[lustre-discuss] question about /proc/fs/lustre/osc/ and llapi functions.

[John Bauer]

In /proc/fs/lustre/osc/ is an entry for every osc of all the lustre 
files systems on a client node of the form 
*nbp9-OST0124-osc-ffff880ffaa4bc00

*My I/O instrumentation library tracks OSC's associated with an 
application file by reading the files in the directory for each OSC the 
application file is striped on.
I am trying to avoid the use of opendir() and readdir() to find the OSC 
entry of interest as there are 1284 entries in the lustre/osc directory, 
and I do this for hundreds of application files on hundreds of ranks.
I would like to generated the names of the osc entries I need, on the 
fly, given the discoverable file system name and osc indices.

I can find the file system name, *nbp9*, with llapi_getname().  I can 
generate the *OSTxxxx* part with the osc index from llapi_get_stripe().
My question is, where do I find the *ffff880ffaa4bc00 *that is part of 
the directory entry for each OSC?  The value would appear to be file system
related, as each OSC associated with a given file system has the same 
value.  OSC's of a different file system have a different value.
Is there an llapi_xxxx() call that will get me this value.

Thanks

John


-- 
I/O Doctors, LLC
507-766-0378
bauerj at iodoctors.com

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.lustre.org/pipermail/lustre-discuss-lustre.org/attachments/20170407/22772352/attachment.htm>