Ok, update. I found time and resources to relocate the server to our office. Now I added an IDE disk and put an img file on that and exported it using Starwind. You can guess, When writing to this target/device I get 700Mbps. constant. When writing to an image located on my RAID5 set I get barely 10...

I just finished testing on our own environment. Now I get 1Gpbs througput. ESX and windows version are the same, the hardware is completely different. Could this really be hardware issue? The environment with the problem does use VMWare certified hardware, but it's a clone server (SuperMicro). EDIT:...

Yes, I very much would like to know that too.

Sadly I don't have storage vmotion, it's two free edition stand alone hosts at that site.


I'm currently in the process of setting up another starwind server in our own test environment to see I get similar results.

this is set to 1. And yes, I changed it to 10 and now I get 70+ MB/s :oops: oops.. But... It all began when I copied one 2GB file to VMDK hosted bij Starwind. My 1Gbps netwerkconnection only gets used by 15% (on the starwind server) It still does this... VMWare performance monitor shows the same. So...

When I add about 10 worker thread in a VM, I get 75MB/s throughput. Was I just testing wrong? I would expect when copying a single file to get the maximum available throughput, but that's not happening. However, the throughput is available when copying multiple files. There is still something wrong ...

Thanks for your reply. I added a new image file and set "no-caching". Still I'm getting only 20MB/s throughput. I also tried with the op option "asynchronous" disabled, but no change. From the RAM disk i got 30MB/s. Noteworthy though is that i'm only using one worker thread (for ...

It is an image file. Cache in Starwind is configured as write back. But i don't have any battery backed up cache on my hardware, so the hardware storage controller is write through (so not using write cache). Unfortunately I don't have other hardware to install starwind on. edit: just a plane old im...

Could you please clarify - which test gives you 70 mbs? Is it your local hard drive or is it a test of an iSCSI device attached to the localhost? I ran IOMeter on the machine where I installed Starwind on. I did this so see if my storage itself wasn't the problem. I got 70MB/s. Not astronomical, bu...

Ok update: I now ran IOMeter with same settings directly on the Starwind server. I got about 70MB/s then using the MS Windows iSCSI initiator ON THE STARWIND SERVER, I connected to 127.0.0.1. I ran IOMeter again on the iSCSI volume. Now I got only 20MB/s! So Starwind does seem the bottleneck. What c...

I now had the opportunity to test on a different switch. But still got the same results. I mounten a VMDK on the SAN. From the VM I ran IOMeter with 100% reads using 16K blocks within 1GB (2048000 sectors) file. I get a 15MB/s consistent read speed. I did the same for the NFS test with the same resu...

Yes, i've got a dedicated nic for storage. (i've got 4 actually, but before I got this resolved I keep testing with one) EDIT: Yesterday I installed a second ESX host. Sadly with the same hardware as the other one. This one is not in production yet (the other one is hosting production VM's on local ...

By the way, when using IPerf I get 300Mbps from a VM to the Starwind server using default settings (8KB window size)

Hi Anton, Thanks for you're replies, but it's not clear what you mean 1) Did you follow the link I gave? Second part about ESXi client configuration and not Windows server? I followed this link: http://www.starwindsoftware.com/forums/starwind-f5/recommended-settings-for-esx-iscsi-initiator-t2296.htm...

Hi Anton, Thanks for you're replies, but it's not clear what you mean 1) Did you follow the link I gave? Second part about ESXi client configuration and not Windows server? I followed this link: http://www.starwindsoftware.com/forums/starwind-f5/recommended-settings-for-esx-iscsi-initiator-t2296.htm...

Did you apply the changes to ESXi box following the link I gave? What TCP numbers do you get with NTtcp and IPerf? What changes? I've bonded my vmkernel port to the iSCSI software adapter. I have one vNic per host for iSCSI, so I cannot configure teaming. Surely I should be able to get more than 15...