Hello
all,
I'm
building a new NBU 6.5 environment on RedHat...
[root@<>dev]# uname -a Linux <>2 2.6.9-55.ELsmp #1 SMP Fri
Apr 20 16:36:54 EDT 2007 x86_64 x86_64 x86_64 GNU/Linux
and am
trying to wrap my head around the FC-SCSI tape device configuration.
I have seen/heard mention that udev rules should be create to ensure that
persistent naming occurs in the event that the server gets rebooted, SAN changes
are made, new devices are added, etc
The
way I understand things, the following is the method to get things working on
the server side:
1)
Kernel detects tape scsi devices and creates /dev/nst## device files (and
/dev/st## device files)
ie: /dev/nst1
2)
Links are created via the default udevrules , create "tape" device
symlinks.
ie: tape81 -> nst23a
3)
Run "/dev/MAKEDEV sg" to create the sg links that Netbackup needs to
populate the device database
Question here: does the MAKEDEV command look for
/dev/nst devices? Or is it based on the "tape#" symlinks described
above?
If the
answer is that is uses the symlinks, then I think I understand how the udev
rules would be used (scsi_id -g -u -s <nst device> used to get
the scsi inquiry string, create a rules so that the result of that inquiry
always creates the same tape#). If not, could someone enlighten
me?
Cheers,
Jon
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