[Linux-ha-dev] Ordering of clones; does it work?

[Ulrich Windl]

Hi!

I had thought ordrring of clones would work, but it looks like it does not in current SLES11 SP3 (1.1.11-3ca8c3b):
I have rules like:
order ord_DLM_cLVMd inf: cln_DLM cln_cLVMd
order ord_DLM_O2CB inf: cln_DLM cln_O2CB
order ord_DLM_cLVMd inf: cln_DLM cln_cLVMd
colocation col_O2CB_DLM inf: cln_O2CB cln_DLM
colocation col_cLVMd_DLM inf: cln_cLVMd cln_DLM

I thought the instances on one node would start DLM first, then in parallel (optimally) O2CB and cLVMd.
When adding a new node to the cluster, all three instances were started at the same time:
Nov 25 12:37:18 h05 pengine[15681]: notice: LogActions: Start prm_cLVMd:2 (h10)
Nov 25 12:37:18 h05 pengine[15681]: notice: LogActions: Start prm_LVM_CFS_VMs:2 (h10)
Nov 25 12:37:18 h05 pengine[15681]: notice: LogActions: Start prm_O2CB:2 (h10)
Nov 25 12:37:18 h05 pengine[15681]: notice: LogActions: Start prm_CFS_VMs_fs:2 (h10)

So did I do something wrong, or doesn't ordering of clones work?

Regards,
Ulrich


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[Lars Marowsky-Bree]

Post by Ulrich Windl
Hi!
order ord_DLM_O2CB inf: cln_DLM cln_O2CB
order ord_DLM_cLVMd inf: cln_DLM cln_cLVMd
colocation col_O2CB_DLM inf: cln_O2CB cln_DLM
colocation col_cLVMd_DLM inf: cln_cLVMd cln_DLM
I thought the instances on one node would start DLM first, then in parallel (optimally) O2CB and cLVMd.

Correct.

Post by Ulrich Windl
Nov 25 12:37:18 h05 pengine[15681]: notice: LogActions: Start prm_cLVMd:2 (h10)
Nov 25 12:37:18 h05 pengine[15681]: notice: LogActions: Start prm_LVM_CFS_VMs:2 (h10)
Nov 25 12:37:18 h05 pengine[15681]: notice: LogActions: Start prm_O2CB:2 (h10)
Nov 25 12:37:18 h05 pengine[15681]: notice: LogActions: Start prm_CFS_VMs_fs:2 (h10)

This is the PE *scheduling* the resources to be started. It's not the
actual ordering. It's just telling you that the resources will be
started during this transition.

You need to check either the transition graph (crm configure simulate),
or look at the actual sequence of commands the LRM executes.


Regards,
Lars