Significance of LOV and LLITE metrics in Lustre

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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).

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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.