topic Re: HP-UX 11.00 FileSystem Copy with fabackup or dd or tar. in Operating System - HP-UX

HP-UX 11.00 FileSystem Copy with fabackup or dd or tar.

Raj D. — Fri, 18 Jun 2004 10:48:11 GMT

Hi All ,

Can any one tell me , how to backup files system to another filesystem , using (1) fbackup or (2)dd or (3)tar command.

I have two file system

/data1 size 1GB used=800MB
/data2 size 1GB used=0MB.

can i copy all files and dirs of /data1 filesystem , to /data2 filesystem using fbackup or dd. both are vxfs filesystem.

I beleive this will be faster and accurate than cp command.
Thanks in advance.

Raj. D.
--------

Re: HP-UX 11.00 FileSystem Copy with fabackup or dd or tar.

Jeff_Traigle — Fri, 18 Jun 2004 10:53:19 GMT

This should do the trick...

(cd /data1; tar cf - .) | (cd /data2; tar xvf -)

Re: HP-UX 11.00 FileSystem Copy with fabackup or dd or tar.

Robert-Jan Goossens — Fri, 18 Jun 2004 10:53:49 GMT

Hi,

You can use cpio.

# find /data1 | cpio -pcmudv /data2

Regards,
Robert-Jan
Ps, to gain extra speed remove the -v option.

Re: HP-UX 11.00 FileSystem Copy with fabackup or dd or tar.

Pete Randall — Fri, 18 Jun 2004 10:54:05 GMT

Any of those methods should work, some maybe better than others. My personal approach is to run "find /data1 -print |cpio -pdumxl /data2".

Pete

Re: HP-UX 11.00 FileSystem Copy with fabackup or dd or tar.

Fabio Ettore — Fri, 18 Jun 2004 10:54:17 GMT

Hi,

it is not needed fbackup filesystem, just copy it!

http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=611082

Check thread above, it has a lot of suggestions about that.
My one was:

# cd /data1
# find . -xdev -print | cpio -pdmvux /data2

I suggest you to compare two directories at the end:

# diff /data1 /data2

HTH.

Best regards,
Ettore

Re: HP-UX 11.00 FileSystem Copy with fabackup or dd or tar.

Raj D. — Fri, 18 Jun 2004 11:54:57 GMT

Thanks ,

Jeff , Robert , Pete & Etore , and who all replied. The Problem solved , with , solution of :

1] Jeff & 2] Ettore .

The command given by robert is creating one more directory called data1 under /data2

i.e
Robert:
# find /data1 | cpio -pcmudv /data2

Pete:
# find /data1 -print | cpio -pdumxl /data2

creates one more directory.
i.e /data2/data1/....under /.

This two works fine.
of Jeff and Etorre ,

Thanks to all .
--------------
Raj. D.
-------

Re: HP-UX 11.00 FileSystem Copy with fabackup or dd or tar.

Raj D. — Fri, 18 Jun 2004 12:00:37 GMT

Hi All ,

This command i have tried and found good result.

# umount /data2
# dd if=/dev/vg01/data1 of=/dev/vg01/data2
# fsck /dev/vg01/data2
# mount -F /dev/vg01/data2 /data2

# diff /data1 /data2

Found OK.

Thanks to all who replied ,

Raj.D

Re: HP-UX 11.00 FileSystem Copy with fabackup or dd or tar.

Victor Fridyev — Fri, 18 Jun 2004 12:29:25 GMT

Hi,

I use this method as well, just take into account that it's good only if logical volumes size is equal.
PS. It's better to use /dev/vgxx/rlvol and not lvol. You can change bs in dd command in order to accelerate the process.

HTH

Re: HP-UX 11.00 FileSystem Copy with fabackup or dd or tar.

Raj D. — Sun, 20 Jun 2004 05:15:49 GMT

Thanks Victor..

But Whats the Block size to be used , to accelarate the dd operation.
is it bs=64 . ?

Raj. D.

Re: HP-UX 11.00 FileSystem Copy with fabackup or dd or tar.

Bernhard Mueller — Mon, 21 Jun 2004 04:26:05 GMT

Raj,

although cpio passthrough copying, as recommended by others, is the most common method, in terms of performance for copying an entire filesystem you can hardly beat dd (you found out yourself).

The only things to be aware of are:
target rlvol must be the same size or larger than the source rlvol.
(if larger, you simply run extendfs on the target rlvol after the copy is done and before mounting it)

Blocksize should be between 256k and 4096k.
Whether this actually makes a difference, is hard to tell because it depends on the system configuration. I found 256k suitable for most situations.

Especially if you have filesystems with tens or hundreds of thousands of files the dd method will save you *hours* compared to cpio.

Regards,
Bernhard

Re: HP-UX 11.00 FileSystem Copy with fabackup or dd or tar.

Raj D. — Mon, 21 Jun 2004 04:48:47 GMT

Hi Bernhard ,

Thats a good one , well i ll try it out.
I believe system with good resources , i.e CPU / RAM , will give good acceleration to dd for block size 256 and 4096. With Large File system say 10/20GB or more.

For a huge number of files cpio is slow its true.

Thanks for showing me the light ,

Raj D.
------

Re: HP-UX 11.00 FileSystem Copy with fabackup or dd or tar.

Geoff Wild — Mon, 21 Jun 2004 08:00:55 GMT

I prefer to use vxdump/vxrestore - fastest way I have seen:

vxdump -0 -f - -s 1000000 -b 16 /data1 | (cd /data2 ; vxrestore rf -)

Rgds...Geoff

Re: HP-UX 11.00 FileSystem Copy with fabackup or dd or tar.

Raj D. — Mon, 05 Jul 2004 22:33:48 GMT

Thanks al who replied ,

Thanks to Geoff for the another way to do it .. 10 points to Geoff.

It can be achived via fbackup / frecover also, its apprciable if any one help it out.

Regards ,

Raj D.