emi2fast at gmail
Jan 31, 2012, 12:47 PM
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Re: cman+pacemaker+dual-primary drbd does not promote
[In reply to]
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William try to follow the suggestion of Arnold
In my case it's different because we don't use drbd we are using SAN with
ocfs2
But i think for drbd in dual primary you need the attribute master-max="2"
2012/1/31 William Seligman <seligman [at] nevis>
> On Tue, 31 Jan 2012 00:36:23 Arnold Krille wrote:
>
> > On Tuesday 31 January 2012 00:12:52 emmanuel segura wrote:
>
> >> But if you wanna implement dual primary i think you don't nee promote
> for
> >> your drbd
> >> Try to use clone without master/slave
>
> > At least when you use the linbit-ra, using it without a master-clone
> will give
> > you one(!) slave only. When you use a normal clone with two clones, you
> will
> > get two slaves. The RA only goes primary on "promote", that is when its
> in
> > master-state. => You need a master-clone of two clones with 1-2 masters
> to use
> > drbd in the cluster.
>
> If I understand Emmanual's suggestion: The only way I know how to
> implement this
> is to create a simple clone group with lsb::drbd instead of Linbit's drbd
> resource, and put "become-primary-on" for both my nodes in drbd.conf.
>
> This might work in the short term, but I think it's risky in the long
> term. For
> example: Something goes wrong and node A stoniths node B. I bring node B
> back
> up, disabling cman+pacemaker before I do so, and want to re-sync node B's
> DRBD
> partition with A. If I'm stupid (occupational hazard), I won't remember to
> edit
> drbd.conf before I do this, node B will automatically try to become
> primary, and
> probably get stonith'ed again.
>
>
> Arnold: I thought that was what I was doing with these statements:
>
> primitive AdminDrbd ocf:linbit:drbd \
> params drbd_resource="admin" \
> op monitor interval="60s" role="Master" \
> op stop interval="0" timeout="320" \
> op start interval="0" timeout="240"
>
> ms AdminClone AdminDrbd \
> meta master-max="2" master-node-max="1" clone-max="2"
> clone-node-max="1"
>
>
> That is, master-max="2" means to promote two instances to master. Did I
> get it
> wrong?
> --
> Bill Seligman | Phone: (914) 591-2823
> Nevis Labs, Columbia Univ | mailto://seligman [at] nevis
> PO Box 137 |
> Irvington NY 10533 USA | http://www.nevis.columbia.edu/~seligman/
>
>
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--
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