[H-GEN] Hardware Upgrade
Sarah Hollings
sarah at humanfactors.uq.edu.au
Mon Jan 6 20:56:30 EST 2003
[ Humbug *General* list - semi-serious discussions about Humbug and ]
[ Unix-related topics. Posts from non-subscribed addresses will vanish. ]
Robert Brockway wrote:
> [ Humbug *General* list - semi-serious discussions about Humbug and ]
> [ Unix-related topics. Posts from non-subscribed addresses will vanish. ]
>
> On Tue, 7 Jan 2003, Bradley Marshall wrote:
>
>
>>``So anybody who depends on "dump" getting backups right is already playing
>>russian rulette with their backups. It's not at all guaranteed to get the
>>right results - you may end up having stale data in the buffer cache that
>>ends up being "backed up".
>
>
> I have seen this before but I guess I don't understand _why_ it might get
> stale data from the buffer cache. Surely if tar & cpio can guarantee
> correct information dump should be able to as well (it looks at the
> filesystem at a lower level than other tools anyway).
>
> Still, getting stale data and data corruption are two entirely different
> things. Even a journaling filesystem won't always guarantee recovery of
> the latest data after a crash, only consistent data. Readers may wish to
> see the "data" option in mount(8) for further info on this.
>
Theoretically if you used an XFS filesystem, and SGI's xfsdump and
restore, _and_ you use the posix acl's option when you compile your XFS
kernel, you ought to be able to do backups that preserve ACL's.
Then maybe you could use samba's ability to map ACL's and use xfsdump
over an smbfs pipe to get ntfs backed up with acls. In theory. Maybe.
Does anyone know of this being acheived?
--
Sarah Hollings IT Manager
sarah at humanfactors.uq.edu.au The ARC Key Centre
Ph +61 7 33656080 for Human Factors and
Mb +61 416 045401 Applied Cognitive Psychology
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