Slow IO

  • Thread starter Thread starter Guest
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Guest

Hi,

I have trouble with performance on Windows 2000 Server (dual processor, 1GB RAM, ..,DHCP, switch, Lan 10/100) and clients WIndows xp, Windows 2000 workstation. Our application is performing very slow regarding all read/write operations with ISAM database.

I tested network with instrument (Fluke) but there was only 5-10% utilization when our application performed read/write actions. It is interesting, that when copying files accross network I got 50-60% utilization and quite normal speed. And of course zero packages lost!

I also tested with independent network test application TestIO.EXE(from http://www.support.tabs3.com/main/r10054.htm) and I got the folowing results:
- 0.5 Mb/Sec read/write when executing test application from local computer on server (!?!?!)
- 20 Mb/Sec read/write when executing test application on local computer
- 25 Mb/Sec read/write when executing test application on server computer (logged as administrator on server)

I tried with OpLocks but there was no difference.

I would appreciate any idea.

Thanks,

Joze Gerjevic
 
I would suggest taking a sniff of the traffic between the client and server
and see if we the client is waiting or the server is waiting. That would be
a good indication of where to begin looking.

--
Brian Oakes
This posting is provided "AS IS" with no warranties and confers no rights.
Please reply to the newsgroup so that others may benefit.

Joze Gerjevic said:
Hi,

I have trouble with performance on Windows 2000 Server (dual processor,
Click to expand...
1GB RAM, ..,DHCP, switch, Lan 10/100) and clients WIndows xp, Windows 2000
workstation. Our application is performing very slow regarding all
read/write operations with ISAM database.
I tested network with instrument (Fluke) but there was only 5-10%
Click to expand...
utilization when our application performed read/write actions. It is
interesting, that when copying files accross network I got 50-60%
utilization and quite normal speed. And of course zero packages lost!
I also tested with independent network test application TestIO.EXE(from
Click to expand...
http://www.support.tabs3.com/main/r10054.htm) and I got the folowing
results:
- 0.5 Mb/Sec read/write when executing test application from local computer on server (!?!?!)
- 20 Mb/Sec read/write when executing test application on local computer
- 25 Mb/Sec read/write when executing test application on server computer
Click to expand...
(logged as administrator on server)
 
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