[linux-iscsi-users] Making consistent iscsi device naming

[TheR 2 <d_...@ya...>]

This is what I managed to do. It works so far even for luns that are created
dynamicly and rediscovered with "iscsiadm -m session -R" command.


1. I have created /etc/iscsi/persistent.names.conf. It looks like this:
-------------
iqn.2100-05.si.ozs:diski.sas;0;iscsi/win_portal
iqn.2100-05.si.ozs:diski.sas;1;iscsi/dns1
iqn.2100-05.si.ozs:diski.sas;2;iscsi/dns2
-------------

2. I have created /etc/udev/rules.d/60-persistent-iscsi.rules. It looks like
this:
-------------
# This file maintains persistent names for iscsi disks.

ENV{DEVTYPE}=="disk", ENV{ID_PATH}=="", DEVPATH!="*/virtual/*",
IMPORT{program}="path_id %p"
ENV{DEVTYPE}=="disk", ENV{ID_PATH}=="?*",
PROGRAM="/usr/bin/persistent_iscsi.rb $env{ID_PATH}", SYMLINK+="%c"
--------------

3. And finaly I have created this Ruby script, since I do almost all my
programing in Ruby.
--------------
#!/usr/bin/ruby

# id looks like this:
ip-192.168.1.221:3260-iscsi-iqn.2100-05.si.ozs:diski.sas-lun-0
id = ARGV.first
device = nil
# parse id on - sign
a = id.split('-')
# third part should be iscsi
exit 1 unless a[2] == 'iscsi'
# get lun and iqn
id_iqn = a[3] + '-' + a[4]
id_lun = a[6]
# read my configuration file /etc/iscsi/persistent.names.conf
File.new('/etc/iscsi/persistent.names.conf').readlines.each do |line|
# config line looks like this: iqn.2100-05.si.ozs:diski.sas;2;iscsi/dns1
  iqn, lun, dev = line.chomp.split(';')
  if iqn == id_iqn and lun == id_lun
    device = dev
    break
  end
end
# Error if not found
exit 1 if device.nil?
# out device name on stdout
puts device
----------------

Now I can see this devices:

/dev/iscsi/dns1
/dev/iscsi/dns2
/dev/iscsi/win_portal

What do you think of? Should I expect any problems. This is stricly test
environment for now but will be going production by the end of the year.

Ruby is of course optional. I have no idea how to make comparisons and
parsing in shell script and I will run Ruby on server anyway. Scripting is
so much easier.


by
TheR
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