Re: How to fio benchmark on RAID device avoiding any caching

["Beierl, Mark" <Mark.Beierl@xxxxxxxx>]

I don’t know of any method to have a process on the OS issue instructions that would bypass the RAID controller’s cache.

I hate to say it, but the only really effective way of ensuring you are not measuring the cache is to ensure that your test file (or files) are larger (like 4-5 times) than the amount of memory in the RAID controller.

Regards,
Mark
 
Mark Beierl
SW System Sr Principal Developer
Dell EMC | Cloud & Communication Service Provider Solution
Mark.Beierl@xxxxxxxx

On 2018-08-09, 10:14, "fio-owner@xxxxxxxxxxxxxxx on behalf of c.monty@xxxxxx" <fio-owner@xxxxxxxxxxxxxxx on behalf of c.monty@xxxxxx> wrote:

    Hi,
    
    can you recommend a fio setting for benchmarking a RAID device that is bypassing any caching effects in case RAID controller has cache enabled?
    
    THX
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