<div>Reply inline:</div><div><br></div>On Wed, Jan 12, 2011 at 8:50 AM, Dan Barker <span dir="ltr"><<a href="mailto:dbarker@visioncomm.net">dbarker@visioncomm.net</a>></span> wrote:<div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
As to the I/O handling with DEBD+GFS2+NFS Primary/Primary, I do not know the<br>
answer. Maybe someone else on the list can help.<br>
<br>
Dan, in Atlanta (the Top Poster)<br></blockquote><div><br></div><div>Oh we got a RFC-1855 heretic here ;-)</div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div><div></div><div class="h5"><br>
-----Original Message-----<br>
From: <a href="mailto:drbd-user-bounces@lists.linbit.com">drbd-user-bounces@lists.linbit.com</a><br>
[mailto:<a href="mailto:drbd-user-bounces@lists.linbit.com">drbd-user-bounces@lists.linbit.com</a>] On Behalf Of Ivan Pavlenko<br>
Sent: Tuesday, January 11, 2011 4:29 PM<br>
To: <a href="mailto:drbd-user@lists.linbit.com">drbd-user@lists.linbit.com</a><br>
Subject: [DRBD-user] DRBD settings difficulties with understanding<br>
<br>
Hi ALL,<br>
<br>
I'm a new to DRBD and have some difficulties with understanding of drbd<br>
settings. I've been reading manuals hard but still have lots of questions.<br>
<br>
1) Configuring I/O error handling strategies I see detach method is highly<br>
recommended but pass_on is still default method. Why? What differences<br>
between these methods? Why we have unrecommended method as default instead<br>
of the first one? I have<br>
DEBD+GFS2+NFS Primary/Primary solution. What should I use in my case? Why?<br></div></div></blockquote><div><br></div><div><br></div><div>First off, break this into 2 parts: DRBD+GFS2 and GFS2+NFS. I'll answer the DRBD+GFS2 part. The GFS2+NFS part can be examined without DRBD. I'd suggest looking at: <a href="http://sources.redhat.com/cluster/doc/nfscookbook.pdf">http://sources.redhat.com/cluster/doc/nfscookbook.pdf</a> </div>
<div><br></div><div><br></div><div>common {</div><div> startup {</div><div> wfc-timeout 0 ; # Wait forever for initial connection</div><div> degr-wfc-timeout 60; # Wait only 60 seconds if this node was a degraded cluster</div>
<div> }</div><div> net {</div><div> # these split-brain options automatically repair common cases with GFS2</div><div> # and at a minimum ensure integrity</div><div> after-sb-0pri discard-zero-changes;</div><div>
after-sb-1pri discard-secondary;</div><div> after-sb-2pri disconnect;</div><div> cram-hmac-alg sha512;</div><div> shared-secret "replace this secret";</div><div> }</div><div> handlers {</div><div>
split-brain "/usr/lib/drbd/notify-split-brain.sh sysadmin@fixme.tld";</div><div> }</div><div> disk {</div><div> # be safe, go into diskless mode</div><div> on-io-error detach;</div><div> }</div><div>
syncer {</div><div> verify-alg md5;</div><div> }</div><div>}</div><div><br></div><div>In your resource you need this to make it dual-primary:</div><div><br></div><div>resource some-resource {</div><div> [...]</div>
<div><div> net {</div><div> allow-two-primaries;</div><div> }</div><div> startup {</div><div> become-primary-on both;</div><div> }</div></div><div>}</div><div><br></div><div>That what you need from DRBD for GFS2. You'll need to assure fencing somehow. I personally use power-fencing. Once you have the DRBD+GFS2 specifics above down, you probably want to research GFS2+NFS.</div>
<div><br></div><div>-JR</div></div>