Prepare a quote for the cassandra servers

According the results of the benchmarks, prepare a quote for the 5 cassandra nodes

[DRAFT] 5 servers

• 64Go of memory
• with 1 or 2 ssds
• X x SAS 10k disks for the data
• BOSS drives for boot
• xxx

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Migrated from T3464 (view on Phabricator)