[lustre-discuss] The confusion for mds hardware requirement

[Amin Brick Mover]

In the Lustre Manual 5.5.2.1 section, the examples mentioned:

*For example, for a single MDT on an MDS with 1,024 compute nodes, 12
interactive login nodes, and a*
*20 million file working set (of which 9 million files are cached on the
clients at one time):*
*Operating system overhead = 4096 MB (RHEL8)*
*File system journal = 4096 MB*
*1024 * 32-core clients * 256 files/core * 2KB = 16384 MB*
*12 interactive clients * 100,000 files * 2KB = 2400 MB*
*20 million file working set * 1.5KB/file = 30720 MB*

I'm curious, how were the two numbers, 256 files/core and 100,000 files,
determined? Why?
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