[lustre-discuss] How are mutilple files distributed across multiple OSTs

Ben Evans bevans at cray.com
Thu Jul 2 06:10:13 PDT 2015

Using the default stripe, they should be parceled out to OSTs on a round-robin basis.

At a certain point, if one OST becomes too full, files will be preferentially sent to other OSTs.

One thing to check is to make sure that the starting OST is set to -1 (which is the default) if you're seeing different behavior.

-Ben Evans

From: lustre-discuss [mailto:lustre-discuss-bounces at lists.lustre.org] On Behalf Of Prakrati.Agrawal at shell.com
Sent: Thursday, July 02, 2015 2:27 AM
To: lustre-discuss at lists.lustre.org
Subject: [lustre-discuss] How are mutilple files distributed across multiple OSTs


I have a basic doubt:
If I have a directory whose stripe size is default and stripe count is set to 1. I have thousand files in that directory.
Total number of OSTs in my Lustre file system is say 8. Then how are those thousand files written to the OSTs?
Is it that first one OST is filled up with as many files as possible and then next OST is targeted or is it like file 1 to OST 1, file 2 to OST 2 and so on and then it comes back from file 13 to OST1.

Please help.

Thanks and Regards,
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