linux-kernel - Re: Solaris ZFS on Linux

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Message-ID: <m3ejvzqkjf.fsf@defiant.localdomain>
Date:	Wed, 02 Aug 2006 16:28:20 +0200
From:	Krzysztof Halasa <khc@...waw.pl>
To:	Kyle Moffett <mrmacman_g4@....com>
Cc:	Ian Stirling <ian.stirling@...ve.plus.com>,
	David Masover <ninja@...phack.com>,
	David Lang <dlang@...italinsight.com>,
	Nate Diller <nate.diller@...il.com>,
	Adrian Ulrich <reiser4@...nkenlights.ch>,
	"Horst H. von Brand" <vonbrand@....utfsm.cl>, ipso@...ppymail.ca,
	lkml@...productions.com, Jeff Garzik <jeff@...zik.org>,
	"Theodore Ts'o" <tytso@....edu>,
	LKML Kernel <linux-kernel@...r.kernel.org>,
	reiserfs-list@...esys.com
Subject: Re: Solaris ZFS on Linux

Kyle Moffett <mrmacman_g4@....com> writes:

> IMHO the best alternative for a situation like that is a storage
> controller with a battery-backed cache and a hunk of flash NVRAM for
> when the power shuts off (just in case you run out of battery), as
> well as a separate 1GB battery-backed PCI ramdisk for an external
> journal device (likewise equipped with flash NVRAM).  It doesn't take
> much power at all to write a gig of stuff to a small flash chip
> (Think about your digital camera which runs off a couple AA's), so
> with a fair-sized on-board battery pack you could easily transfer its
> data to NVRAM and still have power left to back up data in RAM for 12
> hours or so.  That way bootup is fast (no reading 1GB of data from
> NVRAM) but there's no risk of data loss.

Not sure - reading flash is fast, but writing is quite slow.
A digital camera can consume a set of 2 or 4 2500 mAh AA cells
for a fraction of 1 GB (of course, only a part of power goes
to flash).
-- 
Krzysztof Halasa
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