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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