Which two statements are true about OCFS2 heartbeats?
A.
A local heartbeat is started during cluster online and stopped during cluster offline commands.
B.
Only one heartbeat mode can be active at a time.
C.
A local heartbeat refers to disk heartbeatingon all shared devices.
D.
A local heartbeat is strongly recommended for clusters having a large number of mounted file systems.
E.
A list of heartbeat devices is stored in the/etc/sysctl.conffile.
F.
Heartbeat mode can be configured at the file system level.
Explanation:
Reference:https://oss.oracle.com/projects/ocfs2/dist/documentation/v1.8/ocfs2-1_8_2-manpages.pdf
B,C
B, C
* Local heartbeat refers to disk heartbeating on all shared devices. In this
mode, the heartbeat is started during mount and stopped during
umount. This mode is easy to setup as it does not require configuring
heartbeat devices.
* Only one heartbeat mode can be active at any one time.
* The list of global heartbeat devices (UUIDs) is stored in
/etc/ocfs2/cluster.conf
* In LOCAL HEARTBEAT mode, the cluster stack heartbeats on all mounted
volumes. Thus, one does not have to specify heartbeat devices in
cluster.conf.
* In Global Heartbeat mode, the heartbeat is started when the cluster is
onlined and stopped when the cluster is offlined.