7:26 a.m.
Hi,
If I have known a piece of data resides in a given OSS/OST. Is it possible to access it
directly with using lustre client ?
To be specific, the problem is when I am on an OSS/OST, I want to access the local data of
this OSS/OST without referring to lustre client.
Is it possible, how can I achieve that ?
Thanks in advance.
Yizheng
7:55 a.m.
A method for doing this with an ldiskfs backend is covered in the Lustre
manual:
http://build.whamcloud.com/job/lustre-manual/lastSuccessfulBuild/artifact...
This method is suitable for debugging or exceptional situations, but not
for routine access.
In short:
1. Use lfs getstripe to obtain the obd index and object number.
2. Use debugfs to access the data on disk (e.g. stat, dump).
Ned
On Tue, Oct 08, 2013 at 04:26:50AM +0800, jyizheng wrote:
Hi,
If I have known a piece of data resides in a given OSS/OST. Is it possible to
access it directly with using lustre client ?
To be specific, the problem is when I am on an OSS/OST, I want to access the
local data of this OSS/OST without referring to lustre client.
Is it possible, how can I achieve that ?
Thanks in advance.
Yizheng
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3:46 p.m.
On 2013/10/07 2:26 PM, "jyizheng" <jyizheng(a)gmail.com> wrote:
If I have known a piece of data resides in a given OSS/OST. Is it
possible to access it directly with using lustre client ?
To be specific, the problem is when I am on an OSS/OST, I want to access
the local data of this OSS/OST without referring to lustre client.
Is it possible, how can I achieve that?
The easiest way to do this is just to mount the client on the OSS node.
Any "direct" access is only available for debugging and diagnostic
purposes.
Cheers, Andreas
--
Andreas Dilger
Lustre Software Architect
Intel High Performance Data Division
3267
days inactive
3268
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2 comments
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Dilger, Andreas -
jyizheng -
Ned Bass