Difference between cpio copy and tar copy
From: Steven Sim (steven.sim_at_faplccc.net)
Date: 03/24/05
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To: <sunmanagers@sunmanagers.org> Date: Thu, 24 Mar 2005 19:28:30 +0800
Hello Sun Gurus;
I recently had to dump almost 100 Gbyte of data from a mounted read only
vxfs volume to a newly formatted ufs mount point.
So I used the following command
#cd /<source directory>
#find . | cpio -pdmv <target directory>
Lo and behold, the above command worked.
To a point. It ended after copying about 23 Gbyte of data with the following
messages;
.
.
.
/xxyy/qerust/abcdefg.LOG
48581232 blocks
3 error(s)
Why did it stop before the whole directory was copied? Surely not because of
the 3 errors! The 3 errors occurred somewhere in the middle of the cpio
operation well before the cpio stopped seemingly gracefully.
I had thought cpio was a lot more advanced than a simple cp operation.
My colleague subsequently asked me to use the following command
#cd /<source directory>
#tar -cf - * | (cd /<target directory>;tar -xf -)
Which successfully copied the whole thing.
My question is why did cpio not worked properly and which of the above
command is more appropriate for a large copy operation? And which is faster?
Warmest Regards
Steven Sim
Service Delivery Manager
Fujitsu Asia Pte Ltd
Company Registration Number 199701545D
20 Science Park Road
#03-01 Teletech Park
Singapore Science Park II
Singapore 117674
Tel: +65-6512-7555
DID: +65-6512-7616
Fax: +65-6512-7600
Fujitsu Asia Pte. Ltd.
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