Help Failing Disk Problem
charpentierfx at yahoo.com
Mon Nov 5 15:07:48 PST 2007
The mention of dump '-L' in your email below has caught my attention.
Pardon my ignorance, but what is the '-L' option?
I looked it up in the man pages but wasn't able to find any mention of it.
Can you point me in the right direction?
----- Original Message ----
> From: Roland Smith <rsmith at xs4all.nl>
> To: James <jamesh at lanl.gov>
> Cc: Sean Murphy <smurphy at calarts.edu>; freebsd-questions at freebsd.org
> Sent: Monday, November 5, 2007 4:58:47 PM
> Subject: Re: Help Failing Disk Problem
> On Mon, Nov 05, 2007 at 03:16:46PM +0000, James wrote:
> > > rsync is too high-level, and may not do exactly the right
> > > links or sparse files or who knows what.
> > rsync -cav takes cares of symlinks and all that just right. It's a
> > beautiful thing.
> > Checksumming, too. Ah, bliss.
> It doesn't necessarily do the right thing with flags, acls and other
> extended attributes,
> > > dd is too low-level--you get
> > > the same partition table/bsdlabel and the exact
> > > sizes. That's okay on an identical hard drive, but a pain on
> > > larger.
> > > dump, on the other hand, is just right.
> > If the file names on the drive change during the dump, corruption can
> > occur. At least on linux. I remember Torvalds ranting about it on a
> > mailing list. I imagine FreeBSD suffers the same issue, though,
> > a pretty generic problem.
> For starters, you should _never_ dump a live filesystem. What you
> dump a snapshot of a live filesystem, using dumps '-L' option,
> snapshot is like a frozen image of the filesystem; it doesn't change.
> Dump & restore is the best way to move data and all attributes to a
> larger disk. See §9.2 of the FAQ.
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