When attempting to configure FT devices on an HPUX client, devices that should be present on the SAN are displayed as 'NO_HW' in ioscan output. Attempts to use these devices are unsuccessful.
ext_bus 63 3/0/10/1/0/4/0.101.12.255.0 fcd_vbus NO_HW INTERFACE FCP Device Interface target 176 3/0/10/1/0/4/0.101.12.255.0.0 tgt NO_HW DEVICE tape 7 3/0/10/1/0/4/0.101.12.255.0.0.0 stape NO_HW DEVICE ARCHIVE Python tape 8 3/0/10/1/0/4/0.101.12.255.0.0.1 stape NO_HW DEVICE ARCHIVE Python
Mar 1 11:13:58 FTclient1 vmunix: class : lunpath, instance 3104 Mar 1 11:13:58 FTclient1 vmunix: Evpd inquiry page 83h/80h failed or the current page 83h/80h data do not match the previous known page 83h/80h data on LUN id 0x0 probed beneath the target path (class = tgtpath, instance = 37) The lun path is (class = lunpath, instance 3104).Run 'scsimgr replace_wwid' command to validate the change
from scsimgr man page:
To prevent accidental data corruption, the SCSI stack implements an authentication mechanism based on the LUN WorldWide Identifer (WWID). When a LUN with a different WWID is discovered through a previously discovered LUN path, further access to the device through that LUN path is prevented. The LUN path is put in "Authentication Failure" state. Then, HP-UX logs a message in syslog which informs the user that the replace_wwid operation needs to be performed.
If the user has intentionally replaced the LUN, the scsimgr replace_wwid command must be run to authorize the re-use of that LUN path for a different LUN.
In some situations, a replacement of a target controller may cause LUN paths of corresponding target paths to be put in authentication failure state. To validate the replacement and re-authorize all the affected paths, scsimgr replace_wwid can be used with the target path identifer.
Validate that the devices are ARCHIVE Python and if so, run the HPUX command:
scsimgr -f replace_wwid -C lunpath -I XXXX
replacing XXXX with the lunpath from the syslogd error message or the lunpath from the output of
ioscan -fN|grep lunpath|grep tape
for the NO_HW devices.