----- Original Message -----
> From: "Ulrich Windl" <[email protected]>
> To: [email protected]
> Sent: Monday, April 15, 2013 1:39:34 AM
> Subject: [Linux-HA] Q: limiting parallel execution of resource actions
>
> Hi!
>
> I have a wuestion: If I want to limit parallel execution of some resources,
> how can I configure that?
>
> Background: Some resources may hit some OS bug when demanding high I/O (e.g.
> starting several Xen-VMs residing on a OCFS2 filesystem that is mirrored by
> cLVM). The I/O performance will drop approximately to zero when cLVM is also
> mirroring. That's not because of the I/O channel being saturated, but
> because of terrible programming regarding cLVM... anyway:
>
> Would it work to define an advisory ordering of resources (in addition to a
> different mandatory ordering), so if crm would schedule alle those resources
> at one (in parallel), it would actually schedule the sequentially?
>
> If I stop one resource, will those "logically after" the one being stopped be
> also stopped due to advisory ordering then?
>
> Maybe a new mechanism is needed to restrict parallelism based on resources
> (i.e. a new type of constraint).
hey,
'batch-limit' cluster option might help.
http://clusterlabs.org/doc/en-US/Pacemaker/1.1-pcs/html-single/Pacemaker_Explained/index.html#_available_cluster_options
-- Vossel
> Regards,
> Ulrich
>
>
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