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

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tgtpath 3 0/2/1/0.0x500508b3009097f9 offline
lunpath 0 0/2/1/0.0x500508b3009097f9.0x0 offline
lunpath 5 0/2/1/0.0x500508b3009097f9.0x4014000000000000 offline
lunpath 4 0/2/1/0.0x500508b3009097f9.0x4015000000000000 offline
lunpath 1 0/2/1/0.0x500508b3009097f9.0x4016000000000000 offline
lunpath 3 0/2/1/0.0x500508b3009097f9.0x4017000000000000 offline
lunpath 2 0/2/1/0.0x500508b3009097f9.0x4018000000000000 offline
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
tgtpath 6 0/4/1/0.0x500508b3009097f9 offline
lunpath 8 0/4/1/0.0x500508b3009097f9.0x0 offline
lunpath 13 0/4/1/0.0x500508b3009097f9.0x4014000000000000 offline
lunpath 11 0/4/1/0.0x500508b3009097f9.0x4015000000000000 offline
lunpath 12 0/4/1/0.0x500508b3009097f9.0x4016000000000000 offline
lunpath 10 0/4/1/0.0x500508b3009097f9.0x4017000000000000 offline
lunpath 9 0/4/1/0.0x500508b3009097f9.0x4018000000000000 offline
…
disk 13 64000/0xfa00/0x1 limited
disk 14 64000/0xfa00/0x2 limited
disk 15 64000/0xfa00/0x3 limited
disk 16 64000/0xfa00/0x4 limited
disk 17 64000/0xfa00/0x5 limited
Using the scsimgr command, gather statistics for offline events and I/O errors on the lunpath path:
# scsimgr get_stat -H 0/2/1/0.0x500508b3009097f9.0x4014000000000000
...
Offline events = 1
Online events = 0
...
I/O transfer Statistics:
Bytes read = 1426794
Bytes written = 0
Total I/Os processed = 12215
I/O failures = 1
Retried I/Os = 2
Retried I/O failures = 0
Some I/O operation errors are expected because I/O operations might have been pending on the
lunpaths that were taken offline when the target port was disconnected. However, it is critical to
observe that the transfer of data is uninterrupted because of lunpath failover. You can verify this by
running the
sar command, which shows I/O activity on the remaining two active lunpaths for disk15
and disk16:
# sar -R -L -d 1 5
HP-UX hpfcs835 B.11.31 U ia64 02/01/07
03:38:16 lunpath %busy avque r/s w/s blks/s avwait avserv
%age num num num num msec msec
device %busy avque r/s w/s blks/s avwait avserv
disk15_lunpath18 27.00 0.50 534 0 534 0.00 0.51
disk16_lunpath19 17.00 0.50 0 533 533 0.00 0.33
disk16_lunpath23 18.00 0.50 0 534 534 0.00 0.32
disk15_lunpath24 27.00 0.50 533 0 533 0.00 0.51
disk15 55.00 0.50 1066 0 1066 0.00 0.51
disk16 35.00 0.50 0 1067 1067 0.00 0.33
Now, reconnect the target port of world wide name 0x500508b3009097f9.