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# Description: Enables/Disables SCSI devices to protect them from being
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# Author: Alan Robertson
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# Support: linux-ha@lists.linux-ha.org
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# License: GNU General Public License (GPL)
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# Copyright: (C) 2002 - 2005 IBM
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# CAVEATS: See the usage message for some important warnings
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# usage: ./LinuxSCSI (start|stop|status|monitor|meta-data|validate-all|methods)
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# OCF parameters are as below:
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# An example usage in /etc/ha.d/haresources:
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# node1 10.0.0.170 LinuxSCSI:0:0:11
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#######################################################################
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: ${OCF_FUNCTIONS_DIR=${OCF_ROOT}/lib/heartbeat}
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. ${OCF_FUNCTIONS_DIR}/ocf-shellfuncs
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#######################################################################
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PROCSCSI=/proc/scsi/scsi
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usage: $0 (start|stop|status|monitor|meta-data|validate-all|methods)
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$0 manages the availability of a SCSI device from the point
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of view of the linux kernel. It make Linux believe the
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device has gone away, and it can make it come back again.
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The purpose of this resource script is to keep admins from
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accidentally messing with a shared disk that is managed by the
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HA subsystem and is currently owned by the other side.
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To get maximum benefit from this feature, you should (manually)
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disable the resources on boot, and let your HA software enable
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them when it wants to acquire the disk.
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The kernel code says this is potentially dangerous. DO NOT USE
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IT ON AN ACTIVE DEVICE. If the device is inactive, this script
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will make it stay inactive, when given "off". If you inactivate
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the wrong device, you may have to reboot your machine, and your
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On the other hand, at least one RAID controller requires the
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use of this technique for it to work correctly in a failover
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environment - so it is believed that it is more stable in this
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usage than the comments in the code imply.
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Here are the warnings from the kernel source about the "stop"
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operation as of 2.4.10:
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------------------------------
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Consider this feature pre-BETA.
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CAUTION: This is not for hotplugging your peripherals. As
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SCSI was not designed for this, you could damage your
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hardware and thoroughly confuse the SCSI subsystem.
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Similar warnings apply to the "start" operation...
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Consider this feature BETA.
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CAUTION: This is not for hotplugging your peripherals.
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As SCSI was not designed for this you could damage your
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However perhaps it is legal to switch on an already connected
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device. It is perhaps not guaranteed this device doesn't corrupt
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an ongoing data transfer.
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-------------------------
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So, Caveat Emptor, and test this feature thoroughly on
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your kernel and your configuration with real load on the SCSI
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bus before using it in production!
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Another potential trouble spot...
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The order in which you bring up LinuxSCSI resources determines which
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SCSI device they show up as on Linux. If you have two SCSI devices
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in different resource groups they will be brought up asyncronously
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resulting in indeterminate device name assignments. This usually
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happens in an active-active configuration.
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To solve this you probably should use LVM or EVMS to manage these
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volumes. LVM and EVMS solve this problem for you by labels they
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keep in the volumes. If you don't use a reasonable volume manager,
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then you'll have to mount by UUID.
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<?xml version="1.0"?>
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<!DOCTYPE resource-agent SYSTEM "ra-api-1.dtd">
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<resource-agent name="LinuxSCSI">
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<version>1.0</version>
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Deprecation warning: This agent makes use of Linux SCSI hot-plug
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functionality which has been superseded by SCSI reservations. It is
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deprecated and may be removed from a future release. See the
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scsi2reservation and sfex agents for alternatives. --
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This is a resource agent for LinuxSCSI. It manages the availability of a
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SCSI device from the point of view of the linux kernel. It make Linux
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believe the device has gone away, and it can make it come back again.
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<shortdesc lang="en">Enables and disables SCSI devices through the
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kernel SCSI hot-plug subsystem (deprecated)</shortdesc>
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<parameter name="scsi" unique="0" required="1">
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The SCSI instance to be managed.
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<shortdesc lang="en">SCSI instance</shortdesc>
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<content type="string" default="" />
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<parameter name="ignore_deprecation">
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If set to true, suppresses the deprecation warning for this agent.
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<shortdesc lang="en">Suppress deprecation warning</shortdesc>
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<content type="boolean" default="false" />
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<action name="start" timeout="20s" />
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<action name="stop" timeout="20s" />
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<action name="methods" timeout="5" />
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<action name="status" depth="0" timeout="20s" interval="10" />
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<action name="monitor" depth="0" timeout="20s" interval="10" />
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<action name="meta-data" timeout="5" />
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<action name="validate-all" timeout="5" />
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[0-9]*:[0-9]*:[0-9]*);;
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[0-9]*:[0-9]*:[0-9]*:[0-9]*)
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lun=`echo "$1" | cut -d: -f4`;;
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ocf_log err "Invalid SCSI instance $1"
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host=`echo "$1" | cut -d: -f1`
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channel=`echo "$1" | cut -d: -f2`
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target=`echo "$1" | cut -d: -f3`
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# start: Enable the given SCSI device in the kernel
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# [ $target = error ] && exit 1
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# echo "scsi-add-single-device $host $channel $target $lun" >>$PROCSCSI
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echo "scsi add-single-device $host $channel $target $lun" >>$PROCSCSI
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ocf_log err "SCSI device $1 not active!"
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return $OCF_ERR_GENERIC
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# stop: Disable the given SCSI device in the kernel
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# [ $target = error ] && exit 1
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echo "scsi remove-single-device $host $channel $target $lun" >>$PROCSCSI
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ocf_log err "SCSI device $1 still active!"
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return $OCF_ERR_GENERIC
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# status: is the given device now available?
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# [ $target = error ] && exit 1
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[ $channel -eq 0 ] && channel=$zeropat
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[ $target -eq 0 ] && target=$zeropat
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[ $lun -eq 0 ] && lun=$zeropat
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greppat="Host: *scsi$host *Channel: *$channel *Id: *$target *Lun: *$lun"
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grep -i "$greppat" $PROCSCSI >/dev/null
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if [ $? -eq 0 ]; then
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return $OCF_NOT_RUNNING
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# validate_all: Check the OCF instance parameters
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scsi_validate_all() {
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ocf_log err "Parameter number error."
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exit $OCF_ERR_GENERIC
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# [ -z "$OCF_RESKEY_scsi" ] && [ "X$1" = "Xmethods" ]
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methods) scsi_methods
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# Be obnoxious, log deprecation warning on every invocation (unless
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# suppressed by resource configuration).
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[ -z "$OCF_RESKEY_scsi" ]
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ocf_log err "You have to set a valid scsi id at least!"
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exit $OCF_ERR_GENERIC
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instance=$OCF_RESKEY_scsi
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start) scsi_start $instance
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stop) scsi_stop $instance
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scsi_status $instance
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ocf_log info "SCSI device $instance is running"
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ocf_log info "SCSI device $instance is stopped"
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exit $OCF_NOT_RUNNING
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validate-all) scsi_validate_all
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exit $OCF_ERR_UNIMPLEMENTED
added
removed
heartbeat/LinuxSCSI
