Slow file transfers from ESXi to Virtual Center (physical)

[pdoherty972]

VCenter is attached with 1Gb ethernet

ESXi systems are 10Gb ethernet

iSCSI is on 10Gb ethernet

When I "Browse Datastore" and go to download a large file (.tar) from the iSCSI datastore the transfer is extremely slow (in spite of being fast for normal VM activities).  It runs at less than 1% most of the time, peaking occasionally above 70-80% briefly before returning to less than 1%.  Here is what the network graph while a transfer is underway looks like:

Any idea why this is occurring?

[arturka · Accepted solution]

Hi

That's realy odd, have you tried download file using WinSCp or FastSCP from Veeam ? If not give a try with one of the tools.

What is the transfer between vCenter and other servers ? Maybe it's a problem with duplex mismatch settings between  vCenter network card and switch port ?

Cheers
Artur

Please, don't forget the awarding points for "helpful" and/or "correct" answers.

[jrvision]

From my experience, this depends greatly on the patch level you have.  not even the version, but the patch level makes a difference.

i can get 35 MB/sec using veeam.  everything else i get around 25 MB/sec.  i'm on 5.0 newest now.

vmware must throttle this in some manner, because why would veeam be better than other methods?

in any case, with different patch levels i was as low as 15 MB/sec, sometimes slower.

if i remember correctly, 4.1.1 was really slow and 4.1.3 was much better.