292 lines
6.7 KiB
Bash
Executable File
292 lines
6.7 KiB
Bash
Executable File
#!/bin/bash
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#
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# vdev_id: udev helper to generate user-friendly names for JBOD disks
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#
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# This script parses the file /etc/zfs/vdev_id.conf to map a
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# physical path in a storage topology to a channel name. The
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# channel name is combined with a disk enclosure slot number to
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# create an alias that reflects the physical location of the drive.
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# This is particularly helpful when it comes to tasks like replacing
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# failed drives. Slot numbers may also be re-mapped in case the
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# default numbering is unsatisfactory. The drive aliases will be
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# created as symbolic links in /dev/disk/by-vdev.
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#
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# The only currently supported topologies are sas_direct and
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# sas_switch. A multipath mode is supported in which dm-mpath
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# devices are handled by examining the first-listed running
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# component disk. In multipath mode the configuration file
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# should contain a channel definition with the same name for
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# each path to a given enclosure.
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#
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# Some example configuration files are given below.
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# #
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# # Example vdev_id.conf - sas_direct.
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# #
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#
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# multipath no
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# topology sas_direct
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# phys_per_port 4
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#
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# # PCI_ID HBA PORT CHANNEL NAME
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# channel 85:00.0 1 A
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# channel 85:00.0 0 B
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# channel 86:00.0 1 C
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# channel 86:00.0 0 D
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#
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# # Linux Mapped
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# # Slot Slot
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# slot 1 7
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# slot 2 10
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# slot 3 3
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# slot 4 6
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# slot 5 2
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# slot 6 8
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# slot 7 1
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# slot 8 4
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# slot 9 9
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# slot 10 5
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# #
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# # Example vdev_id.conf - sas_switch
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# #
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#
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# topology sas_switch
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#
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# # SWITCH PORT CHANNEL NAME
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# channel 1 A
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# channel 2 B
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# channel 3 C
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# channel 4 D
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# #
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# # Example vdev_id.conf - multipath
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# #
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#
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# multipath yes
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#
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# # PCI_ID HBA PORT CHANNEL NAME
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# channel 85:00.0 1 A
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# channel 85:00.0 0 B
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# channel 86:00.0 1 A
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# channel 86:00.0 0 B
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PATH=/bin:/sbin:/usr/bin:/usr/sbin
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CONFIG=/etc/zfs/vdev_id.conf
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PHYS_PER_PORT=
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DEV=
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SLOT_MAP=
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CHANNEL_MAP=
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MULTIPATH=
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TOPOLOGY=
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declare -i i j
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usage() {
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cat << EOF
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Usage: vdev_id [-h]
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vdev_id <-d device> [-c config_file] [-p phys_per_port]
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[-g sas_direct|sas_switch] [-m]
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-c specify name of alernate config file [default=$CONFIG]
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-d specify basename of device (i.e. sda)
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-g Storage network topology [default="$TOPOLOGY"]
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-m Run in multipath mode
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-p number of phy's per switch port [default=$PHYS_PER_PORT]
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-h show this summary
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EOF
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exit 0
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}
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map_slot() {
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local LINUX_SLOT=$1
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local MAPPED_SLOT=
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MAPPED_SLOT=`awk "/^slot / && \\$2 == ${LINUX_SLOT} \
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{ print \\$3; exit }" $CONFIG`
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if [ -z "$MAPPED_SLOT" ] ; then
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MAPPED_SLOT=$LINUX_SLOT
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fi
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printf "%d" ${MAPPED_SLOT}
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}
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map_channel() {
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local MAPPED_CHAN=
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local PCI_ID=$1
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local PORT=$2
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case $TOPOLOGY in
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"sas_switch")
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MAPPED_CHAN=`awk "/^channel / && \\$2 == ${PORT} \
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{ print \\$3; exit }" $CONFIG`
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;;
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"sas_direct")
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MAPPED_CHAN=`awk "/^channel / && \\$2 == \"${PCI_ID}\" && \
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\\$3 == ${PORT} { print \\$4; exit }" \
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$CONFIG`
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;;
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esac
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printf "%s" ${MAPPED_CHAN}
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}
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while getopts 'c:s:d:g:mp:h' OPTION; do
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case ${OPTION} in
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c)
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CONFIG=`readlink -e ${OPTARG}`
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;;
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d)
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DEV=${OPTARG}
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;;
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g)
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TOPOLOGY=$OPTARG
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;;
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p)
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PHYS_PER_PORT=${OPTARG}
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;;
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m)
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MULTIPATH_MODE=yes
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;;
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s)
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SLOT_MAP=`readlink -e ${OPTARG}`
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if [ ! -r $SLOT_MAP ] ; then
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echo "Error: $SLOT_MAP is nonexistant or unreadable"
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exit 1
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fi
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;;
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h)
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usage
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;;
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esac
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done
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if [ ! -r $CONFIG ] ; then
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exit 0
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fi
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if [ -z "$DEV" ] ; then
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echo "Error: missing required option -d"
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exit 1
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fi
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if [ -z "$TOPOLOGY" ] ; then
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TOPOLOGY=`awk "/^topology /{print \\$2; exit}" $CONFIG`
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fi
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TOPOLOGY=${TOPOLOGY:-sas_direct}
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case $TOPOLOGY in
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sas_direct|sas_switch)
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;;
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*)
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echo "Error: unknown topology $TOPOLOGY"
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exit 1
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;;
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esac
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if [ -z "$PHYS_PER_PORT" ] ; then
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PHYS_PER_PORT=`awk "/^phys_per_port /{print \\$2; exit}" $CONFIG`
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fi
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PHYS_PER_PORT=${PHYS_PER_PORT:-4}
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if ! echo $PHYS_PER_PORT | egrep -q '^[0-9]+$' ; then
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echo "Error: phys_per_port value $PHYS_PER_PORT is non-numeric"
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exit 1
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fi
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if [ -z "$MULTIPATH_MODE" ] ; then
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MULTIPATH_MODE=`awk "/^multipath /{print \\$2; exit}" $CONFIG`
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fi
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# Use first running component device if we're handling a dm-mpath device.
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if [ "$MULTIPATH_MODE" = "yes" ] ; then
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# If udev didn't tell us the UUID via DM_NAME, find it in /dev/mapper
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if [ -z "$DM_NAME" ] ; then
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DM_NAME=`ls -l --full-time /dev/mapper |
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awk "/\/$DEV$/{print \\$9}"`
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fi
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# For raw disks udev exports DEVTYPE=partition when handling partitions,
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# and the rules can be written to take advantage of this to append a
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# -part suffix. For dm devices we get DEVTYPE=disk even for partitions
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# so we have to append the -part suffix directly in the helper.
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if [ "$DEVTYPE" != "partition" ] ; then
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PART=`echo $DM_NAME | awk -Fp '/p/{print "-part"$2}'`
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fi
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# Strip off partition information.
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DM_NAME=`echo $DM_NAME | sed 's/p[0-9][0-9]*$//'`
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if [ -z "$DM_NAME" ] ; then
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exit 0
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fi
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# Get the raw scsi device name from multipath -l.
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DEV=`multipath -l $DM_NAME |awk '/running/{print $3 ; exit}'`
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if [ -z "$DEV" ] ; then
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exit 0
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fi
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fi
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if echo $DEV | grep -q ^/devices/ ; then
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sys_path=$DEV
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else
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sys_path=`udevadm info -q path -p /sys/block/$DEV 2>/dev/null`
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fi
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dirs=(`echo "$sys_path" | tr / ' '`)
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scsi_host_dir="/sys"
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# Get path up to /sys/.../hostX
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for (( i=0; i<${#dirs[*]}; i++ )); do
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d=${dirs[$i]}
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scsi_host_dir="$scsi_host_dir/$d"
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echo $d | egrep -q -e '^host[0-9]+$' && break
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done
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if [ $i = ${#dirs[*]} ] ; then
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exit 0
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fi
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PCI_ID=`echo ${dirs[$(( $i - 1 ))]} | awk -F: '{print $2":"$3}'`
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# In sas_switch mode, the directory three levels beneath /sys/.../hostX
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# contains symlinks to phy devices that reveal the switch port number. In
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# sas_direct mode, the phy links one directory down reveal the HBA port.
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port_dir=$scsi_host_dir
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case $TOPOLOGY in
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"sas_switch") j=$(($i+4)) ;;
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"sas_direct") j=$(($i + 1)) ;;
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esac
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for (( i++; i<=$j; i++ )); do
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port_dir="$port_dir/${dirs[$i]}"
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done
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PHY=`ls -d $port_dir/phy* 2>/dev/null | head -1 | awk -F: '{print $NF}'`
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if [ -z "$PHY" ] ; then
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exit 0
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fi
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PORT=$(( $PHY / $PHYS_PER_PORT ))
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# Look in /sys/.../sas_device/end_device-X for the bay_identifier
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# attribute.
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end_device_dir=$port_dir
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for (( ; i<${#dirs[*]} ; i++ )); do
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d=${dirs[$i]}
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end_device_dir="$end_device_dir/$d"
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if echo $d | egrep -q -e '^end_device' ; then
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end_device_dir="$end_device_dir/sas_device/$d"
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break
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fi
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done
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SLOT=`cat $end_device_dir/bay_identifier 2>/dev/null`
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if [ -z "$SLOT" ] ; then
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exit 0
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fi
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SLOT=`map_slot $SLOT`
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CHAN=`map_channel $PCI_ID $PORT`
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if [ -z "$CHAN" ] ; then
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exit 0
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fi
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ID_VDEV=${CHAN}${SLOT}${PART}
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echo "ID_VDEV=${ID_VDEV}"
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echo "ID_VDEV_PATH=disk/by-vdev/${ID_VDEV}"
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