[Lustre-discuss] [HPDD-discuss] will obdfilter-survey destroy an already formatted file system

Cory Spitz spitzcor at cray.com
Tue May 21 19:37:21 PDT 2013


Unfortunately, the current Lustre Ops Manual indicates the opposite.  From
section 24.3 "Testing OST Performance (obdfilter_survey)":

"The obdfilter_survey script is destructive and should not be run on
devices that containing existing data that needs to be preserved. Thus,
tests using obdfilter_survey should be run before the Lustre file system
is placed in production."

I opened LUDOC-146 to track the issue previously and updated the details
to include Andreas' explanation.


On 3/21/13 7:18 PM, "Dilger, Andreas" <andreas.dilger at intel.com> wrote:

>On 2013/21/03 4:09 AM, "Michael Kluge" <Michael.Kluge at tu-dresden.de>
>>I have read through the documentation for obdfilter-survey but could not
>>found any information on how invasive the test is. Will it destroy an
>>already formatted OST or render user data unusable?
>It shouldn't - the obdfilter-survey uses a different object sequence (2)
>compared to normal filesystem objects (currently always 0), so the two do
>not collide.
>Cheers, Andreas
>Andreas Dilger
>Lustre Software Architect
>Intel High Performance Data Division
>HPDD-discuss mailing list
>HPDD-discuss at lists.01.org

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