Messages in this thread | | | Date | Tue, 29 Aug 2000 17:03:36 -0700 (PDT) | From | dean gaudet <> | Subject | Re: [PATCH] Fix disk statistic reporting to include all disks |
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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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