1FENCE_AGENT(8) System Manager's Manual FENCE_AGENT(8)
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7 fence_scsi - Fence agent for SCSI persistent reservation
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10 fence_scsi is an I/O fencing agent that uses SCSI-3 persistent reserva‐
11 tions to control access to shared storage devices. These devices must
12 support SCSI-3 persistent reservations (SPC-3 or greater) as well as
13 the "preempt-and-abort" subcommand. The fence_scsi agent works by hav‐
14 ing each node in the cluster register a unique key with the SCSI
15 device(s). Once registered, a single node will become the reservation
16 holder by creating a "write exclusive, registrants only" reservation on
17 the device(s). The result is that only registered nodes may write to
18 the device(s). When a node failure occurs, the fence_scsi agent will
19 remove the key belonging to the failed node from the device(s). The
20 failed node will no longer be able to write to the device(s). A manual
21 reboot is required.
22 fence_scsi accepts options on the command line as well as from stdin.
24 Fenced sends parameters through stdin when it execs the agent.
25 fence_scsi can be run by itself with command line options. This is
26 useful for testing and for turning outlets on or off from scripts.
27 Vendor URL:
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31 -o, --action=[action]
34 Fencing action (Default Value: off)
35 -a, --aptpl
37 Use the APTPL flag for registrations. This option is only used
38 for the 'on' action.
39 -d, --devices=[devices]
41 List of devices to use for current operation. Devices can be
42 comma-separated list of raw devices (eg. /dev/sdc). Each device
43 must support SCSI-3 persistent reservations.
44 -k, --key=[key]
46 Key to use for the current operation. This key should be unique
47 to a node. For the "on" action, the key specifies the key use to
48 register the local node. For the "off" action, this key speci‐
49 fies the key to be removed from the device(s).
50 -n, --plug=[nodename]
52 Name of the node to be fenced. The node name is used to generate
53 the key value used for the current operation. This option will
54 be ignored when used with the -k option. This parameter is
55 always required.
56 -f, --logfile
58 Log output (stdout and stderr) to file
59 -q, --quiet
61 Disable logging to stderr. Does not affect --verbose or --debug-
62 file or logging to syslog.
63 -v, --verbose
65 Verbose mode
66 -D, --debug-file=[debugfile]
68 Write debug information to given file
69 -V, --version
71 Display version information and exit
72 -h, --help
74 Display help and exit
75 --delay=[seconds]
77 Wait X seconds before fencing is started (Default Value: 0)
78 --login-timeout=[seconds]
81 Wait X seconds for cmd prompt after login (Default Value: 5)
82 --power-timeout=[seconds]
85 Test X seconds for status change after ON/OFF (Default Value:
86 20)
87 --power-wait=[seconds]
89 Wait X seconds after issuing ON/OFF (Default Value: 0)
90 --shell-timeout=[seconds]
92 Wait X seconds for cmd prompt after issuing command (Default
93 Value: 3)
94 --retry-on=[attempts]
96 Count of attempts to retry power on (Default Value: 1)
97 --corosync-cmap-path=[path]
99 Path to corosync-cmapctl binary (Default Value:
100 /usr/sbin/corosync-cmapctl)
101 --sg_persist-path=[path]
103 Path to sg_persist binary (Default Value: /usr/bin/sg_persist)
104 --sg_turs-path=[path]
107 Path to sg_turs binary (Default Value: /usr/bin/sg_turs)
108 --vgs-path=[path]
110 Path to vgs binary (Default Value: /usr/sbin/vgs)
111
114 on Power on machine.
117 off Power off machine.
119 status This returns the status of the plug/virtual machine.
121 monitor
123 Check the health of fence device
124 metadata
126 Display the XML metadata describing this resource.
127 manpage
129 The operational behavior of this is not known.
130 validate-all
132 Validate if all required parameters are entered.
133
136 action Fencing action (Default Value: off)
139 aptpl Use the APTPL flag for registrations. This option is only used
141 for the 'on' action.
142 devices
144 List of devices to use for current operation. Devices can be
145 comma-separated list of raw devices (eg. /dev/sdc). Each device
146 must support SCSI-3 persistent reservations.
147 key Key to use for the current operation. This key should be unique
149 to a node. For the "on" action, the key specifies the key use to
150 register the local node. For the "off" action, this key speci‐
151 fies the key to be removed from the device(s).
152 plug Name of the node to be fenced. The node name is used to generate
154 the key value used for the current operation. This option will
155 be ignored when used with the -k option. This parameter is
156 always required. Obsoletes: port
157 logfile
159 Log output (stdout and stderr) to file
160 quiet Disable logging to stderr. Does not affect --verbose or --debug-
162 file or logging to syslog.
163 verbose
165 Verbose mode
166 debug_file
168 Write debug information to given file Obsoletes: debug
169 version
171 Display version information and exit
172 help Display help and exit
174 delay Wait X seconds before fencing is started (Default Value: 0)
176 login_timeout
179 Wait X seconds for cmd prompt after login (Default Value: 5)
180 power_timeout
183 Test X seconds for status change after ON/OFF (Default Value:
184 20)
185 power_wait
187 Wait X seconds after issuing ON/OFF (Default Value: 0)
188 shell_timeout
190 Wait X seconds for cmd prompt after issuing command (Default
191 Value: 3)
192 retry_on
194 Count of attempts to retry power on (Default Value: 1)
195 corosync_cmap_path
197 Path to corosync-cmapctl binary (Default Value:
198 /usr/sbin/corosync-cmapctl)
199 sg_persist_path
201 Path to sg_persist binary (Default Value: /usr/bin/sg_persist)
202 sg_turs_path
205 Path to sg_turs binary (Default Value: /usr/bin/sg_turs)
206 vgs_path
208 Path to vgs binary (Default Value: /usr/sbin/vgs)
209fence_scsi (Fence Agent) 2009-10-20 FENCE_AGENT(8)