Hello,
I'm trying to setup our Legato NetWorker setup (7.6.3.870 on Windows
Server 2008 SP2) to be fault tolerant when a fail-over occurs with our
library.
We have the following library and server:
- Quantum Scalar i500 with 2 x HP LTO-4 drives and an I/O Blade
- PowerEdge R610 with 2 x HBA QLE2460
- Switches Brocade 300
with the following setup:
- Zone Path A = i500Port1 + switch3port9 + switch3port8 + ServerHBA0
- Zone Path B = i500Port2 + switch4port9 + switch4port8 + ServerHBA1
as seen in this schema:
Scalar i500 +-- I/O Blade +-- Port 1 <-----------+
| | |
| +-- Port 2 <--------+ |
| | |
| +-- Port 3 <-----+ | |
| | | | |
| +-- Port 4 | | |
| | | | |
| +-- Port 5 <--+ | | |
| | | | | |
| +-- Port 6 | | | |
| | | | |
+-- Drive 2 <---------------+ | | |
| | | |
+-- Drive 1 <------------------+ | |
| |
| |
Switch 4 | |
Brocade 300 +-- Port X | |
| | |
+-- ... | |
| | |
+-- Port 9 <----------------------+ |
| |
+-- Port 8 <----------------------+ |
| | |
+-- ... | |
| | |
+-- Port 1 | |
| |
| |
Backup Server +-- HBA QLE2460 #1 <------------+ |
+ |
+-- HBA QLE2460 #0 <------------+ |
| |
| |
Switch 3 | |
Brocade 300 +-- Port 1 | |
| | |
+-- ... | |
| | |
+-- Port 8 <----------------------+ |
| |
+-- Port 9 <-------------------------+
|
+-- ...
|
+-- Port X
The I/O Blade can do a fail-over if, for example, it detects a problem
between one of its ports and the switches. If, for example, the port 2
is down, the drives and the changers are presented to the backup server
through the path using port 1.
The problem here is that the SCSIDEV that OS/Legato see are different
for every path. For example, we can see the changer as 8.0.5 if the
active port in the I/O Blade is the port 2. But I can see it as 4.0.5 if
the active port is the 1. And more strange, I've seen the changer as
4.1.5 when the active port is the 1 in the I/O Blade.
As far we know, in the x.y.z SCSIDEV number, the "z" is the LUN of the
element (and always is 0 for the I/O Blade port, 1 for the first drive,
2 for the 2nd drive and 5 for the changer).
We would like to have a fixed x.y so the library definition in Legato
doesn't need to be changed if a failure occurs (well, we haven't seen
failures in production but we would like to automate a such situation).
Possible solutions:
a) Configure the different components of this setup so Windows/Legato
always see the same SCSIDEV
b) Have an script that looks for the current SCSIDEV por the
"Autochanger" (a simple 'inquire' will do that) and execute some command
to disable the library, change the number and enable it again.
c) Other??
Do you have a similar setup? Is it possible to solve this "problem"?
Thanks for your help.
--
Manel Rodero Blánquez
o o o IT Systems Manager
o o o inLab FIB
o o o Barcelona School of Informatics
U P C Universitat Politècnica de Catalunya - Barcelona Tech
E-mail : manel AT fib.upc DOT edu
Tel. : +34 93 401 0847
Web : http://inlab.fib.upc.edu/
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