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SAN Disk Appearing double in AIX


 
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Operating Systems AIX SAN Disk Appearing double in AIX
# 8  
Old 08-15-2013
How did you define the WWPN on storage? and how did you map the WWPNs to host.?
# 9  
Old 08-15-2013
Quote:
Originally Posted by ibmtech
How did you define the WWPN on storage? and how did you map the WWPNs to host.?
There are two ways using IBM Storage CLient Software

1) Use the default group, which has the WWPN hosts direct connection, so i didn't define...

or

2) Under the default group --> Create a new Group/Host --> it will ask you for Host mapping ...

attachment included...
SAN Disk Appearing double in AIX-errorssan2jpg
# 10  
Old 08-16-2013
Actually that you see the same disk from different angles is not a bug, it is a feature. If one of these connections (and hence the related hdisk device) would be disconnected the whole system would still work.

This is what "multipath" drivers are all about: to create single devices back from the various device entries, which represent different views of the same hardware.

Not sure what your question is, but i hope this helps.

bakunin
# 11  
Old 08-16-2013
The standard practice would be to have one disk appearing in AIX but with multiple paths.

So hdisk8 should be having two paths : ie., through Controller A an Controller B instead of appearing as Hdisk8 through Controller A and Hdisk9 through Controller B ; To achieve this do I need to place a SAN Switch between AIX machine and SAN Storage and do zoning or is the problem related to config ?

thanks
# 12  
Old 08-16-2013
I know exactly your configuration, since they are directly plugged into each controller, they are seeing it as a single path (even though if you are mapping two WWNs to a single host).

Two options,
1. 1st install MPIO on this system (if you have on VIO, it won't help as you have a direct connection to SAN from the LPAR itself). I am less confident this might help you resolve the problem.

2. Add a fabric, and do the zoning, and then map the LUN.

With the way it is seen now, there are high chances of data corruption.
This User Gave Thanks to ibmtech For This Post:
# 13  
Old 08-16-2013
Quote:
Originally Posted by ibmtech
I know exactly your configuration, since they are directly plugged into each controller, they are seeing it as a single path (even though if you are mapping two WWNs to a single host).

Two options,
1. 1st install MPIO on this system (if you have on VIO, it won't help as you have a direct connection to SAN from the LPAR itself). I am less confident this might help you resolve the problem.

2. Add a fabric, and do the zoning, and then map the LUN.

With the way it is seen now, there are high chances of data corruption.
Thanks for the reply. I already have MPIO drivers installed in the VIOS. I will try with option 2 and post results. But with option #2 , I need to configure zoning.. I am not familiar with zoning, is it easy ?
# 14  
Old 08-16-2013
Ok,

Zoning to a SAN admin is easy, but if you are new it might take a few efforts to set it. I am not sure what switch you have or (will use).

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