Re: Experience with 18G IDE HD

[Nimrod Mesika]

Evgeny Stambulchik wrote:

> As far as performance is considered, it's not RPM that usually matters (inspite
> of a big hype), but the amount of cache on disk. Until recently (1-2 years), the
> maximum cache on IDE disks was 128KB, while about each SCSI disk had 0.5MB.

How come? The OS cache is much bigger (at least several MB). I thought
that a level-2 cache has to be bigger to have any effect? If the block
was not found in the OS cache, how can you expect to find it in the
drive's cache?

mmm.. maybe it's the read ahead and write back buffers that make the
difference? A drive with a large buffer can get much more work done by
itself without involving the OS.. maybe.

-- Nimrod.

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