[Cluster-devel] cluster/cman/man qdisk.5
lhh at sourceware.org
lhh at sourceware.org
Wed Nov 14 16:37:12 UTC 2007
CVSROOT: /cvs/cluster
Module name: cluster
Branch: RHEL5
Changes by: lhh at sourceware.org 2007-11-14 16:37:12
Modified files:
cman/man : qdisk.5
Log message:
Fix #317561 - pass 1
Patches:
http://sourceware.org/cgi-bin/cvsweb.cgi/cluster/cman/man/qdisk.5.diff?cvsroot=cluster&only_with_tag=RHEL5&r1=1.3.2.4&r2=1.3.2.5
--- cluster/cman/man/qdisk.5 2007/03/20 19:37:04 1.3.2.4
+++ cluster/cman/man/qdisk.5 2007/11/14 16:37:11 1.3.2.5
@@ -1,6 +1,6 @@
-.TH "QDisk" "5" "20 Feb 2007" "" "Cluster Quorum Disk"
+.TH "QDisk" "5" "06 Sep 2007" "" "Cluster Quorum Disk"
.SH "NAME"
-QDisk 1.2 \- a disk-based quorum daemon for CMAN / Linux-Cluster
+QDisk 1.2.1 \- a disk-based quorum daemon for CMAN / Linux-Cluster
.SH "1. Overview"
.SH "1.1 Problem"
In some situations, it may be necessary or desirable to sustain
@@ -73,7 +73,8 @@
* Cluster node IDs must be statically configured in cluster.conf and
must be numbered from 1..16 (there can be gaps, of course).
-* Cluster node votes should be more or less equal.
+* Cluster nodes must have one vote each. The effects of nodes having
+any number of votes besides 1 has not been explored.
* CMAN must be running before the qdisk program can operate in full
capacity. If CMAN is not running, qdisk will wait for it.
@@ -83,10 +84,10 @@
failure + load spike situation.
* For 'all-but-one' failure operation, the total number of votes assigned
-to the quorum device should be equal to or greater than the total number
-of node-votes in the cluster. While it is possible to assign only one
-(or a few) votes to the quorum device, the effects of doing so have not
-been explored.
+to the quorum device should be equal to the number of nodes in the cluster
+minus 1. For example, if you have 3 nodes in the cluster, each node should
+get one vote and qdisk should get 2 votes. This then lets the cluster
+operate without qdisk if all nodes are online for testing and other purposes.
* For 'tiebreaker' operation in a two-node cluster, unset CMAN's two_node
flag (or set it to 0), set CMAN's expected votes to '3', set each node's
@@ -338,6 +339,13 @@
on every block device found, comparing the label against the specified
label. This is useful in configurations where the block device name
differs on a per-node basis.
+
+.in 9
+\fIcman_label\fP\fB="\fPmylabel\fB"/>\fP
+.in 12
+This overrides the label advertised to CMAN if present. If specified,
+the quorum daemon will register with this name instead of the actual
+device name.
.in 8
\fB...>\fP
.in 0
More information about the Cluster-devel
mailing list