HP 3PAR HP-UX Implementation Guide

h. You can use the get_stat option to obtain the statistics of a given device and for debug
purposes.
# scsimgr get_stat -D /dev/rdisk/disk6
STATISTICS FOR LUN :/dev/rdisk/disk6
Generic Statistics:
...
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 StoreServ Storage VV) is closely tied to its
exported LUN ID (HP 3PAR StoreServ Storage VLUN). When seeing a different device
WWN (HP 3PAR StoreServ Storage 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 the showvv and showvlun commands shows that the HP 3PAR
StoreServ Storage volume oracle1 is exported as LUN 6 and seen as
/dev/rdisk/disk22 on the host.
On the host, the following ioscan commands show that the host recognizes the VV.
Setting Up Multipathing Software on HP-UX 11i v3 29