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Full Discussion: NPIV mapping problem
Operating Systems AIX NPIV mapping problem Post 302600821 by johnf on Wednesday 22nd of February 2012 06:44:52 AM
Old 02-22-2012
NPIV mapping problem
Hello all I hope someone can help me with this. I have a single LPAR which is supplied a rootvg and datavg disk set from a dual VIO server configuration. I see dual path disks for all the datavg disks but only see one path for the rootvg disks.

The client LPAR has the following:
Code:
fcs0   Available C2-T1 Virtual Fibre Channel Client Adapter
fcs1   Available C3-T1 Virtual Fibre Channel Client Adapter
fcs2   Available C4-T1 Virtual Fibre Channel Client Adapter
fcs3   Available C5-T1 Virtual Fibre Channel Client Adapter

But when lspath is run the following is returned:
Code:
Enabled hdisk4 fscsi1
Enabled hdisk5 fscsi1
Enabled hdisk6 fscsi1
Enabled hdisk2 fscsi2
Enabled hdisk0 fscsi2
Enabled hdisk4 fscsi3
Enabled hdisk5 fscsi3
Enabled hdisk6 fscsi3

As can be seen FCS0 (fscsi0) is missing. From the VIO server which is serving this adapter you have:
Code:
$ lsdev -type adapter | grep fcs
fcs0             Available   8Gb PCI Express Dual Port FC Adapter (df1000f114108a03)
fcs3             Available   8Gb PCI Express Dual Port FC Adapter (df1000f114108a03)]

When I run the map command I get the following:
Code:
$ lsmap -all -npiv
Name          Physloc                            ClntID ClntName       ClntOS
------------- ---------------------------------- ------ -------------- -------
vfchost0      U8202.E4B.06605EP-V3-C3                 2 LPAR        AIX

Status:LOGGED_IN
FC name:fcs0                    FC loc code:U78AA.001.WZSG75A-P1-C6-T1
Ports logged in:1
Flags:a<LOGGED_IN,STRIP_MERGE>
VFC client name:fcs0            VFC client DRC:U8202.E4B.06605EP-V2-C2-T1

Name          Physloc                            ClntID ClntName       ClntOS
------------- ---------------------------------- ------ -------------- -------
vfchost1      U8202.E4B.06605EP-V3-C4                 2 LPAR        AIX

Status:LOGGED_IN
FC name:fcs3                    FC loc code:U78AA.001.WZSG75A-P1-C6-T2
Ports logged in:2
Flags:a<LOGGED_IN,STRIP_MERGE>
VFC client name:fcs1            VFC client DRC:U8202.E4B.06605EP-V2-C3-T1

This is where it gets interesting on the offending vfchost it can be seen that only 1 port is logged in, whereas on the working port 2 are logged in.

I believe this is the problem but cannot find anything on a general internet trawl to answer why! I believe it is a SAN configuration problem but need evidence with which to beat up the SAN team!

I hope you can help
 

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LEARN ABOUT OSF1

volreattach

volreattach(8)						      System Manager's Manual						    volreattach(8)

NAME

       volreattach - Reattaches disk drives that have once again become accessible

SYNOPSIS

       /usr/sbin/volreattach [-rb] [accessname...]

       /usr/sbin/volreattach -c  accessname

OPTIONS

       The  volreattach  utility  has the following options: Calls the volrecover utility to attempt to recover stale plexes of any volumes on the
       failed disk.  Performs the reattach operation in the background.  Checks whether a reattach is possible. No operation is performed, but the
       name of the disk group and disk media name at which the disk can be reattached is displayed.

DESCRIPTION

       The volreattach utility attempts to reattach disks using the same disk group and media names they had before detachment.

       This  operation	may  be  necessary  if a disk has a transient failure, or if some disk drivers are unloaded or unloadable when the Logical
       Storage Manager is started, causing disks to enter the failed state.

       If the problem is fixed, the volreattach command can be used to reattach the disks without plexes being flagged as stale, as  long  as  the
       reattach happens before any volumes on the disk are started.

       The volreattach command is called from the voldiskadm menus as part of disk recovery.

       The  volreattach  utility tries to find a disk with a disk group and disk ID matching that of the disk(s) being reattached. If the matching
       disk is found, the reattach operation may still fail if the original cause (or some other cause) for the disk failure still exists.

EXIT CODES

       A zero exit status is returned if it is possible to perform a reattach.	Otherwise, non-zero is returned.

SEE ALSO

       volintro(8), voldiskadm(8), volrecover(8)

																    volreattach(8)
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