[DRBD-user] Better performance with meta-data at the beginning of the device?

Cyril Bouthors cyril at bouthors.org
Wed Sep 13 16:43:07 CEST 2006

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.


On 13 Sep 2006, Lars.Ellenberg at linbit.com wrote:

> should not be too much, because we (drbd) go through a lot of
> trouble to minimize access to that area anyways (tunable:
> al-extents).

Good

> and because, if we do, we typically write one sector worth of data,
> so it is not normally the bandwidth, but the latency that is the
> problem. the "inner tracks" won't really decrease latency.

On a typical half empty and non-fragmented filesystem, the data is
stored on the first part of the hard-disk, when DRBD writes its
meta-data at the end of the hard-disk, the head goes through an
average longer distance than if it was at the beginning and hence
average latency goes down.
-- 
Cyril Bouthors
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