STMS (MPxIO) degraded path messages seen at Solaris[TM] 8, 9, 10, or 11 boot time.

Asset ID:	1-71-1003456.1
Update Date:	2017-11-30
Keywords:

Solution Type Technical Instruction Sure

Solution 1003456.1 : STMS (MPxIO) degraded path messages seen at Solaris[TM] 8, 9, 10, or 11 boot time.

Related Items


Sun Fire T1000 Server
 Sun Fire 15K Server
 Sun Fire V100 Server
 Sun Fire V40z Server
 Sun SPARC Enterprise T1000 Server
 Sun SPARC Enterprise M8000 Server
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Related Categories


PLA-Support>Sun Systems>SPARC>Enterprise>SN-SPARC: Mx000
 _Old GCS Categories>Sun Microsystems>Servers>OPL Servers

PreviouslyPublishedAs
204843

Applies to:

Sun Fire T2000 Server - Version All Versions and later
Sun SPARC Enterprise T1000 Server - Version All Versions and later
Sun Fire 3800 Server - Version All Versions and later
Sun Fire T1000 Server - Version All Versions and later
Sun Netra T2000 Server - Version All Versions and later
All Platforms

Goal

To help diagnose boot messages that seem to imply a failed path in STMS/MPxIO.

Solution

As Solaris[TM] boots you can see the following "degraded" message from the Sun[TM] multipath software, STMS, until both paths are enabled to the storage.
The message "multipath status: degraded" can be a cause for concern even though further into the boot process it shows the path becoming optimal. It can be mistakenly inferred to be a fibre channel/path problem.

For example, below is a portion of messages seen at boot time from a host with a StorEdge[TM] 99x0 array attached:

ssd269 at scsi_vhci0: name g50060e80000000000000eade000000ff, bus address
g50060e80000000000000eade000000ff
ssd269 is /scsi_vhci/ssd@g50060e80000000000000eade000000ff
<HITACHI-OPEN-E-CVS-CM-2103 cyl 48 alt 2 hd 15 sec 96>
/scsi_vhci/ssd@g50060e80000000000000eade000000ff (ssd269) multipath status:
degraded, path /pci@1d,600000/SUNW,qlc@1/fp@0,0 (fp0) to target address:
50060e8003eade00,ff is online

Further down the messages we see the other path come online, path changes to optimal (Note the /pci@ address and wwn differ now, same ssd instance)

/scsi_vhci/ssd@g50060e80000000000000eade000000ff (ssd269) multipath status:
optimal, path /pci@3d,600000/SUNW,qlc@1/fp@0,0 (fp2) to target address:
50060e8003eade10,ff is online

We see the below with T3/39x0 arrays, again, once the second path comes online we do not see the "degraded" status any more. Here we are seeing each side of a T3 partner group, note the paths, /sbus@

/scsi_vhci/ssd@g60020f200000a3343eede2a7000c33c4 (ssd74) multipath status:
degraded, path /sbus@2,0/SUNW,qlc@1,30000/fp@0,0 (fp0) to target address:
50020f230000a334,1 is online

And further down the second path comes up, note that with T3's there is the concept of a "primary" path and a "standby" path.

/scsi_vhci/ssd@g60020f200000a3343eede2a7000c33c4 (ssd74) multipath status:
optimal, path /sbus@6,0/SUNW,qlc@2,30000/fp@0,0 (fp2) to target address:
50020f230000cefd,1 is standby

However, the mention of the path being degraded can also be of genuine concern, this needs to be looked at to determine if we have an underlying fault. (which is outside the scope of this document)

WARNING: fp(0): N_x Port with D_ID=10d00, PWWN=50060e8003eade00 disappeared from fabric /pci@1d,600000/SUNW,qlc@1/fp@0,0 (fcp0): offlining lun=ff (trace=0), target=10d00 (trace=2800004)

/scsi_vhci/ssd@g50060e80000000000000eade000000ff (ssd269) multipath status:
degraded, path /pci@1d,600000/SUNW,qlc@1/fp@0,0 (fp0) to target address:
50060e8003eade00,ff is offline

Internal Comments
Previously Published As 72610

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