[lustre-discuss] Building Best Practices Guide

[Andreas Dilger]

-What does the minimum configuration look like?
Example Minimum MDS/MDT, OSS/OST, what does that look like from a minimum storage capacity perspective?

Few people care about *minimum* limits.  It is possible to format Lustre with a single 32MB MDT and 32MB OST, and mount both and a client on a 2GB VM.  This can be used for functional testing but isn't really useful for much beyond that.

-What is the maximum capacity a Lustre cluster can scale?  (I have done some math and have come to 1EB max storage capacity)

You can find most of the limits in the Lustre Operations Manual:

https://doc.lustre.org/lustre_manual.xhtml#settinguplustresystem.tab2

-What is a reasonable read/write throughput performance for the cluster?
-Same question for R/W IOPs?

and performance ranges in:

https://doc.lustre.org/lustre_manual.xhtml#idm139922676214400

The performance is *very* variable depending on the hardware, so there isn't a reasonable generic answer to that question.

There are performance numbers for specific hardware:

https://blocksandfiles.com/2021/11/10/ddn-doubles-performance-of-high-end-ai-array/

-Does Lustre support snapshots?

On ZFS it does.  On ldiskfs this is under development.

 (I know there is a reference to this and many of my questions on the Wiki page hosted at wiki.lustre.org<http://wiki.lustre.org> but I keep getting an error that it is down)

It looks like the SSL certificate expired.

-What are the protocols supported by Lustre?  I know it supports a POSIX client but how is it supporting NFS and SMB?  It looks like it is sharing the ZFS pool via NFS, but again the wiki is down and can't access it.

Lustre primarily has its own network protocol, but by virtue of exposing POSIX to user space can also be re-exported via NFS and SMB, though at reduced performance compared to native clients.

Cheers, Andreas

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