I/O error using dd

[Romaric Guilloud]

>dd if=/dev/dbefr1/rlvol4 of=/dev/dbefr2_ref/rlvol4 bs=4096k
626+0 records in
625+1 records out
I/O error
>

Whereas OK for others rlvol I copy.
What can explain this repeated I/O error?

[Simon Hargrave]

is dbefr2_ref definately large enough to hold the whole of dbefr1? Perhaps it's getting to the end of the destination lv?

[Romaric Guilloud]

Yes Simon, the lvol have the same size!

[Geoff Wild]

Unmount it and do a fsck -F vxfs -o full

Rgds...Geoff

[Olivier Decorse · Accepted solution]

Possibilities :
1) dbefr2_ref/rlvol4 is to small to contains dbefr1/rlvol4. Check searching "LV Size" in lvdisplay -v /dev/dbefr2_ref/lvol4 and lvdisplay -v /dev/dbefr1_ref/lvol4
2) the disk inside the dbefr2_ref vg has a hard problem,
3) your SCSI control has a hard problem.

Olivier.

[Pete Randall]

Generally this is an indication of a problem with one of the drives. I assume that the drive is substantially larger than 626 * 4096K.

The classic test for a failed hard drive is to run dd against it like this:

dd if=/dev/rdsk/cNtNdN of=/dev/null bs=1024k

If you get an I/O error, your drive is probably due for replacement.

I would look through syslog for errors reported against this drive or run diagnostics against it.


Pete

[Romaric Guilloud]

Good guess Olivier, the LV are larger BUT as the initial lvextend was sized smaller it didn't work for this reason.
Thanks.

[Prashant Zanwar_4]

Hi,
Try recreating the LVOL and then do dd..That will be best.
Thanks
Prashant