RAID-10 on PE2850

[Peter Zaitsev]

On Fri, 2006-05-05 at 09:05 -0700, Jamie Heilman wrote:
> Karl Peña wrote:
> > 
> > Here is that link to the dell specs that shows a PowerEdge 2850's PERC 4/DC
> > does not do RAID10, instead it does RAID1-concatenated, like James said:
> > 
> > http://support.dell.com/support/edocs/software/smarrman/marb34/en/ch8_perc.htm?c=us&l=en&cs=04&s=bsd#46459
> 
> Interestingly enough this claim is not present in the 3.7
> documentation.
> http://support.dell.com/support/edocs/software/smarrman/marb37/EN/controll.htm#229410
> 

I guess this is no more true.  I did some MySQL benchmarks with RAID10
and it was much better than RAID1, while database size was small to fit
on pair of drives so if it would be simply concatenation I should have
gotten similar numbers. 

If you would like to see benchmarks they are in "MySQL Performance
Landscape" presentation listed here:

http://www.mysqlperformanceblog.com/mysql-performance-presentations/

I also tested different raid levels block sizes, filesystems etc. 


-- 
Peter Zaitsev, Senior Performance Engineer
MySQL AB, www.mysql.com