Oh, now I've to cry :-)
not because it's not SSDs... it's SAS2 HDDs

Because, I need to build something for 140 clients... 4200 OSDs

:-(

Looks like, I can pickup my performance by SSDs, but I need a huge capacity ~ 
2PB 
Perhaps, tiering cache pool can save my money, but I've read here - that it's 
slower than all people think...

:-(

Why Lustre is more performable? There're same HDDs?

 
 
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