<div class="gmail_quote">On Tue, Apr 21, 2009 at 2:47 PM, Roof, Morey R. <span dir="ltr"><<a href="mailto:MRoof@admin.nmt.edu">MRoof@admin.nmt.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
This is a really interesting discussion. I use DRBD to replicate<br>
volumes that are exported via blockio with IET and have never gotten<br>
this message. I currently use DRBD 8.0.16 and over the last year with<br>
8.0.x series this message has never appeared. Before deployment all<br>
sorts of io tests were conducted and this message wasn't present then<br>
either.</blockquote><div><br>Thanks for the input. What are the initiators that you're using? <br><br></div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
So, I have an idea of a setting for you to change on your iSCSI target<br>
system and I'm really curious if the message goes away. In IET we have<br>
"InitialR2T Yes" but the default is "No". Trying running that way and<br>
see what happens as I'm very curious about the results.<br></blockquote></div><br>Just tried "InitialR2T Yes", and there was no effect; the concurrent write warnings are still being generated.<br><br>As a side note for anyone who would like to test this, on windows in particular, here's one of tools I use to duplicate this:<br>
<br>SQLIO: <a href="http://www.microsoft.com/downloads/details.aspx?familyid=9a8b005b-84e4-4f24-8d65-cb53442d9e19&displaylang=en">http://www.microsoft.com/downloads/details.aspx?familyid=9a8b005b-84e4-4f24-8d65-cb53442d9e19&displaylang=en</a><br>
Contents of param.txt (this assumes f: is the remote storage, and you have one gb free space available): f:\testfile.dat 4 0x0 1024<br>Command to run: sqlio -kW -s60 -frandom -o8 -b8 -LS -Fparam.txt<br><br>-Gennadiy<br>