On Tue, 29 Aug 2000, Linus Torvalds wrote:
> On Wed, 30 Aug 2000, Jens Axboe wrote:
>
> > On Wed, Aug 30 2000, Jens Axboe wrote:
> > > Sounds sane, but what about drivers that don't really use the request
> > > queue structure? Stuff like lvm, md, rd (with Neil's patch to fix the
> > > lru_list deadlock), and probably new loop.
> >
> > Of course lvm and md get statistics accounted for the low devices...
>
> No, I think you actually want to double-count here: I think it is sensible
> to have both a low-level statistics _and_ a "md" statistic. It could be
> useful for showing clearly how the requests are distributed.
double-counting is good.
with the veritas tools you can pull up the stats on a fs, volume, or disk
basis. at each level you can get number of r/w, number of blocks r/w, and
avg. latencies. extremely useful for finding hotspots and moving them
elsewhere.
-dean
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