Re: File system compression, not at the block layer

From: Ben Greear
Date: Fri Apr 23 2004 - 16:16:39 EST

Richard B. Johnson wrote:

Actually not. You need a FIFO to cache your bits into buffers of bytes
anyway. Depending upon the length of the FIFO, you can "rubber-band" a
lot of rotational latency. When you are dealing with a lot of drives,
you are never going to have all the write currents turn on at the same
time anyway because they are (very) soft-sectored, i.e., block
replacement, etc.

Wouldn't this pretty much guarantee worst-case latency scenario for reading, since
on average at least one of your 32 disks is going to require a full rotation
(and probably a seek) to find it's bit?


Ben Greear <greearb@xxxxxxxxxxxxxxx>
Candela Technologies Inc

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