HP-UX 11i v3 Native Multi-Pathing for Mass Storage (August 2012)

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The following messages are immediately logged in /var/adm/syslog/syslog.log:
Jan 31 02:41:48 hpfcs835 vmunix: class : tgtpath, instance 3
Jan 31 02:41:48 hpfcs835 vmunix: Target path (class=tgtpath, instance=3) has gone online.
The target path h/w path is 0/2/1/0.0x500508b3009097f9
Jan 31 02:41:48 hpfcs835 vmunix: class : tgtpath, instance 6
Jan 31 02:41:48 hpfcs835 vmunix: Target path (class=tgtpath, instance=6) has gone online.
The target path h/w path is 0/4/1/0.0x500508b3009097f9
As a result of the target port 0x500508b3009097f9 coming back online, all the lunpaths using this SAN
component become available again. The
ioscan command shows these lunpaths with a CLAIMED
state. Using
scsimgr, gather some statistics for online events on the target path and lunpath path:
# scsimgr get_stat -H 0/4/1/0.0x500508b3009097f9.0x4014000000000000
STATISTICS FOR LUN path : 0/4/1/0.0x500508b3009097f9.0x4014000000000000
Generic Statistics:
…
Offline events = 1
Online events = 1
…
Using sar, observe that I/O operations are still going from disk15 to disk16 on all lunpaths:
# sar -L 1 5
HP-UX hpfcs835 B.11.31 U 9000/800 02/01/07
16:41:10 lunpath %busy avque r/s w/s blks/s avwait avser
%age num num num num msec msec
disk15_lunpath18 7.92 0.50 122 0 122 0.00 0.6
disk15_lunpath3 5.94 0.50 0 122 122 0.00 0.4
disk15_lunpath24 23.76 0.50 0 121 121 0.00 1.9
disk15_lunpath10 9.90 0.50 122 0 122 0.00 0.8
disk16_lunpath19 5.94 0.50 122 0 122 0.00 0.4
disk16_lunpath4 15.84 0.50 121 0 121 0.00 1.2
disk16_lunpath23 21.78 0.50 0 122 122 0.00 1.7
disk16_lunpath11 7.92 0.50 0 122 122 0.00 0.6
…
The ioscan command shows that LUN and lunpath health is set back to online automatically.
# ioscan -P health
Class I H/W Path health
…
tgtpath 7 0/2/1/0.0x500508b3009097f1 online
lunpath 15 0/2/1/0.0x500508b3009097f1.0x0 online
lunpath 16 0/2/1/0.0x500508b3009097f1.0x4014000000000000 online
lunpath 19 0/2/1/0.0x500508b3009097f1.0x4015000000000000 online
lunpath 17 0/2/1/0.0x500508b3009097f1.0x4016000000000000 online
lunpath 18 0/2/1/0.0x500508b3009097f1.0x4017000000000000 online
lunpath 20 0/2/1/0.0x500508b3009097f1.0x4018000000000000 online
tgtpath 3 0/2/1/0.0x500508b3009097f9 online
lunpath 0 0/2/1/0.0x500508b3009097f9.0x0 online
lunpath 5 0/2/1/0.0x500508b3009097f9.0x4014000000000000 online
lunpath 4 0/2/1/0.0x500508b3009097f9.0x4015000000000000 online
lunpath 1 0/2/1/0.0x500508b3009097f9.0x4016000000000000 online
lunpath 3 0/2/1/0.0x500508b3009097f9.0x4017000000000000 online
lunpath 2 0/2/1/0.0x500508b3009097f9.0x4018000000000000 online
ba 3 0/3 N/A
slot 1 0/3/1 N/A
fc 1 0/3/1/0 online
fc 2 0/3/1/1 online
ba 4 0/4 N/A
slot 2 0/4/1 N/A
fc 3 0/4/1/0 online
tgtpath 8 0/4/1/0.0x500508b3009097f1 online
lunpath 21 0/4/1/0.0x500508b3009097f1.0x0 online
lunpath 22 0/4/1/0.0x500508b3009097f1.0x4014000000000000 online
lunpath 23 0/4/1/0.0x500508b3009097f1.0x4015000000000000 online
lunpath 26 0/4/1/0.0x500508b3009097f1.0x4016000000000000 online
lunpath 24 0/4/1/0.0x500508b3009097f1.0x4017000000000000 online
lunpath 25 0/4/1/0.0x500508b3009097f1.0x4018000000000000 online