device files in /dev/dsk

[vaman]

I have some entrys in /dev/dsk
like the one here .....
cr-------- 1 root root 203 0x700500 Nov 10 09:34 c112t0d5.pt

Pl note thet even if it is in /dev/dsk/ it is charactar device & c112t0d5.pt, what is this .pt is.

[Patrick Wallek]

It doesn't look like standard HP-UX to me. All the device files on one of my systems in /dev/dsk are the standard c?t?d? and are all block files.

[Stephen Keane]

Major number 203 belongs to sctl on my system. I have no idea what minor number 700500 is supposed to mean.

[Geoff Wild]

Is there a /dev/dsk/c112t0d5 file?

Sounds like you have EMC PowerPath installed.

I have them too.

Rgds...Geoff

[Slawomir Gora]

Hi,

run lssf command to check what is it
lssf /dev/dsk/c112t0d5.pt

Maby it is some robotic and someone is
using this name in backup software.

[Trond Haugen]

Interesting... Never seen a device file like that.
lsdev will show you that the major number is probably sctl. A driver usually used for th Initiator of the SCSI bus.
You could try a 'lssf /dev/dsk/c112t0d5.pt' to see if it gives any info.

Regards,
Trond

[Robert-Jan Goossens]

http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=762378

Looks like Victor has also got a .pt device file.

Robert-Jan

[Geoff Wild]

Well - my answer is wrong - not related to PowerPath....

Rgds...Geoff

[Geoff Wild]

Here's the answer - from HP:

"The .pt files are created by the diskmond for use with the SCSI Pass-Thru driver. The .pt files are necessary for the diskmond to gather monitor information for the disks. The diskmond monitor will use the .pt files to access the SCSI Pass-Thru driver. The monitor uses the Pass-Thru driver to collect status information.
If you do not plan to use the HA diskmond monitor, they can be removed. You can use the rmsf or the rm commands to remove the files. However if you plan to use the HA diskmond monitor, then the files are necessary. If the files do not exist, the disk monitor will recreate the .pt files each time it needs to collect the disk status for the monitor."

Rgds...Geoff

[TwoProc]

Geoff, I was just noticing those .pt files just the other day - wondering what they were and how they got there. Thanks for the info!!!