[Pacemaker] group resource - altering default order

[Nicolaas Stuyt]

Thank you for pointing me at this discussion thread. The configuration
did help me to achieve what I was looking for. Now though I wonder if I
should because of the threads end-point comment.
 
Any idea what the background explanation may be for the comment:
"an unordered and/or uncolocated groups are an abomination"
 
The thread stops with:
-------------------------
Unordered and/or uncolocated groups are an abomination.
Is that enough light?
-------------------------

Nick

>>> Florian Crouzat <gentoo at floriancrouzat.net> 2012-06-14 09:56 >>>
Le 14/06/2012 14:55, Nicolaas Stuyt a écrit :
> Hello,
> Is there a way to affect a groups ordering behavior? The default
appears
> to be left to right which I can understand. However if I wish to
create
> a group of "like primitives" and not primitives who are dependant on
> each other - for example a list of (ocf::heartbeat:Filesystem)
> primitives - then I care less about the order. I was hoping to
specify a
> meta characteristic like "lazy" I guess; something like meta
> order="lazy" or "not-applicable". This ordering behavior seems to
exist
> in colocation as well.
> What I wish to achieve is to take a file system resource down - say
for
> maintenance and then allow it to come back when maintenance is
completed
> without affecting the other Filesystem primitives down the list.
> To provide a visual illustration of this I created a cloned group of
> dummies using (ocf::pacemaker:Dummy) and I have stopped just the
last
> dummy primitive:
> Clone Set: cl_dummies [grp_dummies]
> Resource Group: grp_dummies:0
> dummy1:0 (ocf::pacemaker:Dummy): Started node1
> dummy2:0 (ocf::pacemaker:Dummy): Started node1
> dummy3:0 (ocf::pacemaker:Dummy): Started node1
> dummy4:0 (ocf::pacemaker:Dummy): Started node1
> dummy5:0 (ocf::pacemaker:Dummy): Stopped
> Resource Group: grp_dummies:1
> dummy1:1 (ocf::pacemaker:Dummy): Started node2
> dummy2:1 (ocf::pacemaker:Dummy): Started node2
> dummy3:1 (ocf::pacemaker:Dummy): Started node2
> dummy4:1 (ocf::pacemaker:Dummy): Started node2
> dummy5:1 (ocf::pacemaker:Dummy): Stopped
> When all are running crm_mon presents as:
> Clone Set: cl_dummies [grp_dummies]
> Started: [ node1 node2]
> What I want to achieve is to take a middle dummy primitive out but
leave
> the rest running. When I do that - for example on dummy3; dummies 4
and
> 5 also get taken out such that I am left with this:
> Clone Set: cl_dummies [grp_dummies]
> Resource Group: grp_dummies:0
> dummy1:0 (ocf::pacemaker:Dummy): Started node1
> dummy2:0 (ocf::pacemaker:Dummy): Started node1
> dummy3:0 (ocf::pacemaker:Dummy): Stopped
> dummy4:0 (ocf::pacemaker:Dummy): Stopped
> dummy5:0 (ocf::pacemaker:Dummy): Stopped
> Resource Group: grp_dummies:1
> dummy1:1 (ocf::pacemaker:Dummy): Started node2
> dummy2:1 (ocf::pacemaker:Dummy): Started node2
> dummy3:1 (ocf::pacemaker:Dummy): Stopped
> dummy4:1 (ocf::pacemaker:Dummy): Stopped
> dummy5:1 (ocf::pacemaker:Dummy): Stopped
> What I would like is this:
> Clone Set: cl_dummies [grp_dummies]
> Resource Group: grp_dummies:0
> dummy1:0 (ocf::pacemaker:Dummy): Started node1
> dummy2:0 (ocf::pacemaker:Dummy): Started node1
> dummy3:0 (ocf::pacemaker:Dummy): Stopped
> dummy4:0 (ocf::pacemaker:Dummy): Started node1
> dummy5:0 (ocf::pacemaker:Dummy): Started node1
> Resource Group: grp_dummies:1
> dummy1:1 (ocf::pacemaker:Dummy): Started node2
> dummy2:1 (ocf::pacemaker:Dummy): Started node2
> dummy3:1 (ocf::pacemaker:Dummy): Stopped
> dummy4:1 (ocf::pacemaker:Dummy): Started node2
> dummy5:1 (ocf::pacemaker:Dummy): Started node2
> A work around I have considered is to edit the group and resort the
list
> so that the Filesystem primitive I'm interested in working on is
named
> last but I wonder if I'll remember ;-) to do that the next time I
need
> to perform maintenance.
> Or is there a better way to do this that I have not been introduced
too yet?
> Regards,
> Nick

It's already been discussed a couple times.
See 
http
://oss.clusterlabs.org/pipermail/pacemaker/2011-March/009435.html 
and follow link/answers.

-- 
Cheers,
Florian Crouzat

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