Anthony's Blog: Using System Storage - An Aussie Storage Blog
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For many years I have been working on a document that lets you translate a World Wide Port Name (WWPN) into a physical location on an IBM Storage System.
I blogged recently about how SVC and Storwize V7000 WWPNs have a slightly different layout.
The contents of that blog entry come straight from that document.
I have now pushed that document out to IBM Techdocs.
You can download it from here:
Feel free to share any feedback you have and share it with your colleagues.
anthonyv 2000004B9K Tags:  ds6000 mpio svc 2105 ds8000 ess sdd sddpcm aix pcm 5 Comments 35,527 Views
SDDPCM (Subsystem Device Driver Path Control Module) is the multi-pathing plug-in for AIX 5.3 and 6.1.
Customers who use IBM SVC, DS6000, DS8000 and/or ESS800 use this package to allow the operating system to handle multiple paths from OS to storage.
The good news is that this plug-in is supplied free of charge. The bad news is that it is not included with AIX fixpacks.
What this means is that while you may be dilligent with keeping AIX up to date, you may miss SDDPCM in the process.
There are two good reasons to keep SDDPCM in mind when planning updates:
1) Planning an upgrade from AIX 5.3 to 6.1
When AIX offered MPIO, IBM then also offered a vendor plug-in (Path Contol Module) for native AIX MPIO which IBM called SDDPCM. This means you have two choices with AIX: SDD or SDDPCM. If your considering which is best, SDDPCM is my preference. This is because it is native to the operating system and also better supports the possibility of co-existence of multiple PCMs. Note that migrating from SDD to SDDPCM is not supported by the VIOS at this time, so if your running VIOS you will need to stay put for now.