Solved

some aix nodes didn,t boot after san switch replacement

Posted on 2011-09-22
3
380 Views
Last Modified: 2013-11-17
in a single aix frame some 7 nodes are failing  after san switch replacement, but some other nodes are coming up? What points do i need to check  to make remaining nodes up
0
Comment
Question by:rammaghenthar
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
3 Comments
 
LVL 68

Expert Comment

by:woolmilkporc
ID: 36585449
Hi,

this looks quite like a zoning problem.

Are you running NPIV adapters? If so, please be aware that you must use WWN zoning on your new switch.

Port zoning will not work, because an NPIV adapter carries several WWNs, so just zoning the port is not enough.

Also please note that the switch port(s) must be made "NPIV" aware during switch setup.

The running nodes might use dedicated adapters or might be connected over a working VIOS.

wmp

0
 
LVL 2

Author Comment

by:rammaghenthar
ID: 36592184
thanks wmp ji.   what  is port level zoning ? And wwn level zoning?  as i system admin what task do i need to do? What task san team to do?
0
 
LVL 68

Accepted Solution

by:
woolmilkporc earned 500 total points
ID: 36597934
Hi,

a SAN zone is a collection of WWNs which can communicate with each other.

There are several ways of setting up such a zone.

WWN zoning means making up such a collection of WWNs to be members of a zone.
The advantage of WWN zoning is that you can plug a given HBA into any switch port, even across trunked switches and the zone will follow the WWN.

A WW(P)N is kind of a MAC address of fibre channel HBAs.

Port zoning means making up a collection of switch ports so that the WWN of any adapter connected to one of these ports will be automatically a member of the zone.
The advantage of port zoning is that you can replace HBAs without worrying, because zoning will not be affected if you connect the new HBA to the same port as the old one.

Now it should be obvious that port zoning will probably produce undesirable results, because a single NPIV HBA can carry several WWNs.
In case of port zoning all these WWNs will be automatically part of the port's zone, which will on one side lead to  blocking some needed communication paths, on the other side to opening paths which are unnecessary or even dangerous.
Live Partition Mobility in conjunction with port zoning will make things even more complicated, because the port on the target system might not be in the correct zone. In case of WWN zoning (and trunked switches, of course) Live Partition Mobility is not a problem, because the WWN will follow the LPAR.

So I really guess that your SAN zoning in the new switch is wrong, the more if NPIV and port zoning are in use.

So tell you SAN team to check the switch zoning carefully. Give them all configured NPIV WWNs (check on VIO with "lsmap -all -npiv") and advise them to use WWN zoning.

wmp
0

Featured Post

Free Tool: Subnet Calculator

The subnet calculator helps you design networks by taking an IP address and network mask and returning information such as network, broadcast address, and host range.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

A metadevice consists of one or more devices (slices). It can be expanded by adding slices. Then, it can be grown to fill a larger space while the file system is in use. However, not all UNIX file systems (UFS) can be expanded this way. The conca…
Introduction Regular patching is part of a system administrator's tasks. However, many patches require that the system be in single-user mode before they can be installed. A cluster patch in particular can take quite a while to apply if the machine…
Learn how to navigate the file tree with the shell. Use pwd to print the current working directory: Use ls to list a directory's contents: Use cd to change to a new directory: Use wildcards instead of typing out long directory names: Use ../ to move…
In a previous video, we went over how to export a DynamoDB table into Amazon S3.  In this video, we show how to load the export from S3 into a DynamoDB table.

737 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question