Re: Helping to model this workload

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On 07/25/2013 01:07 PM, Neto, Antonio Jose Rodrigues wrote:
> 
> On 7/25/13 3:03 PM, "Jens Axboe" <axboe@xxxxxxxxx> wrote:
> 
>> On 07/25/2013 01:02 PM, Neto, Antonio Jose Rodrigues wrote:
>>> Just to confirm..
>>>
>>> bs_is_seq_rand=1
>>>
>>> bs=64k,4k 
>>>
>>> It's 64K for sequential and 4K for random
>>>
>>> Right?
>>
>> Correct. If bs_is_seq_rand is set, any READ block size setting is
>> applied to sequential IO, and any WRITE block size setting is applied to
>> random IO.
>>
>> -- 
>> Jens Axboe
>>
> 
> Let me see if I understood:
> 
> But Jens, if I want sequential read AND write 64KB and random read AND
> write 4KB?

Then you'd do:

bs=64k,4k
bs_is_seq_rand=1

any ANY sequential IO will be 64kb, and ANY random IO will be 4kb.

-- 
Jens Axboe

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