1/etc/sysconfig/o2cb(5) OCFS2 Manual Pages /etc/sysconfig/o2cb(5)
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6 /etc/sysconfig/o2cb - Cluster configuration file for the o2cb cluster
7 stack.
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10 The configuration file /etc/sysconfig/o2cb stores the active cluster
11 stack, its name and the various cluster timeouts for the o2cb cluster
12 stack.
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16 This file can be populated using the o2cb init script. An example of
17 the same is illustrated in the examples section.
18 The list of configurable parameters in this file are:
20 O2CB_STACK
23 Name of the cluster stack. The possible values are o2cb, pcmk
24 and cman. o2cb is the default cluster stack of the OCFS2 file
25 system. pcmk (Pacemaker) and cman (rgmanager) are the two other
26 cluster stacks that are supported by the same file system.
27 O2CB_BOOTCLUSTER
30 Name of the active cluster. While /etc/ocfs2/cluster.conf can
31 hold descriptions of multiple clusters, only one can be active
32 at any one time. The name of that active cluster is specified
33 here. The name itself can be upto 16 alphanumeric characters
34 [0-9A-Za-z] with no special characters.
35 The remaining configurable parameters (cluster timeouts) are only rele‐
37 vant for the o2cb cluster stack. These cluster timeouts are used by the
38 o2cb cluster stack to determine whether a node is dead or alive. The
39 default timeouts are just a guide and may need to be tweaked depending
40 on the hardware the software is running on.
41 The various cluster timeouts for the o2cb cluster stack are:
43 O2CB_HEARTBEAT_THRESHOLD
45 The disk heartbeat timeout is the number of two second itera‐
46 tions before a node is considered dead. The exact formula used
47 to convert the timeout in seconds to the number of iterations is
48 as follows:
49 O2CB_HEARTBEAT_THRESHOLD = (((timeout in seconds) / 2) + 1)
51 For example, to specify a 60 sec timeout, set it to 31. For 120
53 secs, set it to 61. The default for this timeout is 60 secs
54 (O2CB_HEARTBEAT_THRESHOLD = 31).
55 While it defaults to 60 secs, multipath users typically set it
57 to 120 secs.
58 O2CB_IDLE_TIMEOUT_MS
61 The network idle timeout specifies the time in milliseconds
62 before a network connection is considered dead. While it
63 defaults to 30000 ms, network bonding users typically set it to
64 60000 ms.
65 O2CB_KEEPALIVE_DELAY_MS
68 The network keepalive specifies the maximum delay in millisec‐
69 onds before a keepalive packet is sent to another node to check
70 whether it is alive or not. It defaults to 2000 ms.
71 O2CB_RECONNECT_DELAY_MS
74 The network reconnect specifies the minimum delay in millisec‐
75 onds between repeated connect attempts. It defaults to 2000 ms.
76
78 The example below illustrates populating the o2cb sysconfig file using
79 the o2cb init script.
80 $ service o2cb configure
83 Configuring the O2CB driver.
84 This will configure the on-boot properties of the O2CB driver.
86 The following questions will determine whether the driver is loaded on
87 boot. The current values will be shown in brackets ('[]'). Hitting
88 <ENTER> without typing an answer will keep that current value. Ctrl-C
89 will abort.
90 Load O2CB driver on boot (y/n) [n]: y
92 Cluster stack backing O2CB [o2cb]:
93 Cluster to start on boot (Enter "none" to clear) [ocfs2]: webcluster
94 Specify heartbeat dead threshold (>=7) [31]: 62
95 Specify network idle timeout in ms (>=5000) [30000]: 60000
96 Specify network keepalive delay in ms (>=1000) [2000]:
97 Specify network reconnect delay in ms (>=2000) [2000]:
98 Writing O2CB configuration: OK
99 $ cat /etc/sysconfig/o2cb
102 #
103 # This is a configuration file for automatic startup of the O2CB
104 # driver. It is generated by running /etc/init.d/o2cb configure.
105 # On Debian based systems the preferred method is running
106 # 'dpkg-reconfigure ocfs2-tools'.
107 #
108 # O2CB_ENABLED: 'true' means to load the driver on boot.
110 O2CB_ENABLED=true
111 # O2CB_STACK: The name of the cluster stack backing O2CB.
113 O2CB_STACK=o2cb
114 # O2CB_BOOTCLUSTER: If not empty, the name of a cluster to start.
116 O2CB_BOOTCLUSTER=webcluster
117 # O2CB_HEARTBEAT_THRESHOLD: Iterations before a node is considered dead.
119 O2CB_HEARTBEAT_THRESHOLD=62
120 # O2CB_IDLE_TIMEOUT_MS: Time in ms before a network connection is considered dead.
122 O2CB_IDLE_TIMEOUT_MS=60000
123 # O2CB_KEEPALIVE_DELAY_MS: Max time in ms before a keepalive packet is sent
125 O2CB_KEEPALIVE_DELAY_MS=2000
126 # O2CB_RECONNECT_DELAY_MS: Min time in ms between connection attempts
128 O2CB_RECONNECT_DELAY_MS=2000
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132 o2cb(7) o2cb(8) ocfs2.cluster.conf(5)
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140 Copyright © 2004, 2012 Oracle. All rights reserved.
141Version 1.8.5 January 2012 /etc/sysconfig/o2cb(5)