Hello,
I am newbie with pacemaker (and, generally, with ha clusters). I have
configured a two nodes cluster. Both nodes are virtual machines (vmware
esx) and use a shared storage (provided by a SAN, although access to the
SAN is from esx infrastructure and VM consider it as scsi disk). I have
configured clvm so logical volumes are only active in one of the nodes.
Now I need some help with the stonith configuration to avoid data
corrumption. Since I'm using ESX virtual machines, I think I won't have
any problem using external/vcenter stonith plugin to shutdown virtual
machines.
My problem is how to avoid split brain situation with this
configuration, without configuring a 3rd node. I have read about quorum
disks, external/sbd stonith plugin and other references, but I'm too
confused with all this.
For example, [1] mention techniques to improve quorum with scsi reserve
or quorum daemon, but it didn't point to how to do this pacemaker. Or
[2] talks about external/sbd.
Any help?
PS: I have attached my corosync.conf and crm configure show outputs
[1]
http://techthoughts.typepad.com/managing_computers/2007/10/split-brain-quo.html
[2] http://www.gossamer-threads.com/lists/linuxha/pacemaker/78887
--
Angel L. Mateo Martínez
Sección de Telemática
Área de Tecnologías de la Información
y las Comunicaciones Aplicadas (ATICA)
http://www.um.es/atica
Tfo: 868889150
Fax: 868888337
# Please read the openais.conf.5 manual page
totem {
version: 2
# How long before declaring a token lost (ms)
token: 3000
# How many token retransmits before forming a new configuration
token_retransmits_before_loss_const: 10
# How long to wait for join messages in the membership protocol (ms)
join: 60
# How long to wait for consensus to be achieved before starting a new
round of membership configuration (ms)
consensus: 3600
# Turn off the virtual synchrony filter
vsftype: none
# Number of messages that may be sent by one processor on receipt of
the token
max_messages: 20
# Limit generated nodeids to 31-bits (positive signed integers)
clear_node_high_bit: yes
# Disable encryption
secauth: off
# How many threads to use for encryption/decryption
threads: 0
# Optionally assign a fixed node id (integer)
# nodeid: 1234
# This specifies the mode of redundant ring, which may be none, active,
or passive.
rrp_mode: none
interface {
# The following values need to be set based on your environment
ringnumber: 0
bindnetaddr: 155.54.211.160
mcastaddr: 226.94.1.1
mcastport: 5405
}
}
amf {
mode: disabled
}
service {
# Load the Pacemaker Cluster Resource Manager
ver: 1
name: pacemaker
}
aisexec {
user: root
group: root
}
logging {
fileline: off
to_stderr: yes
to_logfile: no
to_syslog: yes
syslog_facility: daemon
debug: off
timestamp: on
logger_subsys {
subsys: AMF
debug: off
tags: enter|leave|trace1|trace2|trace3|trace4|trace6
}
}
node myotis51
node myotis52
primitive clvm ocf:lvm2:clvmd \
params daemon_timeout="30" \
meta target-role="Started"
primitive dlm ocf:pacemaker:controld \
meta target-role="Started"
primitive vg_users1 ocf:heartbeat:LVM \
params volgrpname="UsersDisk" exclusive="yes" \
op monitor interval="60" timeout="60"
group dlm-clvm dlm clvm
clone dlm-clvm-clone dlm-clvm \
meta interleave="true" ordered="true" target-role="Started"
location cli-prefer-vg_users1 vg_users1 \
rule $id="cli-prefer-rule-vg_users1" inf: #uname eq myotis52
property $id="cib-bootstrap-options" \
dc-version="1.1.6-9971ebba4494012a93c03b40a2c58ec0eb60f50c" \
cluster-infrastructure="openais" \
expected-quorum-votes="2" \
stonith-enabled="false" \
no-quorum-policy="ignore" \
last-lrm-refresh="1364212376"
rsc_defaults $id="rsc-options" \
resource-stickiness="100"
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