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[Fwd: Re: F10+dmraid eats puppies! (and ate my system too)]




-------- Original Message --------
Subject: 	Re: F10+dmraid eats puppies! (and ate my system too)
Date: 	Sat, 13 Dec 2008 22:50:32 -0800
From: 	Graham TerMarsch <fedora howlingfrog com>
Organization: 	Howling Frog Internet Development, Inc.
To: 	fedora-list redhat com
CC: 	Robert L Cochran <cochranb speakeasy net>
References: 	<200812130004 01919 fedora howlingfrog com>
<4943AB2A 5000607 speakeasy net>



On December 13, 2008, Robert L Cochran wrote:
> Could you have used one or more of: dd, ddrescue, and Testdisk to copy
> your system to a set of spare drives and then work only on the spares
> until you had a clear idea of what was wrong? I think that would have
> gone a long way to sparing you from some data loss.

Agreed, there are a multitude of different ways that I could have approached 
this that might have prevented loss of data.  Fortunately, once I figured out 
what had happened I was able to mount both sda and sdb individually and get 
the files off that I needed.  As for copying my system to a set of spare 
drives, its not like I (or likely too many other people here) just have a set 
of spare drives kicking around with a few hundred GB of empty space on them, 
"just in case" of emergency.  Sounds great, but in practice 

What I want to emphasize from my initial post, though, was that its entirely 
possible for someone to get into this funky state and to have data loss and/or 
mirror failure without actually doing anything unusual.

The F10 installed told me that it was installing onto the nvidia dmraid setup 
that I had, and thus I expected that as a result that when it was done that 
I'd actually be running on that dmraid setup (or that it'd at least throw some 
sort of message to indicate that it *wasn't*).  Instead, though, I ended up 
running on bare sda.

IMO, anyone who had a dmraid setup and that has since upgraded to F10 could 
now very likely be just as hosed as I was.  Even if they don't get the 
behaviour of swapping from sda to sdb, they're still running *without* the 
dmraid that they were led to believe that they installed in/on.

-- 
Graham TerMarsch



Generally, if the data is worth saving, then it is worth backing up, too.

If the data is worth saving from a possibly bad disk, image it to a
second known-good hard drive and perform recovery work on the second
drive, never the original. That way you can try again if your first
attempts at recovery don't work.

Hard drives are really cheap to get these days. So it is reasonable to
keep at least one or more external drives that have backups of your
data. Keeping a few known-good "scratch" drives around can really save
the day sometimes. Western Digital makes an entire business out of
supplying MyBook and MyPassport drives for this very purpose. It is also
easy to put an internal drive in an external hard drive enclosure which
uses USB and plug it in. I don't consider this to be expensive at all --
indeed if you shop around you can pick up great hard drives quite cheaply.






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