This page contains a collection of rough estimates of various interesting properties of a RAMCloud system:

• Rate of crashes: every 15 minutes (assumes 10,000 servers, 3 crashes/server/year)
• Time to completely recover a crashed server (assumes 64 GB of memory must be transferred to a new server over the network):
  • 10 minutes @ 1Gb/s
  • 1 minute @ 10Gb/s
• Time to recover hash table for a crashed server (64 GB memory, 8 bytes/object):
  • 100-byte objects => 640M objects => 5GB => 5 secs. @ 10Gb/s, 50 secs @ 1Gb/s
  • 1000-byte objects => 64M objects => 0.5GB => .5 sec @ 10Gb/s, 5 secs @ 1 Gb/s
• Number of segments (assuming 8MB/segment):
  • 8000 segments per server (assumes 64GB memory/server)
  • 80M segments in a RAMCloud (assumes 10,000 servers)