AIX LPAR FC connection to SAN


 
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Operating Systems AIX AIX LPAR FC connection to SAN
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Old 03-01-2019
Quote:
Originally Posted by Phat
In the HMC profile, I can see there are 3 physical FC assigned to the server as attached.

I also see 6 FC ports which is equivalent from 3x2=6
Exactly. Look at the "location codes" which i have marked bold:

Code:
[root@zzz] / > lsdev -Cc adapter | grep fcs
fcs0 Available 00-00 8Gb PCI Express Dual Port FC Adapter (df1000f114108a03)
fcs1 Available 00-01 8Gb PCI Express Dual Port FC Adapter (df1000f114108a03)
fcs2 Available 01-00 8Gb PCI Express Dual Port FC Adapter (df1000f114108a03)
fcs3 Available 01-01 8Gb PCI Express Dual Port FC Adapter (df1000f114108a03)
fcs4 Available 05-00 8Gb PCI Express Dual Port FC Adapter (df1000f114108a03)
fcs5 Available 05-01 8Gb PCI Express Dual Port FC Adapter (df1000f114108a03)

fcs0 and fcs1 are port 0 and 1 from the same adapter, etc. for the others. In the HMC display you posted you see the "real" (physical) location codes where the adapters are located in the system. I.e. one adapter is located in the CEC with serial number 9K83854 in slot P1-C5.

Quote:
Originally Posted by Phat
Can we say the "physical" FC adapter here are actually the real physical FC adapter from Power Machine which are assigned to the lpar not via VIOS (with virtual FC adapter) ?
Yes, absolutely. The reason for the VIOS is this: you have some "anonymous" resources like memory and CPUs which you can easily transfer between LPARs. You cannot do this with adapters, obviously, because they are connected to something and they are configured on the "outside" too. Neither you can do that with disks because they contain data which makes them the opposite of "anonymous". Therefore there is the VIOS, which takes all the physical ressources, creates virtual constructs representing these and then gives these constructs to the LPAR. This way you can move an LPAR from on managed system to the other because VIOSes ahve special means to transfer the physical layer between one another and for the LPAR the virtual construct it uses never changes - just the way it is representing some physical ressource.

I hope this helps.

bakunin
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