On Mon, Feb 03, 2003 at 08:54:01AM -0500, Barry Alexander wrote:
> Tapes are interchangeable between the two Dell servers, but not between the
> Dell and Compaq, or between the Dell servers and an RS/6000 system running
> AIX. In each of these tests, we receive the following message (when reading
> a Compaq or RS/6000 tape on a Dell server),
>
> cpio: read error: Input/output error
>
> We have carefully checked block sizes and cpio syntax generally, but to no
> avail. Is media compatibility between dissimilar systems achievable?
Well, yes, it's been a standard practice on Unix for decades.
You say you've check block sizes--but was that at the cpio level, or
for the underlying tape? Both have to be handled the same on all systems.
How about hardware compression? Make sure that's the same, too.
Diagnose from the bottom up--can you use 'dd' to stuff a block of data
out to the tape? Just use a text file. Then try 'dd' to drag it back
in on the same machine. Try to do the same import on another machine;
if this fails, you've low-level problems.
Once you figure out how to move simple unstructured data, and are sure
the tape blocking and compression are the same at the drive level,
THEN look at cpio. A common issue here is byte swabbing.
G'luck,
--
Dave Ihnat
[EMAIL PROTECTED]
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