At 4:55 PM +0200 10/26/2010, Mac User #330250 wrote:
> interface <-> cache <-> big flash cache organized as a SSD <-> HD.
So, the performance of the SSD is mainly to make valued files, like
startup files or files which are accessed very often, faster
available through the SSD.
Yea, sortof. The firmware in the device would have to be fairly
clever tho. And realize that at that point, things are chunk or
track oriented, not file.
This will speed up the startup process
A pure SSD boot would be faster, yes. But on a hybrid - I'm thinking
no... The SSD is only supposed to hold data that is accessed (read or
written) *frequently*. Consider that much of the stuff loaded at
boot is read only once!, then kept in RAM forever (wired memory).
Because of that infrequent use, I doubt the caching algorithm would
ever put that data on the SSD. So... the boot process will be a
series of SSD cache misses followed by standard latency/seek/read in
the HD. Those extra misses will slow things down.
and, as the operating system learns (which files are often
requested), the daily work. The wearing level
will be not very high in such a scenario, as the files have to be
updated only now and then, as the software gets updated (security
fixes and such) or as the user changes his/her working behaviour.
Not the OS. The "cache hit" tracking in the device's firmware. It
doesn't know files, just block addresses.
FYI, for about the last two months I am now running my G3 B&W from such a CF
memory card using an CF-to-IDE adapter. It is slower than with the HDD I used
before, but the advantage is that I can leave it running all the time without
fearing the hard drive will break down - the original HDD was 10+ years old.
It is also much lower noise now. And, I couldn't find a new hard drive that
was 40 GB or so, which I needed since I have a Rev.1 G3 B&W with the buggy IDE
controller.
Cool. It will be interesting to see how long the CF card lasts. Be
sure to keep good backups.
- Dan.
--
- Psychoceramic Emeritus; South Jersey, USA, Earth.
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