Showing results for 
Search instead for 
Did you mean: 

vxdump && vxrestore

Joao Rei
Frequent Advisor

vxdump && vxrestore


Im running HP-UX ia 11.31

When running the following command I get these messages:

# vxdump 0f - /ORIGINAL/ | vxrestore xf -

vxfs vxdump: WARNING: no file `/etc/dumpdates', making an empty one
vxfs vxdump: Date of this level 0 dump: Wed May 7 13:25:05 2008
vxfs vxdump: Date of last level 0 dump: the epoch
Dumping /dev/vg00/roriginal (/ORIGINAL) to stdout
vxfs vxdump: mapping (Pass I) [regular files]
vxfs vxdump: mapping (Pass II) [directories]
vxfs vxdump: estimated 270238 blocks (131.95MB) on 0.88 tape(s).
vxfs vxdump: dumping (Pass III) [directories]
vxfs vxdump: dumping (Pass IV) [regular files]
vxfs vxdump: vxdump: 135371 tape blocks
vxfs vxdump: vxdump is done
vxfs vxrestore: V-3-23503: Unable to set unbuffered I/O for ./jmrei: Function is not available
set owner/mode for '.'? [yn] vxrestore interrupted, continue? [yn]

Can anyone tell me the meaning of "unbuffered I/O for...Function is not available" ?

Best Regards,

Joao Rei

Honored Contributor

Re: vxdump && vxrestore

The unbuffered I/O function is actually VX_UNBUFFERED function.

I don't know what ./jmrei points to but I would check the fstab for the FS related settings.

I guess this function is available if the OnlineJFS is installed.
Occasional Visitor

Re: vxdump && vxrestore



sorry to revive this post after such a long time, but I'm having the same issue here and it is not clear to me, what to do with it.


The facts:


We are running HP-UX 11.23 (ia) here and I'm doing a number of backup/restore tests. During the procedure, I did


vxdump -0 -f <dumpfile> /home


removed and recreated the LV, where /home resides on, then did


cd /home

vxrestore -r -f <dumpfile>


The /etc/fstab entry for /home reads (and has not changed):


/dev/vg00/lvol5 /home vxfs delaylog 0 2


During the restore, I get


vxfs vxrestore: Unable to set unbuffered I/O for <file>: Function is not available


for virtually any file being processed. Apart from that, vxrestore seems to do its job.


The questions:


- Unfortunately, the link provided by the poster above me has expired and points only to the general "where you can find what after our major overhaul" document. Could someone give the current link?

- Is it safe to just ignore the "Unable to set unbuffered..." messages as far as one is only concerned with the exact restoration of the data?


Thanks in advance for any help and pointers.


Best regards,