linux-kernel - Re: Solaris ZFS on Linux

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Date:	Wed, 02 Aug 2006 19:12:23 +0100
From:	Ian Stirling <ian.stirling@...ve.plus.com>
To:	Krzysztof Halasa <khc@...waw.pl>
CC:	Kyle Moffett <mrmacman_g4@....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

Krzysztof Halasa wrote:
> 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

> 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).

Yeah - that's why I said in the original message that it's not
especially lower in energy - the energy is used at a lower rate,
so is much cheaper to supply.
http://www.samsung.com/products/semiconductor/NORFlash/256Mbit/K8A5615EBA/K8A5615EBA.htm 
's datasheet says to program the 32Mbyte chip takes about 30mw*120s, or 
3.5J or so.
For a gigabyte, that's 100J - a fairly substantial amount of energy.
However - it's at a low rate, so it's not _too_ expensive to supply.
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