Re: Solaris ZFS on Linux

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Krzysztof Halasa wrote:

Kyle Moffett <[email protected]> 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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