linux-kernel - Re: [ANNOUNCE] Ramback: faster than a speeding bullet

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Message-ID: <47D9856E.9010304@davidnewall.com>
Date:	Fri, 14 Mar 2008 06:20:06 +1030
From:	David Newall <davidn@...idnewall.com>
To:	Daniel Phillips <phillips@...nq.net>
CC:	david@...g.hm, Chris Friesen <cfriesen@...tel.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	linux-kernel@...r.kernel.org
Subject: Re: [ANNOUNCE] Ramback: faster than a speeding bullet

Daniel Phillips wrote:
> The period where you cannot access the data is downtime.  If your script
> just does a cp from a disk array to the ram device you cannot just read
> from the backing store in that period because you will need to fail over
> to the ramdisk at some point, and you cannot just read from the ramdisk
> because it is not populated yet.

Wouldn't a raid-1 set comprising disk + ramdisk do that with no downtime?
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