<div dir="ltr"><br><div class="gmail_extra"><br><div class="gmail_quote">On Tue, May 17, 2016 at 8:21 AM, Mats Ramnefors <span dir="ltr"><<a href="mailto:mats@ramnefors.com" target="_blank">mats@ramnefors.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">I am testing a DRBD 9 and 8.4 in simple 2 node active - passive clusters with NFS.<br>
<br>
Copying files form a third server to the NFS share using dd, I typically see an average of 20% CPU load (with v9) on the primary during transfer of larger files, testing with 0,5 and 2 GB.<br>
<br>
At the very end of the transfer DRBD process briefly peaks at 70 - 100% CPU.<br>
<br>
This causes occasional problems with Corosync believing the node is down. Increasing the token time for Corosync to 2000 ms fixes the symptom but I am wondering about the root cause and any possible fixes?<br>
<br>
This is the DRBD configuration.<br>
<br>
resource san_data {<br>
protocol C;<br>
meta-disk internal;<br>
device /dev/drbd1;<br>
disk /dev/nfs/share;<br>
net {<br>
verify-alg sha1;<br>
cram-hmac-alg sha1;<br>
shared-secret ”****************";<br>
after-sb-0pri discard-zero-changes;<br>
after-sb-1pri discard-secondary;<br>
after-sb-2pri disconnect;<br>
}<br>
on san1 {<br>
address <a href="http://192.168.1.86:7789" rel="noreferrer" target="_blank">192.168.1.86:7789</a>;<br>
}<br>
on san2 {<br>
address <a href="http://192.168.1.87:7789" rel="noreferrer" target="_blank">192.168.1.87:7789</a>;<br>
}<br>
}<br>
<br>
The nodes are two VM on different ESXi hosts (Dell T620). Hosts are very lightly loaded. Network is 1 Gb at the moment through a Catalyst switch. Network appears not saturated.<br>
<br>
BTW when can we expect a DRBD resource agent for v9? It took me a while to figure out why DRBD9 was not working with Pacemaker and then finding a patch to the agent :)<br>
<br>
Cheers Mats<br>
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<a href="http://lists.linbit.com/mailman/listinfo/drbd-user" rel="noreferrer" target="_blank">http://lists.linbit.com/mailman/listinfo/drbd-user</a></blockquote><div><br></div><div>Hi Mats,<br><br></div><div>Can you please share the patch if you don't mind?<br><br></div><div>Thanks,<br></div><div>Igor <br></div></div><br></div></div>