[lustre-discuss] OST partition sizes

[Alexander I Kulyavtsev]

What range of record sizes did you use for IOR? This is more important than file size.
100MB is small, overall data size (# of files) shall be twice as memory.
I ran series of test for small record size for raidz2 10+2; will re-run some tests after upgrading to 0.6.4.1 .

Single file performance differs substantially from file per process.

Alex.

On Apr 29, 2015, at 9:38 AM, Scott Nolin <scott.nolin at ssec.wisc.edu<mailto:scott.nolin at ssec.wisc.edu>> wrote:

I used IOR, singlefile, 100MB files. That's the most important workload for us. I tried several different file sizes, but 100MB seemed a reasonable compromise for what I see the most. We rarely or never do file striping.

I remember I did see a difference between 10+2 and 8+2. Especially at smaller numbers of clients and threads, the 8+2 performance numbers were more consistent, made a smoother curve. 10+2 with not a lot of threads the performance was more variable.

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