topic Checking a Raw Partition in Operating System - HP-UX

Checking a Raw Partition

Kevin Keller_2 — Fri, 21 Apr 2006 07:23:58 GMT

I'm running Informix IDS 9.40.FC5 on HPUX 11.11. I suspect I may have a problem with one of the raw partitions. How can I check the partitions, since normal disk checking is useless. Thank you.

Re: Checking a Raw Partition

Steven E. Protter — Fri, 21 Apr 2006 07:27:35 GMT

Shalom Kevin,

Two choices:

1) A utility provided by Informix (I had SAG Adabas raw in a previous job and we had utilities for checking)

2) dmesg - # followed by a dmesg

If there are messages involving the physical disks the raw partition is sitting on, then you are correct.

pvdisplay will show you whats on what disk.

SEP

Re: Checking a Raw Partition

RAC_1 — Fri, 21 Apr 2006 07:28:15 GMT

If you askign about checking the integrity of the data, there might be tools within informix. At unix level, you can run a dd on the raw lvol and check it.

dd if=/dev/vgxx/rlvolx of=/dev/null bs=1k

If it reports error, there might be problems with it. Also checl dmesg and syslog.log, diskinfo and check disk with STM.

Re: Checking a Raw Partition

Steve Lewis — Fri, 21 Apr 2006 08:25:44 GMT

oncheck -cE
does an extent check on all chunks; run when the system is quiet.

oncheck -cDI databasename
to verify data/index integrity and rebuild if necessary.

oncheck --
for the full list of options.

The dd command above will give you an i/o error if it encounters one, you can also run that on the raw logical volume.

armdsp -i to get your arrayid, then
armdsp -a arrayid to check the array for errors.
Sometimes is called amdsp; I don't know why they changed it.
You could also try commandview.

After that there is logprn, amlog/armlog, but you might like to get the response center's help with those.

Re: Checking a Raw Partition

Steve Lewis — Fri, 21 Apr 2006 08:28:30 GMT

oops wrong way round- the dd command can also be run on the /dev/rdsk/cXtYdZ lun/disk. Dont forget: rdsk, not dsk

Specify a blocksize of at least a megabyte, possibly as much as 8mb.