linux-kernel - Re: linear raid, is partial recovery possible?

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Message-ID: <BLU0-SMTP36987CC5BAE13BD585AA31198B20@phx.gbl>
Date:	Mon, 28 Nov 2011 20:05:15 +0000
From:	wilsonjonathan <piercing_male@...mail.com>
To:	linux-kernel@...r.kernel.org
Subject: Re: linear raid, is partial recovery possible?

Please ignore as sent to wrong list.

On Mon, 2011-11-28 at 18:53 +0000, wilsonjonathan wrote:
> Quick question regarding linear raid.
> 
> If a disk fails on a linear raid I understand how the raid is
> non-recoverable, as a whole, as it has lost a chunk of data.
> 
> However is it possible to recover the data from the non-failed portion
> of the raid as I assume linear works by starting at one end of the array
> and slowly progresses to the other?
> 
> Or perhaps it is dependent on the file system on the array, eg. ext
> works by trying to place files distant to each other to help reduce the
> possibility of fragmentation?
> 
> Perhaps the filesystem meta data, or some portion, may span between two
> physical drives which would corrupt its table?
> 
> And obviously if a file spans two disks it would be missing part of its
> data?
> 
> Does the raid underlying a file system do its own things, re-space,
> physical data layout, etc; or does/can a file system impact on the
> workings of an array?
> 
> The more I look into software raid the more fasinated I become with it
> and its inner workings. While its way beyond me in some of the maths and
> the fact I am un-proficient in C it has really caught my intrigue, and
> all because I wanted to set up a small home server ;-)
> 


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