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hacmp in a 7 node configuration ?


 
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Operating Systems AIX hacmp in a 7 node configuration ?
# 8  
Old 08-30-2009
Hi Shockneck,

many many thanks for your reply. You have answered all my questions so far.
- DBAs don't have root access to the cluster
- only 2 SAs will have root access - me and my backup - and we will both build the cluster together
- we have a very strong change control in place and our documentation is pretty good
- we are aware this is no 24/7/365 solution - that is why we have an independant DR recovery site and a uat environment for testing
- the A1-A5 servers + 1 spare are running right now in a VCS cluster on AIX ... our engineering doesnt support it past 9/2010 - that is basically why we're going to move it to hacmp
- we will have almost a year for build and testing
- we have a weekend greenzone of 36 hrs for the environment and always patch all nodes in any cluster at the same time
- we will have hartbeat on disk on at least 2 different mini-devicegroups as you suggested

Once more thank you for all your suggestions - I will keep you in the loop if problems arise as I can see you don't have any major objection Smilie

Thank you in addition for the EMC bug tip - this explains why we have the problems on the 2 node clusters ... our SAN engineering is probably aware but has not yet certified the fix - I will ask them on monday for the fix.

Kind regards
zxmaus

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VOTEQUORUM_LEAVING(3)				    Corosync Cluster Engine Programmer's Manual 			     VOTEQUORUM_LEAVING(3)

NAME
votequorum_leaving - Tell other nodes that we are leaving the cluster SYNOPSIS
#include <corosync/votequorum.h> int votequorum_leaving(votequorum_handle_t handle); DESCRIPTION
The votequorum_leaving function is used to tell the other nodes in the cluster that this node is leaving. They will (when the node actually leaves) reduce quorum to keep the cluster running without this node. This function should only be called if it is known that the node is being shut down for a known reason and could be out of the cluster for an extended period of time. Normal behaviour is for the cluster to reduce the total number of votes, but NOT expected_votes when a node leave the cluster, so the clus- ter could become inquorate. This is correct behaviour and is ther eto prevent split-brain. Do NOT call this function unless you know what you are doing. RETURN VALUE
This call returns the CS_OK value if successful, otherwise an error is returned. ERRORS
The errors are undocumented. SEE ALSO
votequorum_overview(8), votequorum_initialize(3), votequorum_finalize(3), votequorum_dispatch(3), votequorum_fd_get(3), corosync Man Page 2009-01-26 VOTEQUORUM_LEAVING(3)

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