dump | restore fails: unknown tape header type 1853384566

[cpghost]

On Wed, Mar 25, 2009 at 12:04:18PM -0400, Mikhail T. wrote:
> Generally, when dumping read-write mounted filesystems, one is
> supposed to use snapshots, but that is very buggy on its own
> (leading to kernel crashes), so it is safer to rely on the FS being
> "idle", if it can not be forced into read-only for some other
> reason.

Perhaps your kernel/world is not recent enough? There used to be
problems with snapshots, including hangs or crashes, but IIRC, they
disappeared completly a couple of months ago, at least for me. (no,
sorry, I can't pinpoint the exact date, and much less the exact
revision nr).

Snapshots alone, and dump -L + restore (on RELENG_7/amd64) working
flawlessly here on 20+ rack-mounted servers; some to tape, some to
SAN, but I'm probably just lucky.

BTW, that's what makes this problem so intractable: those who could
debug it, can't reproduce it on their machines. It's scary to know
there's a bug lurking in there.

>     -mi

-cpghost.

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