5:48 a.m.
On 2013/21/03 4:09 AM, "Michael Kluge" <Michael.Kluge(a)tu-dresden.de>
wrote:
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
8:07 a.m.
New subject: [Lustre-discuss] will obdfilter-survey destroy an already formatted file system
Michael,
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.
Thanks,
-Cory
On 3/21/13 7:18 PM, "Dilger, Andreas" <andreas.dilger(a)intel.com> wrote:
On 2013/21/03 4:09 AM, "Michael Kluge"
<Michael.Kluge(a)tu-dresden.de>
wrote:
>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
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