Node 1Node 2Node 3Node 4Node 5 DB 1Copy 1 DB 2Copy 1 DB 3Copy 1 DB 4Copy 1 DB 5Copy 1 DB 6Copy 1 DB 7Copy 1 DB 8Copy 1 DB 9Copy 1 DB 10Copy 1 Node 1Node 2Node 3Node 4Node 5 DB 1Copy 1 DB 2Copy 1 DB 3Copy 1 DB 4Copy 1 DB 5Copy 1

Node 1Node 2Node 3Node 4Node 5 DB 1Copy 1Copy 2 DB 2Copy 1Copy 2 DB 3Copy 1Copy 2 DB 4Copy 1Copy 2 DB 5Copy 2Copy 1 DB 6Copy 1 DB 7Copy 1 DB 8Copy 1 DB 9Copy 1 DB 10Copy 1 DB 11Copy 1 DB 12Copy 1 DB 13Copy 1 DB 14Copy 1 DB 15Copy 1 DB 16Copy 1 DB 17Copy 1 DB 18Copy 1 DB 19Copy 1 DB 20Copy 1 Node 1Node 2Node 3Node 4Node 5 DB 1Copy 1Copy 2 DB 2Copy 1Copy 2 DB 3Copy 1Copy 2 DB 4Copy 1Copy 2 DB 5Copy 2Copy 1 DB 6Copy 1Copy 2 DB 7Copy 1Copy 2 DB 8Copy 1Copy 2 DB 9Copy 2Copy 1 DB 10Copy 2Copy 1 DB 11Copy 1 DB 12Copy 1 DB 13Copy 1 DB 14Copy 1 DB 15Copy 1 DB 16Copy 1 DB 17Copy 1 DB 18Copy 1 DB 19Copy 1 DB 20Copy 1 Node 1Node 2Node 3Node 4Node 5 DB 1Copy 1Copy 2 DB 2Copy 1Copy 2 DB 3Copy 1Copy 2 DB 4Copy 1Copy 2 DB 5Copy 2Copy 1 DB 6Copy 1Copy 2 DB 7Copy 1Copy 2 DB 8Copy 1Copy 2 DB 9Copy 2Copy 1 DB 10Copy 2Copy 1 DB 11Copy 1Copy 2 DB 12Copy 1Copy 2 DB 13Copy 2Copy 1 DB 14Copy 2Copy 1 DB 15Copy 2Copy 1 DB 16Copy 1 DB 17Copy 1 DB 18Copy 1 DB 19Copy 1 DB 20Copy 1 Node 1Node 2Node 3Node 4Node 5 DB 1Copy 1Copy 2 DB 2Copy 1Copy 2 DB 3Copy 1Copy 2 DB 4Copy 1Copy 2 DB 5Copy 2Copy 1 DB 6Copy 1Copy 2 DB 7Copy 1Copy 2 DB 8Copy 1Copy 2 DB 9Copy 2Copy 1 DB 10Copy 2Copy 1 DB 11Copy 1Copy 2 DB 12Copy 1Copy 2 DB 13Copy 2Copy 1 DB 14Copy 2Copy 1 DB 15Copy 2Copy 1 DB 16Copy 1Copy 2 DB 17Copy 2Copy 1 DB 18Copy 2Copy 1 DB 19Copy 2Copy 1 DB 20Copy 2Copy 1 Node 1Node 2Node 3Node 4Node 5 DB 1Copy 1Copy 2 DB 2Copy 1Copy 2 DB 3Copy 1Copy 2 DB 4Copy 1Copy 2 DB 5Copy 2Copy 1 DB 6Copy 1Copy 2 DB 7Copy 1Copy 2 DB 8Copy 1Copy 2 DB 9Copy 2Copy 1 DB 10Copy 2Copy 1 DB 11Copy 1Copy 2 DB 12Copy 1Copy 2 DB 13Copy 2Copy 1 DB 14Copy 2Copy 1 DB 15Copy 2Copy 1 DB 16Copy 1Copy 2 DB 17Copy 2Copy 1 DB 18Copy 2Copy 1 DB 19Copy 2Copy 1 DB 20Copy 2Copy 1

Node 1Node 2Node 3Node 4Node 5 DB 1Copy 1Copy 2Copy 3 DB 2Copy 1Copy 2Copy 3 DB 3Copy 1Copy 2Copy 3 DB 4Copy 3Copy 1Copy 2 DB 5Copy 2Copy 3Copy 1 Node 1Node 2Node 3Node 4Node 5 DB 41Copy 1Copy 2Copy 3 DB 42Copy 3Copy 1Copy 2 DB 43Copy 3Copy 1Copy 2 DB 44Copy 3Copy 1Copy 2 DB 45Copy 2Copy 3Copy 1 Node 1Node 2Node 3Node 4Node 5 DB 21Copy 1Copy 2Copy 3 DB 22Copy 1Copy 2Copy 3 DB 23Copy 3Copy 1Copy 2 DB 24Copy 3Copy 1Copy 2 DB 25Copy 2Copy 3Copy 1 Node 1Node 2Node 3Node 4Node 5 DB 1Copy 1Copy 2Copy 3 DB 2Copy 1Copy 2Copy 3 DB 3Copy 1Copy 2Copy 3 DB 4Copy 3Copy 1Copy 2 DB 5Copy 2Copy 3Copy 1 DB 6Copy 1Copy 2 DB 7Copy 1Copy 2 DB 8Copy 1Copy 2 DB 9Copy 2Copy 1 DB 10Copy 2Copy 1 DB 11Copy 1Copy 2 DB 12Copy 1Copy 2 DB 13Copy 2Copy 1 DB 14Copy 2Copy 1 DB 15Copy 2Copy 1 DB 16Copy 1Copy 2 DB 17Copy 2Copy 1 DB 18Copy 2Copy 1 DB 19Copy 2Copy 1 DB 20Copy 2Copy 1 Node 1Node 2Node 3Node 4Node 5 DB 1Copy 1Copy 2Copy 3 DB 2Copy 1Copy 2Copy 3 DB 3Copy 1Copy 2Copy 3 DB 4Copy 3Copy 1Copy 2 DB 5Copy 2Copy 3Copy 1 DB 6Copy 1Copy 2Copy 3 DB 7Copy 1Copy 2Copy 3 DB 8Copy 3Copy 1Copy 2 DB 9Copy 2Copy 3Copy 1 DB 10Copy 2Copy 3Copy 1 DB 11Copy 1Copy 2 DB 12Copy 1Copy 2 DB 13Copy 2Copy 1 DB 14Copy 2Copy 1 DB 15Copy 2Copy 1 DB 16Copy 1Copy 2 DB 17Copy 2Copy 1 DB 18Copy 2Copy 1 DB 19Copy 2Copy 1 DB 20Copy 2Copy 1 Node 1Node 2Node 3Node 4Node 5 DB 1Copy 1Copy 2Copy 3 DB 2Copy 1Copy 2Copy 3 DB 3Copy 1Copy 2Copy 3 DB 4Copy 3Copy 1Copy 2 DB 5Copy 2Copy 3Copy 1 DB 6Copy 1Copy 2Copy 3 DB 7Copy 1Copy 2Copy 3 DB 8Copy 3Copy 1Copy 2 DB 9Copy 2Copy 3Copy 1 DB 10Copy 2Copy 3Copy 1 DB 11Copy 1Copy 2Copy 3 DB 12Copy 3Copy 1Copy 2 DB 13Copy 2Copy 3Copy 1 DB 14Copy 2Copy 3Copy 1 DB 15Copy 2Copy 3Copy 1 DB 16Copy 1Copy 2 DB 17Copy 2Copy 1 DB 18Copy 2Copy 1 DB 19Copy 2Copy 1 DB 20Copy 2Copy 1 Node 1Node 2Node 3Node 4Node 5 DB 1Copy 1Copy 2Copy 3 DB 2Copy 1Copy 2Copy 3 DB 3Copy 1Copy 2Copy 3 DB 4Copy 3Copy 1Copy 2 DB 5Copy 2Copy 3Copy 1 DB 6Copy 1Copy 2Copy 3 DB 7Copy 1Copy 2Copy 3 DB 8Copy 3Copy 1Copy 2 DB 9Copy 2Copy 3Copy 1 DB 10Copy 2Copy 3Copy 1 DB 11Copy 1Copy 2Copy 3 DB 12Copy 3Copy 1Copy 2 DB 13Copy 2Copy 3Copy 1 DB 14Copy 2Copy 3Copy 1 DB 15Copy 2Copy 3Copy 1 DB 16Copy 1Copy 3Copy 2 DB 17Copy 2Copy 1Copy 3 DB 18Copy 2Copy 1Copy 3 DB 19Copy 2Copy 1Copy 3 DB 20Copy 3Copy 2Copy 1

Failure Scenarios Server 1Server 2Server 3Server 4Server 5Total Active DBs DB Outages No Failures12 60None Single FailureX15 60None Double FailureXX20 60None Triple Failure*XXX27 546

Normal operating conditions – each server hosts 3 active and 3 passive copies Building block is 4x3=12 We have fully symmetric design! Single server failure E.g. server 1 is lost Now each surviving server hosts 4 active and 2 passive copies; All databases are still available Two servers failure Now each surviving server hosts 5 active copies and 1 passive copy; 2 databases are dead because we lost all servers that had their copies

announcement

Node 1Node 2Node 3Node 4Node 5Node 6 DB 1Copy 1 DB 2Copy 1 DB 3Copy 1 DB 4Copy 1 DB 5Copy 1 DB 6Copy 1

Server1Server 2Server 3Server 4Server 5Server 6 DB1 Copy 1 DB2 Copy 1 DB3 Copy 1 DB4 Copy 1 DB5 Copy 1 DB6 Copy 1 DB7 Copy 1 DB8 Copy 1 DB9 Copy 1 DB10 Copy 1 DB11 Copy 1 DB12 Copy 1 DB13 Copy 1 DB14 Copy 1 DB15 Copy 1 DB16 Copy 1 DB17 Copy 1 DB18 Copy 1 DB19 Copy 1 DB20 Copy 1 DB21 Copy 1 DB22 Copy 1 DB23 Copy 1 DB24 Copy 1 Server1Server 2Server 3Server 4Server 5Server 6 DB1 Copy DB Copy 1 DB3 Copy DB Copy 1 DB5 Copy DB Copy 1 DB7 Copy DB Copy 1 DB9 Copy DB Copy 1 DB11 Copy DB Copy 1 DB13 Copy DB Copy 1 DB15 Copy DB Copy 1 DB17 Copy DB Copy 1 DB19 Copy DB Copy 1 DB21 Copy DB Copy 1 DB23 Copy DB Copy 1 Server1Server 2Server 3Server 4Server 5Server 6 DB1 Copy Copy 2 DB Copy 1 Copy 2 DB3 Copy Copy 2 DB Copy 1Copy 2 DB5 Copy 2 Copy DB6 Copy Copy 1 DB7 Copy DB Copy 1 DB9 Copy DB Copy 1 DB11 Copy DB Copy 1 DB13 Copy DB Copy 1 DB15 Copy DB Copy 1 DB17 Copy DB Copy 1 DB19 Copy DB Copy 1 DB21 Copy DB Copy 1 DB23 Copy DB Copy 1 Server1Server 2Server 3Server 4Server 5Server 6 DB1 Copy Copy 2 DB Copy 1 Copy 2 DB3 Copy Copy 2 DB Copy 1Copy 2 DB5 Copy 2 Copy DB6 Copy Copy 1 DB7 Copy Copy 2 DB Copy 1 Copy 2 DB9 Copy Copy 2 DB10 Copy Copy 1 DB11 Copy 2 Copy DB12 Copy Copy 1 DB13 Copy DB Copy 1 DB15 Copy DB Copy 1 DB17 Copy DB Copy 1 DB19 Copy DB Copy 1 DB21 Copy DB Copy 1 DB23 Copy DB Copy 1 Server1Server 2Server 3Server 4Server 5Server 6 DB1 Copy Copy 2 DB Copy 1 Copy 2 DB3 Copy Copy 2 DB Copy 1Copy 2 DB5 Copy 2 Copy DB6 Copy Copy 1 DB7 Copy Copy 2 DB Copy 1 Copy 2 DB9 Copy Copy 2 DB10 Copy Copy 1 DB11 Copy 2 Copy DB12 Copy Copy 1 DB13 Copy Copy 2 DB Copy 1 Copy 2 DB15 Copy 2 Copy DB16 Copy Copy 1 DB17 Copy 2 Copy DB18 Copy Copy 1 DB19Copy DB Copy 1 DB21 Copy DB Copy 1 DB23 Copy DB Copy 1 Server1Server 2Server 3Server 4Server 5Server 6 DB1 Copy Copy 2 DB Copy 1 Copy 2 DB3 Copy Copy 2 DB Copy 1Copy 2 DB5 Copy 2 Copy DB6 Copy Copy 1 DB7 Copy Copy 2 DB Copy 1 Copy 2 DB9 Copy Copy 2 DB10 Copy Copy 1 DB11 Copy 2 Copy DB12 Copy Copy 1 DB13 Copy Copy 2 DB Copy 1 Copy 2 DB15 Copy 2 Copy DB16 Copy Copy 1 DB17 Copy 2 Copy DB18 Copy Copy 1 DB19Copy Copy 2 DB Copy 1Copy 2 DB21 Copy 2Copy DB Copy 1Copy 2 DB23 Copy 2Copy DB24Copy Copy 1

Server1Server 2Server 3Server 4Server 5Server 6 DB1 Copy Copy DB Copy Copy 2 DB3 Copy Copy DB Copy Copy 2 DB5 Copy Copy DB Copy Copy 1 DB7 Copy Copy 2 DB Copy 1 Copy DB9 Copy Copy 2 DB10 Copy Copy 1 DB Copy 2 Copy DB12 Copy Copy 1 … DB25 Copy Copy DB Copy Copy 2 DB27 Copy Copy DB Copy Copy 2 DB29 Copy Copy DB Copy Copy 1 DB31 Copy Copy 2 DB Copy 1 Copy DB33 Copy Copy 2 DB34 Copy Copy 1 DB Copy 2 Copy DB36 Copy Copy 1 … Server1Server 2Server 3Server 4Server 5Server 6 DB1 Copy Copy Copy 3 DB Copy Copy 2 Copy 3 DB3 Copy 3 Copy Copy DB4 Copy Copy Copy 2 DB5 Copy Copy 3 Copy DB Copy 2Copy Copy 1 DB7 Copy Copy 2 DB Copy 1 Copy DB9 Copy Copy 2 DB10 Copy Copy 1 DB Copy 2 Copy DB12 Copy Copy 1 … DB25 Copy Copy DB Copy Copy 2 DB27 Copy Copy DB Copy Copy 2 DB29 Copy Copy DB Copy Copy 1 DB31 Copy Copy 2 DB Copy 1 Copy DB33 Copy Copy 2 DB34 Copy Copy 1 DB Copy 2 Copy DB36 Copy Copy 1 … Server1Server 2Server 3Server 4Server 5Server 6 DB1 Copy Copy Copy 3 DB Copy Copy 2 Copy 3 DB3 Copy 3 Copy Copy DB4 Copy Copy Copy 2 DB5 Copy Copy 3 Copy DB Copy 2Copy Copy 1 DB7 Copy Copy 2 Copy 3 DB Copy 1Copy 3Copy DB9 Copy 3Copy Copy 2 DB10 Copy Copy 1Copy 3 DB Copy 2Copy 3Copy DB12 Copy 3Copy Copy 1 … DB25 Copy Copy DB Copy Copy 2 DB27 Copy Copy DB Copy Copy 2 DB29 Copy Copy DB Copy Copy 1 DB31 Copy Copy 2 DB Copy 1 Copy DB33 Copy Copy 2 DB34 Copy Copy 1 DB Copy 2 Copy DB36 Copy Copy 1 … Server1Server 2Server 3Server 4Server 5Server 6 DB1 Copy Copy Copy 3 DB Copy Copy 2 Copy 3 DB3 Copy 3 Copy Copy DB4 Copy Copy Copy 2 DB5 Copy Copy 3 Copy DB Copy 2Copy Copy 1 DB7 Copy Copy 2 Copy 3 DB Copy 1Copy 3Copy DB9 Copy 3Copy Copy 2 DB10 Copy Copy 1Copy 3 DB Copy 2Copy 3Copy DB12 Copy 3Copy Copy 1 … DB25 Copy Copy Copy 3 DB Copy Copy 2Copy 3 DB27 Copy 3Copy Copy DB28 Copy Copy Copy 2 DB29 Copy Copy 3Copy DB Copy 2Copy Copy 1 DB31 Copy Copy 2 DB Copy 1 Copy DB33 Copy Copy 2 DB34 Copy Copy 1 DB Copy 2 Copy DB36 Copy Copy 1 … Server1Server 2Server 3Server 4Server 5Server 6 DB1 Copy Copy 2 DB Copy 1Copy 2 DB3 Copy Copy 2 DB Copy 1Copy 2 DB5 Copy 2 Copy DB6 Copy Copy 1 DB7 Copy Copy 2 DB Copy 1 Copy 2 DB9 Copy Copy 2 DB10 Copy Copy 1 DB11 Copy 2 Copy DB12 Copy Copy 1 … DB25 Copy Copy 2 DB Copy 1Copy 2 DB27 Copy Copy 2 DB Copy 1Copy 2 DB29 Copy 2 Copy DB30 Copy Copy 1 DB31 Copy Copy 2 DB Copy 1 Copy 2 DB33 Copy Copy 2 DB34 Copy Copy 1 DB35 Copy 2 Copy DB36 Copy Copy 1 … Server1Server 2Server 3Server 4Server 5Server 6 DB1 Copy Copy Copy 3 DB Copy Copy 2 Copy 3 DB3 Copy 3 Copy Copy DB4 Copy Copy Copy 2 DB5 Copy Copy 3 Copy DB Copy 2Copy Copy 1 DB7 Copy Copy 2 Copy 3 DB Copy 1Copy 3Copy DB9 Copy 3Copy Copy 2 DB10 Copy Copy 1Copy 3 DB Copy 2Copy 3Copy DB12 Copy 3Copy Copy 1 … DB25 Copy Copy Copy 3 DB Copy Copy 2Copy 3 DB27 Copy 3Copy Copy DB28 Copy Copy Copy 2 DB29 Copy Copy 3Copy DB Copy 2Copy Copy 1 DB31 Copy Copy 2Copy 3 DB Copy 1 Copy 3Copy DB33 Copy 3Copy Copy 2 DB34 Copy Copy 1 Copy 3 DB Copy 2Copy 3 Copy DB36 Copy 3Copy Copy 1 …

Failure Scenarios Server 1Server 2Server 3Server 4Server 5Server 6Active Databases No Failures Single Failure X Double Failure XX12 48 Double Failure X10X 14 48

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