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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