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I am looking for metrics that affect/reflect user I/O performance. So far I understand OST and MDT metrics are significant. But is there any other metrics which get updated during file write/read operation? Mainly I want to know what is the significance of LOV and LLITE metrics in terms of I/O. (As LOV is related to client, I think it might be significant, but not sure what does it indicate).

Masudul Hasan
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The llite module provides the linkage between the Linux VFS and the underlying storage targets. You could consider this the "POSIX" layer. The LOV module is what aggregates data operations across multiple OSTs into a single virtual object for llite. If a file is striped over multiple OSTs then LOV handles the split/merge of IO requests and sends them to the appropriate OST objects based on the file layout.

LustreOne
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  • thank you very much for the answer. Now, considering I am using multiple threads or say multiple users are trying to create/access files in 1 OST. is it possible to get any idea about this scenario from llite or lov metrics? – Masudul Hasan Mar 30 '19 at 21:14