Make address assignment reliable across drive swaps and reboots when paired with HP SAS Expanders

68-fix-intel-scu.rules

### Reset the device's path variables and symlinks
KERNEL=="sd*", ENV{DEVTYPE}=="disk" SUBSYSTEM=="block", DRIVERS=="isci", PROGRAM="/usr/local/bin/udev-fix-intel-scu.sh $kernel $env{DEVPATH} $env{ID_PATH} $env{ID_WWN} $env{ID_SERIAL}", ENV{ID_PATH_TAG}="%c{1}", ENV{ID_PATH}="%c{4}", SYMLINK="disk/by-id/%c{2} disk/by-id/%c{3} disk/by-path/%c{4}"
KERNEL=="sd*", ENV{DEVTYPE}=="partition" SUBSYSTEM=="block", DRIVERS=="isci", PROGRAM="/usr/local/bin/udev-fix-intel-scu.sh $kernel $env{DEVPATH} $env{ID_PATH} $env{ID_WWN} $env{ID_SERIAL}", ENV{ID_PATH_TAG}="%c{1}", ENV{ID_PATH}="%c{4}", SYMLINK="disk/by-id/%c{2}-part%n disk/by-id/%c{3}-part%n disk/by-path/%c{4}-part%n"

### No modifications to symlinks or properties, used for testing
#KERNEL=="sd*", SUBSYSTEM=="block", DRIVERS=="isci", PROGRAM="/usr/local/bin/udev-fix-intel-scu.sh $kernel $env{DEVPATH} $env{ID_PATH} $env{ID_WWN} $env{ID_SERIAL}"

udev-fix-intel-scu.sh

#!/bin/bash
# Modified from https://gist.github.com/Toasty27/49da6175371cdde317e662fb8a7d078a

# udev rules:/usr/lib/udev/rules.d/68-fix-intel-scu.rules
# Needs to execute before 69-vdev.rules for vdev_id.conf to reference remapped paths.

# Script:/usr/local/bin/udev-fix-intel-scu.sh
# Changes make address assignment reliable across drive swaps and reboots when paired with HP SAS Expanders.
# Resultantant paths should look like:
# /dev/disk/by-path/pci-0000:03:00.0-sas-0x5001438020b95e-phy00
# /dev/disk/by-path/pci-0000:03:00.0-sas-0x5001438020b95e-phy00-part1
# /dev/disk/by-path/pci-0000:03:00.0-sas-0x5001438020b95e-phy00-part9
# /dev/disk/by-path/pci-0000:03:00.0-sas-0x5001438020e51f-phy00
# /dev/disk/by-path/pci-0000:03:00.0-sas-0x5001438020e51f-phy00-part1
# /dev/disk/by-path/pci-0000:03:00.0-sas-0x5001438020e51f-phy00-part9
# I trimmed the last two characters of the SAS expander address, 
# as those seem to change with each disk, and replaced it with the port number on the expander.


###
# Get properties for the device
###
Dev=$1
DevPath=$2
IDPath=$3
IDWWN=$4
IDSerial=$5

LOG_FILE=/var/log/udev-intel-scu-fix/dev-${1}.log

### Log initial values for properties
echo $(date) >> $LOG_FILE

echo "Vars:" >> $LOG_FILE
echo "$Dev" >> $LOG_FILE
echo "$DevPath" >> $LOG_FILE
echo "$IDPath" >> $LOG_FILE
echo "$IDWWN" >> $LOG_FILE
echo "$IDSerial" >> $LOG_FILE
echo ""  >> $LOG_FILE

###
#  Get the PCI host address and the SCSI device address
#  This is done most reliably by enumerating the DEVPATH tree and greping
#+ for child values
###
DevHost=$(IFS='/' read -a array <<< $(echo $DevPath); printf '%s\n' "${array[@]}" | grep -B 1 host | grep -v host)
DevScsiID="$(IFS='/' read -a array <<< $(echo $DevPath); printf '%s\n' "${array[@]}" | grep -B 1 target | grep -v target | awk -F':' '{print $3}')"
printf -v DevScsiID "%02d" $DevScsiID
DevScsiID="phy$DevScsiID"

echo "Host: $DevHost Disk: $DevScsiID" >> $LOG_FILE

###
#  Create the new ID_PATH and ID_PATH_TAG strings
#  We're basically trying to copy the output of the `handle_scsi_default`
#+ function in the path_id builtin
###

newIDPath=`echo "${IDPath}-${DevScsiID}" | sed 's/..\-lun\-0//' | sed 's/'"${DevScsiID}-${DevScsiID}"'/'"${DevScsiID}"'/'`
newIDPathTag=$(echo $newIDPath | sed 's/:/_/g')

echo "Old ID_PATH: $IDPath" >> $LOG_FILE
echo "New ID_PATH: $newIDPath" >> $LOG_FILE

echo "" >> $LOG_FILE
echo "------------------------" >> $LOG_FILE
echo "" >> $LOG_FILE

### Output our modified properties for use by udev
echo "$newIDPathTag ata-$IDSerial wwn-$IDWWN $newIDPath"