

=====================================================

When responding to posts, please "Reply to Group" via your newsreader so

that others may learn and benefit from your issue.

=====================================================

This posting is provided "AS IS" with no warranties, and confers no rights.

[Guest George Yin]

Re: Server Performance

 

Hello,

 

I am just writing to see how everything is going. If you have any updates

or need any further assistance on this issue, please feel free to let me

know. I am glad to be of assistance.

 

Sincerely,

George Yin

Microsoft Online Support

Microsoft Global Technical Support Center

 

Get Secure! - http://www.microsoft.com/security

=====================================================

When responding to posts, please "Reply to Group" via your newsreader so

that others may learn and benefit from your issue.

=====================================================

This posting is provided "AS IS" with no warranties, and confers no rights.