backup strategies
Eric Schuele
e.schuele at computer.org
Mon Oct 31 08:53:57 PST 2005
Csaba Henk wrote:
> On Mon, Oct 31, 2005 at 09:40:16AM -0600, Eric Schuele wrote:
>
>>How do snapshots work and how do they provide the consistency necessary
>>for a dump?
>
> [...]
>
>>SoftUpdates are required on the filesystem.
>
>
> This sounds beautiful. I am amazed. I knew of softupdates, but they were
> always a shady corner of my understanding of BSD.
>
> So live fs dumping is based on the great hackery of softupdates. Fine,
> but in this case... shouldn't the man page make a mention of it?
The online manual mentions it in 16.13. Wouldn't hurt for it to be in
the man page as well.
>
> It just says that -L is ignored in case of unmounted/ro mounted fs-s,
> or if there is no proper .snap dir. But it doesn't say that it will be
> ignored if softupdates is not turned on...
>
> Going a bit off: which OS-es provide this live snapshot dumping
> capability? FreeBSD? FreeBSD >= 5.x ? *BSD ? Maybe something else?
AFAIK FreeBSD 5.0+. Other *BSD as well, i believe... but someone else
would have to answer that.
> (AFAIK, softupdates is supported also in other members of the BSD
> family, yet the NetBSD dump manpage didn't have such a -L flag...)
>
--
Regards,
Eric
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