topic Re: disk error in Operating System - HP-UX

disk error

Javier Ortiz Guajardo — Mon, 24 Mar 2003 17:13:02 GMT

i??ve receive this message in syslog
vmunix: LVM: vg[5]: pvnum=16 (dev_t=0x1f366400) is POWERF
AILED
vmunix: LVM: PV 16 has been returned to vg[5].

As you see the disk returned to work.

how can i identify which disk was power failed?.
where i locate the data PV 16 vg[5] and dev_t=0x1f366400

Thanks.

Re: disk error

Ross Zubritski — Mon, 24 Mar 2003 17:14:27 GMT

Physical Volume 16 in Volume Group 5.

Regards,

RZ

Re: disk error

Pete Randall — Mon, 24 Mar 2003 17:16:24 GMT

I believe that 0x1f366400 should translate to /dev/dsk/c3t6d0. Start there.

Pete

Re: disk error

Jeff Schussele — Mon, 24 Mar 2003 17:19:13 GMT

Hi Javier,

If my hex math is correct that device should be

/dev/dsk/c54t6d4

After the 0x this is how to decode.
First 2 digits are the drive decimal 31 in this case
Next 2 digits are controller in hex - decimal 54 here
Next digit is SCSI ID or "t" value - 6 here
Next didgit is LUN or "d" value - 4 here

So this works out to c54t6d4

HTH,
Jeff

Re: disk error

S.K. Chan — Mon, 24 Mar 2003 17:22:39 GMT

In addtion to the rest, this may be a low timeout problem with the disk. You can modify it with pvchange (-t option). I think the default is 30sec. You might want to increase it to say 60sec.

Re: disk error

Jeff Schussele — Mon, 24 Mar 2003 17:22:59 GMT

Oops...should have been...

First 2 digits are the driver - decimal 31 in this case.

Jeff

Re: disk error

Sridhar Bhaskarla — Mon, 24 Mar 2003 17:25:11 GMT

Jeff is precisely correct. The disk is c54t6d4.

Do a "pvdisplay /dev/dsk/c54t6d4" and get the VG name if your /etc/lvmtab is too large to search.

-Sri

Re: disk error

Steven E. Protter — Mon, 24 Mar 2003 17:35:44 GMT

Check the power cable on the disk array or disk. Take a look for dangling plugs. We had someone disconnect power to an old HP-6000 disk array while labeling cables for a move.

SEP

Re: disk error

Ross Zubritski — Mon, 24 Mar 2003 17:37:35 GMT

What the heck is it with people and power cords here lately?? sheesh ;)

Regards,

RZ

Re: disk error

Javier Ortiz Guajardo — Mon, 24 Mar 2003 17:54:09 GMT

all i want is to translate the message and found which disk was power failed.

I did this:
for message dev_t=0x1f366400
ll /dev/dsk |grep 366400
brw-r----- 1 bin sys 31 0x366400 Mar 2 2001 c54t6d4

for message vg[5]
ll /dev/vgprd4/group
crw-rw-rw- 1 root sys 64 0x050000 Oct 23 2000 /dev/vgprd4/group

for pvnum=16
vgdisplay -v /dev/vgprd4
PV Name /dev/dsk/c39t2d4
PV Name /dev/dsk/c39t2d5
PV Name /dev/dsk/c39t2d6
PV Name /dev/dsk/c39t2d7
PV Name /dev/dsk/c42t10d0
PV Name /dev/dsk/c42t10d1
PV Name /dev/dsk/c42t10d2
PV Name /dev/dsk/c42t10d3
PV Name /dev/dsk/c42t10d4
PV Name /dev/dsk/c42t10d5
PV Name /dev/dsk/c42t10d6
PV Name /dev/dsk/c42t10d7
PV Name /dev/dsk/c54t6d0
PV Name /dev/dsk/c54t6d1
PV Name /dev/dsk/c54t6d2
PV Name /dev/dsk/c54t6d3
PV Name /dev/dsk/c54t6d4

But as you see the c54t6d4 is number 17 if you start to count from 1, If you start from 0 the is 16.

all i need is someone can tell me if this translate is correct to be exactly sure which disk was power failed?

Thanks.

Re: disk error

Rita C Workman — Mon, 24 Mar 2003 17:55:52 GMT

One last thing to check...got same error...extending the timeout didn't help in my case. Turned out my HBA was flaking in and out and had to be replaced.

Rgrds,
Rita

Re: disk error

Ross Zubritski — Mon, 24 Mar 2003 17:56:09 GMT

Start from 0.

Regards,

RZ

Re: disk error

Pete Randall — Mon, 24 Mar 2003 18:12:31 GMT

I need a refresher course in hex! Forget my misguided answer, please.

Pete

Re: disk error

Ross Zubritski — Mon, 24 Mar 2003 18:13:05 GMT

We still love you Pete! (Sort of)

RZ

Re: disk error

Pete Randall — Mon, 24 Mar 2003 18:14:07 GMT

Yes, c54t6d4 is correct.

Pete

Re: disk error

Jon Finley — Tue, 25 Mar 2003 04:54:01 GMT

Assumming that this is your Oracle/Sybase/SQL data disk, AND that the disk is returned to service each time, then it may simply be unable to reply back within the default 30 seconds.

Rita's correct though. If changing the timeout value (pvchange) doesn't resolve the problem, you may be looking at replacing the disk.

And... yes you've found the correct disk at c56t6d4.

Jon