Take the 2-minute tour ×
Server Fault is a question and answer site for professional system and network administrators. It's 100% free, no registration required.

I have read in various places (e.g. here and here) that NFS' I/O performance does not scale, while Lustre's does, and that Lustre can deliver better I/O rates in general.

There seem to be various architectural differences between the two, but I can't identify what exactly gives Lustre the bump in speed or scalability. I guess my question is somewhat conceptual, but what is the key difference with respect to NFS, or feature, that allows Lustre to scale and deliver faster I/O rates?

share|improve this question

1 Answer 1

up vote 4 down vote accepted

NFS is from 1 client to 1 server, so the overall performance is limited by the performance of that 1 server. Adding more servers does not help.

Lustre splits the data, the data gets requested from 1 server, but can be sent from one or more other servers. So adding more servers does help (which is why "Lustre scales"). This is an important bit from your first link:

Lustre IO performance does scale. It uses a 3rd-party transfer. Requests are made to the metadata server and IO moves directly between the affected storage component(s) and the client.

share|improve this answer

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.