OK, something is weird. I gave the VM 1 more CPU and hoped the problem will go away. But it didn't. So that I changed it back to single process VM. And the slowness problem went away. I don't see the SCSI read/write messages in the log any more. I'll run more tests tomorrow and post back the result.

This slowness problem has bothered us for several weeks. This VM reboots every night and the problem always exists.

BTW, now the VM shows "ACPI Multiprocess PC" in the device manager. How can I change it back to "ACPI Uniprocess PC"?

Thanks.

Bad news! The slowness problem doesn't go away. I tested it last night. It was OK. But It became slow again this morning. The VM gets reboot every night.  It's possible the OS reboot messed things up. I'll try a power off/on later when the users are away.

Besides the SCSI messages I didn't find any error in the vmware.log. Are these SCSI messages normal?

BTW, The other win2k VM using Buslogic driver doesn't have the slowness I/O problem.

Lars, thanks for the link. I'll check it up.

Thanks for any help.

OK, the slowness problem is resolved. The Vm's are really flying now. I think set usenamedfile to false help a lot. Thanks Roland.

However, since I also disabled memory page trimmimg and TPS. The host memory usage is really high now. I'm thinking about enabling memory page trimming and/or TPS to release some memory to the host or other VM's. Does any on have comments on these 2 parameters? I did some researches. It looks like disable them will help performance. But how much do them help (a liitle or a lot) is not very clear?

Thanks for any comment.