SAS 6/iR read write performance

Dominique LALOT dom.lalot at gmail.com
Mon Jun 2 07:41:31 CDT 2008


L.P.H. van Belle a écrit :
> Hi,
>  
> I installed debian etch on a R300 with the ch from kmuto.
> BUT 
>  
> hdparm test ( hdparm -tT /dev/sda )
> resultes in 1700MB/s cached
> buffert 4 MB/s !!!!
>  
> If i put load on the storage i get errors, when i give lots of load
> the server stops working, aka my file system goes to read only.
>  
> These bugs are related to old drivers and new firmware.
> info found on www.kernel.org <http://www.kernel.org>, search for mptsas.
>  
> fixes are found in 2.6.26-rc4-git
>  
> I haved tried these yet, but these bugs look like mine.
>  
> my advies :
>  
> DONT USE SAS6i/R ( or SAS6i/R ) , and buy a PERC 5/6
I won't say that. It depends on the kernel. The hardware seems OK.

I compiled a lot of kernels and finally (for my problem), it appears 
that it comes from a change in 2.6.22 (1-19)
The last 2.6.21 is safe. Lets have a try on it.

Dom
>  
> I spend about 10 hours trying to get this to work, so i think its cheaper
> to buy a PERC 6. these work out of the box.
>  
> Louis
>  
>  
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