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 :: Mailing Lists

[ILUG] Disk write speed

[ILUG] Disk write speed

Niall O Broin niall at linux.ie
Mon Dec 5 12:44:07 GMT 2005


On 5 Dec 2005, at 11:32, Pádraig Brady wrote:

>> Of course it is. Datasheets will always quote the absolute best case
>> downhill with a following wind speed. Hence the question here as to
>> what people were achieving in the real world. Which question, sadly,
>> has not yet been answered (well, except by Paul on some old hardware -
>> not very interesting).
>
> Well testing sustained (packet dumps) to disk in corvil got
> around 50MB/s for newer disks no matter if they were SCSI or IDE.

OK - that's an interesting real world number.

> So multiply this number up depending on your RAID setup.

Not forgetting to add appropriate fudge factor :-)

> There are so many variables really that you just need to
> test what's available to you. Here are some numbers for
> reference at the high end:
> http://lkml.org/lkml/2005/11/11/291

That post is from Merkey. For reliable information, I'd pick the 
Brothers Grimm first.



Niall




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