estimating hard disk read/write I/O rates

[anthrax]

Hi .
I needto estimate thehard disk read:write ratio fordisk I/O for the following types of applications..

ERP
CRM
OLTP
BI

any ideas ?

Thanks

 

[Matthias99]

This might be better for the 'software' forum.

In terms of an actual answer, it depends on what you mean. The read/write ratios of any particular application often depend heavily on how it's being used -- the same database program might be extremely read-heavy in one configuration, and very write-heavy in another. The best way to measure would be to find a system running such I/O and monitor it -- there are hooks in most operating systems that will tell you how many I/Os each drive and/or partition is doing.