Re: Limit LBA Range

[Jens Axboe <axboe@kernel.dk>]

On 2014-09-30 03:17, Andrey Kuzmin wrote:
> On Tue, Sep 30, 2014 at 1:14 PM, Jon Tango <cheerios123@outlook.com> wrote:
>>
>> The same thing could be done by partitioning the SSD in the operating system with the desired partition size, and then running a time-based fio job against the partition.
>>
>> Basically, fio options offset/size should yield the same net result, but I'm always unsure on what is the actual effect of mixing size and time_based in a single job, and whether fio will wrap around the specified size to the specified offset if the job is time-based. HOWTO could have used some clarification on size/time_based interaction.
>>
>> Regards,
>> Andrey
>>
>> On Sep 30, 2014 11:41 AM, "Sitsofe Wheeler" <sitsofe@gmail.com> wrote:
>>>
>>> On 30 September 2014 07:34, Jon Tango <cheerios123@outlook.com> wrote:
>>>>
>>>> The taskfile is this:
>>>
>>> I should have been more specific - you need to show both the _vdbench_
>>> parameter file that you are comparing to in addition to showing your
>>> fio job file.
>>>
>>> --
>>> Sitsofe |http://sucs.org/~sits/
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>> I'm really wanting to avoid the filesystem, they create so much interference. I am focusing on just testing the raw device :)
>
> I'm not sure why a filesystem should be involved in partitioning, that
> happens at the raw device level.

I think there's some limitation in Windows that doesn't allow partition 
raw IO. I may be mistaken.

But I agree, partition would work. But just limiting the LBA range with 
size= will do the same job.

-- 
Jens Axboe