>>>>> "ma" == Matthias Appel <matthias.ap...@lanlabor.com> writes:
ma> At the moment I'm considering using a Gigabyte iRAM as ZIL
acard ans-9010 backs up to CF on power loss. also has a sneaky ``ECC
emulation'' mode that rearranges non-ECC memory into blocks and then
dedicates some bits to ECC, so you don't have to pay unfair prices for
the 9th bit out of every eight. See the ``quick install'' pdf on
acard's site which is written as a FAQ.
it is a little goofy because it goes into this sort of ``crisis mode''
when you yank the power, where it starts using the battery and writing
to the CF, which it doesn't do under normal operation. This exposes
it to UPS-like silly problems if the battery is bad, or the CF is bad,
or the CF isn't shoved in all the way, whatever, while something like
stec that uses the dram and commits to flash continuously can report
its failure before you have to count on it, which is particularly
well-adapted to something like a slog that's not evenv used unless
there's a power failure. but...the acard thing gives stec performance
for intel prices! let us know how your .tw ramdisk scheme goes.
ma> (speed up sync. IO especially for NFS)?
IIUC it will never give you more improvement than disabling the ZIL,
so you should try disabling the ZIL and running tests to get an upper
bound on the improvement you can expect.
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