Re: almost too ashamed to ask; drive read-ahead & rz1000
Marcin Dalecki (dalecki@dacotec.net)
Thu, 30 Dec 1999 17:07:56 +0100
Folkert van Heusden wrote:
>
> Question; is de read-ahead of the rz1000 chipset (on p90 plato
> mobo's) the same as the read-ahead you can swith on with hdparm
> -A1? Or is the last one for the harddisk itself? (-> that it is
> reading ahead in its own internal buffers or something)
> If it's not for the harddisk, but specifically for the chipset;
> I might have solved the fs corruption I saw with 2.2.12 on my
> P90 :-)
Genreally there two kind's of read ahead in linux:
1. On the file system level the kernel is maintaining a readahead himself.
2. And yes there is a readahead on the controller level, which is
basically describing how many sectors the HD's controller will read
in advance into his own cache.
--Marcin
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