Cut -n- paste from my 9/22/14 post:
lsscsi shows what you currently have.
scsi_id -whitelisted -device=/dev/st0 <-- repeat for each tape device and
your autochanger device (use /dev/sg#) - this gets you the unique scsi id to be
used in the udev rules
In your udev rules make sure that you use the nst* reference for tape, it is
the no-rewind device. Generally the rules file goes in /etc/udev/rules.d (may
be different for your distro). Name it something meaningful to you. Use
unique names, not generic ones like "Drive1". Here are a couple of examples
for entries - substitute your scsi id output where RESULT==, I like to use * as
a catchall for the scsi id:
KERNEL=="sg*", SUBSYSTEM=="scsi_generic", PROGRAM="/sbin/scsi_id
--whitelisted --replace-whitespace /dev/$name",
RESULT=="3221f0090a5004532", ATTRS{type}=="8", SYMLINK+="mychanger" <-- your
unique changer name
KERNEL=="nst*[0-9]", SUBSYSTEM=="scsi_tape", PROGRAM="/sbin/scsi_id
--whitelisted --replace-whitespace /dev/$name",
RESULT=="*321110090a5004532*", SYMLINK+="mytape-0" <-- your unique tape drive
name for your first drive - repeat for remaining drives
There are commands to play with when manipulating the rules and testing,
however, I recommend rebooting - it's the final verification. Once you use the
command line commands (mtx and mt) and find they behave consistently, then get
Bacula involved.
Patti Clark
Linux System Administrator
R&D Systems Support Oak Ridge National Laboratory
From: Robert Oschwald <robertoschwald AT gmail DOT com<mailto:robertoschwald AT
gmail DOT com>>
Date: Wednesday, October 22, 2014 at 4:24 AM
To: "bacula-users AT lists.sourceforge DOT net<mailto:bacula-users AT
lists.sourceforge DOT net>" <bacula-users AT lists.sourceforge DOT
net<mailto:bacula-users AT lists.sourceforge DOT net>>
Subject: [Bacula-users] sg device node stickyness
Using Bacula Server 7.0.4 on CentOS6_64.
One thing which annoys me is that the sg device node for TapeAlert changes with
every reboot from /dev/sg4 to /dev/sg6 and vice versa.
Is there any setting I can set in udev to get sticky device nodes for my tape
device changer device node?
System has a LSI 3Ware 9650SE controller installed which is the one fighting
for sg device node with my HP Ultrium 4 SCA tape device.
Thanks,
Robert
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