roberto.fastec at gmail
Jul 27, 2010, 2:04 AM
Post #1 of 1
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DRBD between sata II drives. Sync speed is good 80MB/sec, but...
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I excuse myself in advance because this question is a bit off topic.
I'm testing DRBD with XenServer Citrix.
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.
DRDB first sync highlighted an average speed of 80MB/sec, fine.
I installed a windows 7 32 bit guest and by the meaning of this kind free tool, portable edition (no installation needed)
Disk Throughput Tester 2.00 R11 (build 208) developer website and download http://www.objectso.nl/downloads.html"]http://www.objectso.nl/downloads.html
I measured the windows write to disk performance with a 512MB size test file
I made the test 3 times, with 64K, 128K and 256K block sizes.
Write performaces are really poor
64K - 10MB/sec
128K - 16MB/sec
256K - 18MB/sec
Looks like this is a common issue in VMs guests both windows and linux, but most of the times is it windows related.
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?
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.
Thank you for any idea.
Robert
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