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Re: dd hangs when attempting to access a tape drive


From: Jim Meyering
Subject: Re: dd hangs when attempting to access a tape drive
Date: Sat, 22 Oct 2005 19:32:19 +0200

Curt Blank <address@hidden> wrote:
> Just curious, are you going to follow up and try to make it work again
> or let it go?

It sounds like a problem with an underlying driver.
I'm doubt it's worth trying to work around in dd.  Besides,
what can dd do?  If you request a block size of 32, it can't
very well opt to use 512 because using 32 might make hang a
buggy driver.

> I see what you mean, the perl script does this:
>
> read(3, "bbbbbb 2005-10-21T21:35:06-0500 "..., 4096) = 512
>
> Then this:
>
> write(1, "bbbbbb 2005-10-21T21:35:06-0500 ", 32) = 32

Did you try specifying just the *output* block size?
E.g., rather than using bs=32 (which sets both input and output
block sizes), specify only obs=32.




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