Would like a little bit of help understanding the Cluster Aliasing
subsystem in V5.1. We are having some problems and I fear they might
be fallout from incorrect implementation on our part.
We have a 6 node V5.1 Cluster. 2 of the nodes are the larger size
systems(Have more system resources) and hence we run our Database on
one of these nodes(Node A) and the SAP Central instance on the other
node(Node B). There is also a rather large filesystem that is hosted
on Node B as well. All three are CAA resources and we have cluster
aliases associated with these. In the /etc/clu_alias.config file for
Node A & B we have the following entries -
/usr/sbin/cluamgr -a selw=3,selp=1,join,alias=DEFAULTALIAS
/usr/sbin/cluamgr -a alias=p01ap01,join,rpri=2,selw=0
/usr/sbin/cluamgr -a alias=p01db01,join,rpri=2,selw=0
/usr/sbin/cluamgr -a alias=prdfs01,join,rpri=2,selw=0
The first being the default Cluster Alias and the rest being the three
resouces. When the caa scripts kick in, they change the "selw" for the
respective cluster alias to 1 on that particular node. As a result the
system ends up hosting the service/resource/alias. The other 4 nodes
in the cluster are never going to host either one of these resources
and hence the only entry that they have in their /etc/clu_alias.config
file is the one for the default cluster alias which is put in there by
the clu_add_member script.
We did have problems with the cluster aliases not responding and as a
result applied the "Network - Cluster Aliasing" patches which have
been since included in PK 4. But about a weekend ago, I had one of the
other nodes crash and ended up having aliasing issues again. I could
ping all three aliases from this particular system and could get "rsh"
commands to work with prdfs01 but the other two aliases - "p01ap01 &
p01db01" would not respond. I got around this problem by making this
system join the two aliases with a selw=0 using the cluamgr command.
Have we implemented this incorrectly somehow? Do I need to have all
three aliases defined in each systems /etc/clu_alias.config file
regardless? What's the supported/recommended thing to do?
Tks & Rgds,
Alay Shah
Allegiance Healthcare Corporation
1400 Waukegan Rd.
McGaw Park, IL 60085
Ph - 847-578-2584
Fax- 847-578-5586
Email - shahal_at_allegiance.net
Received on Thu Jan 03 2002 - 17:00:18 NZDT