topic Re: device files in /dev/dsk in Operating System - HP-UX

device files in /dev/dsk

vaman — Wed, 19 Jan 2005 09:23:16 GMT

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.

Re: device files in /dev/dsk

Patrick Wallek — Wed, 19 Jan 2005 09:29:35 GMT

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.

Re: device files in /dev/dsk

Stephen Keane — Wed, 19 Jan 2005 09:32:36 GMT

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

Re: device files in /dev/dsk

Geoff Wild — Wed, 19 Jan 2005 09:32:41 GMT

Is there a /dev/dsk/c112t0d5 file?

Sounds like you have EMC PowerPath installed.

I have them too.

Rgds...Geoff

Re: device files in /dev/dsk

Slawomir Gora — Wed, 19 Jan 2005 09:32:50 GMT

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.

Re: device files in /dev/dsk

Trond Haugen — Wed, 19 Jan 2005 09:35:55 GMT

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

Re: device files in /dev/dsk

Robert-Jan Goossens — Wed, 19 Jan 2005 09:38:24 GMT

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

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

Robert-Jan

Re: device files in /dev/dsk

Geoff Wild — Wed, 19 Jan 2005 09:43:38 GMT

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

Rgds...Geoff

Re: device files in /dev/dsk

Geoff Wild — Wed, 19 Jan 2005 10:27:09 GMT

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

Re: device files in /dev/dsk

TwoProc — Thu, 20 Jan 2005 19:45:12 GMT

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!!!