Re: fio accessing boot drive

[Vikram Seth <seth.vik@xxxxxxxxx>]

Hi Josh,

Thanks for the response.

Do you mean use 'norandommap' option ?
If I disable random map then won't I lose coverage on random i/o testing?

Vikram.

On Wed, May 4, 2011 at 9:39 PM, Josh Aune <luken@xxxxxxxxx> wrote:
> On Wednesday, May 4, 2011, Vikram Seth <seth.vik@xxxxxxxxx> wrote:
>> Hi,
>>
>> I started using fio recently for raw disk performance testing.
>> I noticed at times that while I am running the attached test file on
>> /dev/sdb, which is a raid 6 volume, there is lot of activity on the
>> boot disk /dev/sda too.
>
> Check for files in /tmp. To not generate them, disable the random map.
>
> Josh
>
>>
>> Here's excerpt from iostat output :
>>
>> Device:         rrqm/s   wrqm/s     r/s     w/s    rMB/s    wMB/s
>> avgrq-sz avgqu-sz   await  svctm  %util
>> sda               0.00  7300.20    0.00   73.60     0.00    27.16
>> 755.76   143.93 1950.19  13.59 100.02
>> sdb               0.00     0.00    0.00  210.00     0.00     0.82
>> 8.00    10.41   49.34   4.76 100.02
>>
>> I'll appreciate any insight into what can be causing these kind of
>> accesses on the boot drive?
>> Can these accesses affect overall performance results on the actual test drive?
>>
>> Thanks,
>> Vikram.
>>
>> PS: I am using fio version 1.50
>>
>
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