---- Original message ----
>Date: Thu, 9 Nov 2006 10:57:30 +0000
>From: mark wragge <mark_t_wragge AT YAHOO DOT IE>  
>Subject: [Networker] Why do I see this message - (NDMP) reading:Input/Output 
>error  
>To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
>
>I have configured an EMC Celerra for backup using NDMP protocol in a Shared 
>tape environment. Each time i start the NDMP backup 
the the following error is produced when the tape is put into the tape drive --
>  rd=emc-nas:c32t0l0 (NDMP) reading:Input/Output error.
>  The backup is successful and the tape drive appears to write and read 
> correctly. Any ideas why this message is being produced 
and how can I prevent it.
>  I have Not configured the timers on the Library properties apart for the 
> idel device dismount option which is now 2 minutes.
 
In my NetWorker data zone, a seimilar thing happens every time an NDMP backup 
starts. I
back up six Mirapoint email servers via NDMP nightly and every time a backup 
starts, there
are errors like the ones you described and errors at the end, right before the 
bootstrap
save set is generated. As far as I know, those sorts of errors can be ignored, 
at least that
is how it works here. I can restore NDMP data fine, despite those errors.

What's most important is to verify that your data can be restored. Do not take 
it on faith
that restores will always work; you need to test them periodically. This is 
true for any type
of backup, but it is especially true for NDMP backups.

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