[Disksim-users] separate write cache

[John Bucy]

Our recent experience has been that the disk cache code in disksim is
pretty opaque and fragile;  we've had instances where, e.g. changing
the parameters to try to disable the writeback cache has uncovered
bugs or otherwise didn't work.  Sorry I can't be more helpful than
that.



john

On 10/12/06, Nuengwong Tuaycharoen <mitzytest at gmail.com> wrote:
> Hi,
> I'm using Disksim 2.0. I am just not sure how to implement a separate write
> cache buffer from a read cache. I want my write cache buffer to (1) have
> multi-segments, (2) piggybacks the write requests when the read/write head
> passes the disk sectors, and (3) sends the write requests to the disk when
> the disk is idle. How can I set the parameter files to implement that? Right
> now I set these parameters:
>
> Number of buffer segments: 1024
> Maximum number of write segments: 512
> Use separate write segment: 1
> Immediate buffer write: 1
>
> The write cache papers claimed that the cache can improve the performance
> significantly. However, the output from my settings seems not to change
> much. Do I need to set anything else?
>
> Thank you.
>
> -- NT
>
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