<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta content="text/html;charset=ISO-8859-1" http-equiv="Content-Type">
<title></title>
</head>
<body bgcolor="#ffffff" text="#000000">
I excuse myself in advance because this question is a bit off topic.<br>
<br>
I'm testing DRBD with XenServer Citrix.<br>
<br>
My test environment is made with 2 sata II disks on each quad core pc.
One drive is for xenserver installation the second is the VMs storage.<br>
<br>
DRDB first sync highlighted an average speed of 80MB/sec, fine.<br>
<br>
I installed a windows 7 32 bit guest and by the meaning of this kind
free tool, portable edition (no installation needed)<br>
<font face="arial" size="-1"><strong>Disk Throughput Tester 2.00 R11
(build 208) </strong></font>developer website and download
<a class="moz-txt-link-freetext" href="http://www.objectso.nl/downloads.html">http://www.objectso.nl/downloads.html</a><br>
<br>
I measured the windows write to disk performance with a 512MB size test
file <br>
I made the test 3 times, with 64K, 128K and 256K block sizes.<br>
<br>
Write performaces are really poor<br>
64K - 10MB/sec<br>
128K - 16MB/sec<br>
256K - 18MB/sec<br>
<br>
Looks like this is a common issue in VMs guests both windows and linux,
but most of the times is it windows related.<br>
<br>
Do you have any experience to explain this issue? If you had it and in
some way, you fixed it, would you like to kindly share the solution?<br>
If you never measured Windows guests write to disk performance, would
you like to do the same test and share your results? This is obviously
intended made with sata II drives.<br>
<br>
Thank you for any idea.<br>
<br>
Robert<br>
</body>
</html>