...
I/O transfer Statistics:
Bytes read = 22816
Bytes written = 912
Total I/Os processed = 512
Asynchronous IO read failures = 0
Asynchronous IO write failures = 0
i.
In HP-UX 11i v3, a device WWN (HP 3PAR Storage System VV) is closely tied to its
exported LUN ID (HP 3PAR Storage System VLUN). When seeing a different device WWN
(HP 3PAR Storage System VV) on a previously used LUN ID (VLUN) to prevent data
corruption, the host puts the LUN into an
authentication failure
state where the LUN path
cannot be used for I/O transfer. This state causes the host to log a message in
/var/adm/syslog/syslog.log
and on the console to alert the user. The user should
rely on these messages and should apply the recommended corrective action, which
usually consists of running the
scsimgr replace_wwid
command.
NOTE:
scsimgr replace_wwid
replaced the
fcmsutil replace_dsk
option
used in earlier HP-UX releases.
Example: issuing
showremovevlun
and
createvlun
shows that the HP 3PAR Storage
System volume oracle1 is exported as LUN 6 and seen as
/dev/rdisk/disk22
on the
host.
# showvv -d
590 oracle1 RW 0/1/- --- --- --- --- - 50002AC0024E0036
Tue Oct
30 19:31:59 PDT 2007
591 oracle2 RW 1/0/- --- --- --- --- - 50002AC0024F0036
Tue Oct
30 19:32:01 PDT 2007
# showvlun -a
Lun VVname Host -Host_WWN/iSCSI_Name- Port Type
6 oracle1 sqahpit2 50060B000068D5A4 0:4:2 host
6 oracle1 sqahpit2 50060B00001D1192 1:5:2 host
On the host, the following
ioscan
commands show that the host recognizes the VV.
# ioscan -kfnNC disk
Class I H/W Path Driver S/W State H/W Type Description
===================================================================
disk 22 64000/0xfa00/0x244 esdisk CLAIMED DEVICE 3PARdataVV
/dev/disk/disk22 /dev/rdisk/disk22
# ioscan -kfnNC lunpath
Class I H/W Path Driver S/W State H/W Type Description
==================================================================
....
lunpath 19 0/0/4/1/0.0x20420002ac000036.0x4006000000000000 eslpt CLAIMED
LUN_PATH LUN path for disk22
lunpath 20 0/0/4/1/1.0x21520002ac000036.0x4006000000000000 eslpt CLAIMED
LUN_PATH LUN path for disk22
# scsimgr get_attr -D /dev/rdisk/disk22
...
current = 0x50002ac0024e0036 --> Oracle1
28
Allocating Storage for Access by the HP-UX Host
