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Full Discussion: Mpathadm showing no paths to 1 lun, others luns are fine
Operating Systems Solaris Mpathadm showing no paths to 1 lun, others luns are fine Post 302869779 by badoshi on Thursday 31st of October 2013 08:03:59 AM
Old 10-31-2013
Mpathadm showing no paths to 1 lun, others luns are fine
Hi,

I've noticed that mpathadm states that one of our luns has no active paths:

Code:
       /dev/rdsk/c6t60000970000298700009533031324333d0s2
                Total Path Count: 4
                Operational Path Count: 4
        /dev/rdsk/c6t60000970000298700009533031333037d0s2
                Total Path Count: 4
                Operational Path Count: 0
        /dev/rdsk/c6t60000970000298700009533031324634d0s2
                Total Path Count: 4
                Operational Path Count: 4

The same lun shows up in iostat:

Code:
c6t60000970000298700009533031333037d0 Soft Errors: 0 Hard Errors: 0 Transport Errors: 0
Vendor: EMC      Product: SYMMETRIX        Revision: 5874 Serial No:
Size: 103.08GB <103080591360 bytes>
Media Error: 0 Device Not Ready: 0 No Device: 0 Recoverable: 0
Illegal Request: 2 Predictive Failure Analysis: 0

And is mirror in a zpool:

Code:
  pool: export
 state: ONLINE
 scrub: resilver completed after 0h2m with 0 errors on Wed Oct 30 14:42:42 2013
config:

        NAME                                       STATE     READ WRITE CKSUM
        export                                     ONLINE       0     0     0
          mirror-0                                 ONLINE       0     0     0
            c6t6001438002A57F6C0000800009B60000d0  ONLINE       0     0     0
            c6t60000970000298700009533031333037d0  ONLINE       0     0     0  36.4G resilvered

If the lun had no active paths, surely zfs would have complained? I only just added this lun to the zpool recently too. Is this a reporting anomoly - or deeper issue here?

Code:
root@server02 # mpathadm show lu /dev/rdsk/c6t60000970000298700009533031333037d0s2
Logical Unit:  /dev/rdsk/c6t60000970000298700009533031333037d0s2
        mpath-support:  libmpscsi_vhci.so
        Vendor:  EMC
        Product:  SYMMETRIX
        Revision:  5874
        Name Type:  unknown type
        Name:  60000970000298700009533031333037
        Asymmetric:  no
        Current Load Balance:  round-robin
        Logical Unit Group ID:  NA
        Auto Failback:  on
        Auto Probing:  NA

        Paths:
                Initiator Port Name:  10000000c978d125
                Target Port Name:  50000975f0002581
                Override Path:  NA
                Path State:  unavailable
                Disabled:  no

                Initiator Port Name:  10000000c978d0c3
                Target Port Name:  50000975f0002589
                Override Path:  NA
                Path State:  unavailable
                Disabled:  no

                Initiator Port Name:  10000000c978d0c3
                Target Port Name:  50000975f0002585
                Override Path:  NA
                Path State:  unavailable
                Disabled:  no

                Initiator Port Name:  10000000c978d125
                Target Port Name:  50000975f000258d
                Override Path:  NA
                Path State:  unavailable
                Disabled:  no

        Target Ports:
                Name:  50000975f0002585
                Relative ID:  0

                Name:  50000975f0002589
                Relative ID:  0

                Name:  50000975f0002581
                Relative ID:  0

                Name:  50000975f000258d
                Relative ID:  0

---------- Post updated at 04:03 AM ---------- Previous update was at 03:28 AM ----------

the plot thickens, after checking messages, I found the following. And the lun paths are offline/onlining constantly.

Code:
WARNING: kstat_create('mdi', 0, 'ssd301.t4.fp1'): namespace collisi
on
Oct 30 14:35:39 ldn-ux-kon02 genunix: [ID 834635 kern.info] /scsi_vhci/ssd@g60000970000298700009533031333037 (ssd301) multipath
 status: optimal, path /pci@3,700000/SUNW,emlxs@0,1/fp@0,0 (fp1) to target address: w50000975f0002585,4 is online Load balancin
g: round-robin

googling does not reaveal much. I'll see if I can log a case with Oracle.
Last edited by badoshi; 11-01-2013 at 06:35 AM..
 

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