does anyone from VMware have any comment on this as we really REALLY need an answer.
I have a similar problem: windows xp sp2 installation.
Copying files from one internal harddisk to another internal
hardisk is extremely slow. (fat32->fat32)
Booting the machine to Linux, and doing the same copy goes
a \*lot* faster (10 minutes instead of hours)
Since I do not use VMWare, this may be a windows issue, but
I have not found any knowledgebase article describing it.
What is your guest cpu utilization during large file copy?
At the same time, what is host cpu utilization?
Is your disk space fragmented ?
This might have a high impact for the VM I/O
I have the exact same issue... I have tried defrag... Checked all the counters in the world and for whatever reason the copy starts off good and then about 10 minutes in no more time frame is given. It will then pick back up after a while. I as well as dell support are completely baffled. I thought it was a hardware issue at first which is the reason we got Dell involved. Hopefully someone will post a solution or at least a reason soon.
I have the same problem with ESX 3.0. I have guest OS SuSE Linux, Windows 2000 and Windows 2003 all with the same slow disk i/o. For example, a 2 GB disk write is taking almost 3 minutes where on a stand alone machine it takes under 30 seconds. The machines are nearly useless. We are just starting out with VMware and so far I am disappointed and ready to dump VMware. I hope someone has an idea on this. It is obviously not the guest OS causing the problem.
Good thinking. My server and guest OS are on the list but I have to go check on the disk drives and controller. It is a HP Proliant DL380 with all standard HP hardware (drives, RAM and such). It has 6 72GB drives and 12GB RAM.
disabling memory trimming makes VMs with large ammount of memory working faster. <-- and fixes some of the disk i/o problems (makes less overhead)
I use a domain controller inside a vmware server.. I disabled the write cache for my virtual scsi hard drives. It fixed my slow disk access performance issues.