Re: [Bacula-users] [Bacula-devel] bacula (un)mount request

Alan Brown wrote:

> Now that I've got a better understanding of the problem, I see two 
> options for fabric connected tape drives (usually inside a library)
> 
> 1: Send unlock commands to all instances of the tape drive - this 
> requires that all instances are known to bacula or the scripts it calls.
> 

Here's my "scripted in an hour" solution.

It's non-portable (RHEL 5.6) AND assumes:

  1: tape drive entries in bacula-sd.conf are symlinks to 
/dev/tape/by-id/ entries.

  2: There are only 2 connections from the SD host to the fabric.

  3: /etc/udev/50-udev-rules has been modified as below (submitted to 
redhat. It fixes some typos in RH's supplied file and adds -sg devices)

I'm sure others on these lists can do much better (hint!)...

===================
Firstly: mtx-changer

# diff -C10 -F3 -r mtx-changer mtx-changer-MSSL
*** mtx-changer.ORIG    2010-09-15 13:27:23.000000000 +0100
--- mtx-changer-MSSL    2011-02-10 17:32:16.000000000 +0000
***************   while [ $i -le 300 ]; do  # Wait max 3
*** 147,166 ****
--- 147,170 ----
   slot=$3
   device=$4
   drive=$5

   debug "Parms: $ctl $cmd $slot $device $drive"

   case $cmd in
      unload)
         debug "Doing mtx -f $ctl unload $slot $drive"

+ # AJB2 20110210 - unlock BOTH /dev/nst instances
+       /usr/local/bin/unlocktapedrive.sh $device
+ # End of addition.
+
         if test ${offline} -eq 1 ; then
         mt -f $device offline
         fi
         if test ${offline_sleep} -ne 0 ; then
         sleep ${offline_sleep}
         fi
         ${MTX} -f $ctl unload $slot $drive
         ;;

      load)

==========================

Secondly: /usr/local/bin/unlocktapedrive.sh

#!/bin/bash

# on a Fibrechannel host with 2 connections to the fabric,
# a tape drive will show up twice.
#
# It's possible for udev to swap /dev/tape/by-id around,
# which is fine for standard operations, BUT:
#
# Therefore a drive might be locked by one initiator
# and unlocked from the other.
#
# That doesn't work.
#
# Tape drive door locks are set per-initiator and ORed.
#
# locks set by one initiator have to be released by the same
# initiator AND multiple locks can be set (one per initiator)
#
# This script gets BOTH /dev/nst devices for each
# /etc/bacula/DEVICES/{drive} (symlinks to /dev/tape/by-id/)
# and sends unlocks to them, to be on the safe side.
#
# input is assumed to be /etc/bacula/DEVICES/{drive}

if ! test -h $1
         then
         echo Argument: /dev/bacula/DEVICES/{drive}
         exit 1
fi

# GET THE /dev/tape/by-id for this device
export INDIRECT=`/bin/ls -l $1 | /bin/cut -f2 -d\>`

# udev sometimes loses drives, or other weirdness might hav happened.
if ! test -h $INDIRECT
         then
         echo I've lost that drive!
         exit 1
fi

# get the /dev/nst being used.
export DEVICE=`/bin/ls -l $INDIRECT | /bin/cut -f2 -d\>  | /bin/cut -f3 -d/`

# get the device's /dev/tape/by-path entry
export PATH=`/bin/ls -l /dev/tape/by-path | /bin/grep $DEVICE$  | 
/bin/cut -f4 -d-`

# get the OTHER device
export DEVICEGHOST=`/bin/ls -l /dev/tape/by-path/*$PATH-nst | /bin/grep 
-v $DEVICE$ | /bin/cut -f2 -d\> | /bin/cut -f3 -d/`

#echo $1 $INDIRECT $DEVICE $PATH $DEVICEGHOST

#echo $DEVICE $DEVICEGHOST

/bin/mt -f /dev/$DEVICE unlock
/bin/mt -f /dev/$DEVICEGHOST unlock

exit 0
# Spaghetti scripts rule OK
===========================

Thirdly: My modifications to /etc/udev/rules.d/50.udev-rules

# diff -F5 -u /etc/udev/OLDRULES/50-udev.rules.EL-5.6-ORIG-20110126 
/etc/udev/rules.d/50-udev.rules
--- /etc/udev/OLDRULES/50-udev.rules.EL-5.6-ORIG-20110126 
2011-01-26 15:57:48.000000000 +0000
+++ /etc/udev/rules.d/50-udev.rules     2011-02-10 17:06:33.000000000 +0000
@@ -255,26 +255,30 @@ KERNEL=="usb/rio500",             MODE="0660"

  KERNEL=="dm-[0-9]*", GOTO="persistent_end"

+SUBSYSTEM!="scsi_tape", GOTO="persistent_storage_tape_end"
+
  KERNEL=="st*[0-9]|nst[0-9]*", IMPORT{parent}=="ID_*"
-KERNEL=="st*[0-9]|nst[0-9]*", SUBSYSTEM=="scsi_tape", ENV{ID_SERIAL}=="", \
-       IMPORT{program}="scsi_id -u -g -x -s %p -d $tempnode"
-KERNEL=="st*[0-9]|nst[0-9]*", SUBSYSTEM=="scsi_tape", ENV{ID_SERIAL}=="", \
-       IMPORT{program}="scsi_id -u -g -x -a -s %p -d $tempnode"
-KERNEL=="nst[0-9]*", SUBSYSTEM=="scsi_tape", ENV{ID_SERIAL}=="?*", \
-       SYMLINK+="tape/by-id/$env{ID_BUS}-$env{ID_SERIAL}"
+KERNEL=="st*[0-9]|nst[0-9]*", SUBSYSTEM=="scsi_tape", 
ENV{ID_SERIAL}=="", IMPORT{program}="scsi_id -u -g -x -s %p -d $tempnode"
+KERNEL=="st*[0-9]|nst[0-9]*", SUBSYSTEM=="scsi_tape", 
ENV{ID_SERIAL}=="", IMPORT{program}="scsi_id -u -g -x -a -s %p -d $tempnode"
+KERNEL=="nst*[0-9]", SUBSYSTEM=="scsi_tape", ENV{ID_SERIAL}=="?*", 
SYMLINK+="tape/by-id/$env{ID_BUS}-$env{ID_SERIAL}-nst"
+KERNEL=="st*[0-9]", SUBSYSTEM=="scsi_tape", ENV{ID_SERIAL}=="?*", 
SYMLINK+="tape/by-id/$env{ID_BUS}-$env{ID_SERIAL}-st"

-SUBSYSTEM!="scsi_tape", GOTO="persistent_storage_tape_end"
  # by-path (parent device path)
  KERNEL=="st*[0-9]|nst*[0-9]", IMPORT{program}="path_id %p"
  KERNEL=="st*[0-9]", ENV{ID_PATH}=="?*", 
SYMLINK+="tape/by-path/$env{ID_PATH}"
-KERNEL=="nst*[0-9]", ENV{ID_PATH}=="?*", 
SYMLINK+="tape/by-path/$env{ID_PATH}-nst"
+KERNEL=="nst*[0-9]", ENV{ID_PATH}=="?*", 
SYMLINK+="tape/by-path/$env{ID_PATH}"
  LABEL="persistent_storage_tape_end"

  # type 8 devices are "Medium Changers"
  KERNEL=="sg*", IMPORT{parent}=="ID_*"
  KERNEL=="sg*", SUBSYSTEM=="scsi_generic", SYSFS{type}=="8", 
ENV{ID_SERIAL}=="", IMPORT{program}="scsi_id -g -u -x -s %p -d $tempnode"
  KERNEL=="sg*", SUBSYSTEM=="scsi_generic", SYSFS{type}=="8", 
ENV{ID_SERIAL}=="", IMPORT{program}="scsi_id -g -u -x -a -s %p -d $tempnode"
-KERNEL=="sg*", SUBSYSTEM=="scsi_generic", SYSFS{type}=="8", 
ENV{ID_SERIAL}=="?*", SYMLINK+="tape/by-id/$env{ID_BUS}-$env{ID_SERIAL}"
+KERNEL=="sg*", SUBSYSTEM=="scsi_generic", SYSFS{type}=="8", 
ENV{ID_SERIAL}=="?*", 
SYMLINK+="tape/by-id/$env{ID_BUS}-$env{ID_SERIAL}-changer"
+
+# type 1 devices are "Scsi Tape"
+KERNEL=="sg*", SUBSYSTEM=="scsi_generic", SYSFS{type}=="1", 
ENV{ID_SERIAL}=="", IMPORT{program}="scsi_id -g -u -x -s %p -d $tempnode"
+KERNEL=="sg*", SUBSYSTEM=="scsi_generic", SYSFS{type}=="1", 
ENV{ID_SERIAL}=="", IMPORT{program}="scsi_id -g -u -x -a -s %p -d $tempnode"
+KERNEL=="sg*", SUBSYSTEM=="scsi_generic", SYSFS{type}=="1", 
ENV{ID_SERIAL}=="?*", SYMLINK+="tape/by-id/$env{ID_BUS}-$env{ID_SERIAL}-sg"

  SUBSYSTEM!="block", GOTO="persistent_end"
=======================




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