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SubjectRe: Q: 2.4.[37]-XFS: /dev/nst0m: cannot allocate memory
Kai Makisara wrote:
>
> On Fri, 17 Aug 2001, (Martin Jacobs) wrote:
>
> > Hi all,
> >
> > I cannot read anything from my tape (Tandberg DLT8000, LVD
> > interface, ID=5) connected to an aic7899 or an sym53c895 using
> > kernel 2.4.3-XFS or 2.4.7-XFS. (Everything works fine on
> > 2.2.16.) Loading of st.o works. stinit works. mt (status, tape
> > positioning) works. But when I try to read the amanda header
> > from the tape (dd if=/dev/nst0m bs=32k count=1) I get the
> > error
> >
> > dd: reading `/dev/nst0m': Cannot allocate memory
> >
> ...
> > Nearly the same for tar (with default block size of 512 byte).
> >
> > BUT: if I use bs=64k it works!!?
> >
> In variable block mode in 2.4, you get ENOMEM if the block on the tape is
> larger than the byte count in the read(). 2.2 just returned what you asked
> for and silentlry threw away the rest of the block. If the byte count is
> larger than the block size, then the block is returned.
>
> I.e., the first block on your tape is larger than 32 kB.
>
> Kai

If I understand you right this is a FEATURE, not a bug! I find it quite
irritating when using a tape device. Shouldn't I get some error message
about wrong block size?
Forgive me but I am some sort of end user (admin) and not a kernel
hacker.
BTW, where can I get documentation about this 'feature'?

Thanks anyway!

--
albrecht jacobs

jangled nerves gmbh
hallstrasse 25
d-70376 stuttgart

fon: +49 711 550375-44
fax: +49 711 550375-22

mailto:albrecht.jacobs@janglednerves.com
http://www.janglednerves.com/
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