Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: [ASK] - AIX Fibre Channel behavior
Operating Systems AIX [ASK] - AIX Fibre Channel behavior Post 303031937 by bakunin on Friday 8th of March 2019 01:33:33 AM
Old 03-08-2019
Quote:
Originally Posted by Phat
Let me introduce about the context and my environment.
We have an AIX 6.1 system, it has 4 FC channels
Code:
[root@xxx] / > lsdev -Cc adapter | grep fcs
fcs0 Available 23-T1 Virtual Fibre Channel Client Adapter
fcs1 Available 23-T1 Virtual Fibre Channel Client Adapter
fcs2 Available 23-T1 Virtual Fibre Channel Client Adapter
fcs3 Available 23-T1 Virtual Fibre Channel Client Adapter

- 2 virtual FC fcs0, fcs2 comes from VIOS_A --> mapped to the only 1 physical FC
- 2 virtual FC fcs1, fcs3 comes from VIOS_B --> mapped to the only 1 physical FC

--> We can say we have 2 physical FC path.
At first a few general remarks: If you want to analyse aspects of a system configuration in a (virtualised) AIX environment what you posted is not helpful at all. You need to look elsewhere, especially:

1) The LPARs profile on the HMC, either via the Web GUI or the commandline (lssyscfg and lshwres)

2) VIOS profile on the HMC

3) from the VIOS commandline the various aspects of virtualised resources (lsdev, lsvdev, lsmap, ...)

What you posted simply won't tell you (or us) anything useful (that is: useful on its own) information about the system. Its like if i would ask you how to repair my car and when you ask back "which car?" i'd say "a yellow one".

Quote:
Originally Posted by Phat
There is a chance that I reboot the machine, and it cannot boot up. It said that the boot partition is not found. In the SMS mode, I have checked and found that the fcs2 is failed, and fcs3 is partially worked

Code:
WorldWidePortName: c050760941350104
 1.  202700a0b86e87a4,0                 0 MB Disk drive - reserved
 2.  202700a0b86e87a4,1000000000000     107 GB Disk drive
 3.  202700a0b86e87a4,2000000000000     0 MB Disk drive - reserved
 4.  202700a0b86e87a4,3000000000000     0 MB Disk drive - reserved
 5.  202700a0b86e87a4,4000000000000     0 MB Disk drive - reserved
 6.  202700a0b86e87a4,5000000000000     0 MB Disk drive - reserved
 7.  202700a0b86e87a4,6000000000000     0 MB Disk drive - reserved
 8.  202700a0b86e87a4,7000000000000     0 MB Disk drive - reserved
 9.  202700a0b86e87a4,8000000000000     107 GB Disk drive
10.  202700a0b86e87a4,9000000000000     107 GB Disk drive
11.  202700a0b86e87a4,a000000000000     107 GB Disk drive
12.  202700a0b86e87a4,b000000000000     0 MB Disk drive - reserved

First action, I have asked the storage guy to remove the fcs3 WWPN from the mapping, try to detect the boot device, then asked again to remove fcs2 WWPN, the both case didn't help.

Second action, I asked the storage guy to map back the fcs2 & fcs3 WWPN back to the machine. Try to detect and get the positive results. Now fcs3 can see all the LUN and detect the boot device.
Code:
Select Attached Device
  Pathname: /vdevice/vfc-client@300001a7
  WorldWidePortName: c050760941350104
 1.  202700a0b86e87a4,0                 107 GB Disk drive - bootable
 2.  202700a0b86e87a4,1000000000000     107 GB Disk drive
 3.  202700a0b86e87a4,2000000000000     107 GB Disk drive
 4.  202700a0b86e87a4,3000000000000     107 GB Disk drive
 5.  202700a0b86e87a4,4000000000000     107 GB Disk drive
 6.  202700a0b86e87a4,5000000000000     107 GB Disk drive
 7.  202700a0b86e87a4,6000000000000     107 GB Disk drive
 8.  202700a0b86e87a4,7000000000000     107 GB Disk drive
 9.  202700a0b86e87a4,8000000000000     107 GB Disk drive
10.  202700a0b86e87a4,9000000000000     107 GB Disk drive
11.  202700a0b86e87a4,a000000000000     107 GB Disk drive
12.  202700a0b86e87a4,b000000000000     107 GB Disk drive

At the end I can boot up the AIX machine back to normal.
First: what do you mean by "mapping"?? Do you mean "zoning"?

Second: which storage do you use?

Third: how is your system connected to the storage? I mean: physically connected. How does the FC cabling layout look like? I.e. are both ports on the physical adapters connected? And, if yes, do they work both?

Quote:
Originally Posted by Phat
Code:
- 2 virtual FC fcs0, fcs2 comes from VIOS_A  --> mapped to the only 1 physical FC
- 2 virtual FC fcs1, fcs3  comes from VIOS_B  --> mapped to the only 1 physical FC

With the first action, the fcs2 & fcs3 were removed. We still have fcs0 & fcs1 (mapped to 2 different physical FCs) can see the LUN, but not see the bootable partition.

With the second action, fcs2 & fcs3 were re-added, this action makes fcs3 refreshed and see the LUN with bootable partition.

Why in the first action, the LUN & boot partition is not detected? we still have the full visibility to the LUN.
Why in the second action, we can see the LUN and boot partition?

As I know, FC card has 2 ports. if 1 port failed, the rest can continue to work. Please correct me if I'm wrong.
You are wrong: not wrong in that the card may have two ports but wrong in the assumption that if it has two ports both have to work. Maybe only one is connected, i don't know - but you don't know either, so i suggest you find out. See above - you (seem to) don't know some pretty relevant details about your environment.

Quote:
Here in reality, we have 2 physical FCs with 1 port failure per each, and still not boot the server until 1 port failure come up again.
This can have all sorts of reasons and then some: the zoning was wrong before and correct then, the zones where there but not correctly activated, there was a short outage of the FC connection - this happens frequently, which is why ones uses multipath drivers. (This is also the reason why i feel more comfortable not booting off a NPIV device.) And, and, ....

Sorry to have no better answer for you but you will have to learn how FC works, how zoning works, etc. - not to forget how IBM virtualisation works - to understand your environment. I am glad to explain some detail to you but i cannot teach you the job over the internet. And i am glad to help you but i cannot troubleshoot your system over the internet either.

I hope this helps.

bakunin
 

9 More Discussions You Might Find Interesting

1. AIX

Fibre channel drivers on RS/6000 aix 5L

Want to configure IBM raid strorage but the aix 5L cds do not have the drivers for the fibre channels. The machine is RS/6000. I have gone to IBM downlaodable sites but i can't find the drivers? help pliz:mad: (4 Replies)
Discussion started by: Zim-Aix-Guru
4 Replies

2. AIX

Install Fibre Card AIX 5.3

Hello, I have two systems that are being prepared to be SAN attached .. can anyone tell me any specific checks I should perform prior to the cards being installed... I am aware of firmware / OS level and relevant drivers, is there anything else? thanks Chris. (8 Replies)
Discussion started by: chlawren
8 Replies

3. AIX

Power6 Virtual Fibre Channel Adapter

Hello, Searched in all IBM Redbooks and on the internet and couldn't find anything about the new feature of POWER 6 which Virtual Fibre ( Fiber ) channel adapter. It is similar to virtual scsi adapter. In my client partition I created the virtual Fibre Adapter mapped it with the VIO... (1 Reply)
Discussion started by: filosophizer
1 Replies

4. Solaris

USCSICMD ioctl calls for Fibre Channel(FC) devices on Solaris 10?

Hi , I have wrtitten a C program that issues USCSICMD ioctl call to the tape devices attached on solaris sparc 10. I was able to get the required information from all SCSI tape devices attached using the utility. But, whenever it is run on FC attached tape drives , the program returns an error... (0 Replies)
Discussion started by: naveen448
0 Replies

5. AIX

Setting up a secure channel with AIX

hi i have two aix servers and I was asked to setup a secure shell between the two servers using the sybase user. Can any one let me know how to do this (2 Replies)
Discussion started by: newtoaixos
2 Replies

6. Hardware

Fibre Channel HBA recommendations?

We will be buying new Xeon E5-based servers for our datacenter and were wondering which Fibre Channel host bus adapters we should select for these. The choices are Emulex or QLogic (8Gb FC HBAs). Anybody have any recommendations on which is the better choice? Thanks in advance. (1 Reply)
Discussion started by: atahmass
1 Replies

7. AIX

AIX - Fibre Adapter and IBM Storage

Hello, Just a quick question Usually from a PSERIES if you want to connect to IBM SAN Storage you connect the IBM SAN Storage through a SAN Switch something like this --- however my question Can you connect from Pseries directly to San Storage without SAN Switch what would be... (8 Replies)
Discussion started by: filosophizer
8 Replies

8. Solaris

Fibre channel link down on booting Solaris server

Hi I had power issue that affected a server, in which I had power ON the server SPARC T1-B3 running solaris 10. After power on the system stops at ok prompt, them I issued the following commands: {0} ok setenv auto-boot? false auto-boot? = false {0} ok reset-all SPARC T3-1B,... (10 Replies)
Discussion started by: fretagi
10 Replies

9. Solaris

Fibre Channel link not ready on Netra 240

Hi, One of my Netra 240 went into hung state and I had to reboot it. I powered it off and tried booting it again but unsuccessful. It is not connected to SAN and have local disks. Not able to boot in failsafe mode too. There are two disks of 72GB, both are mirrored in SVM. It complains about... (5 Replies)
Discussion started by: solaris_1977
5 Replies
All times are GMT -4. The time now is 01:15 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy