CTDB - clustered TDB

Clustered Samba systems

Current - add mode nodes - slower

2 nodes should be faster then 1.

15 nodes needed to be faster then 1.

cifs = coherent

Behaviour exactly the same for multinode cluster as for single node system.

No shortcuts (unlike NFSv2 and v3).

Samba database sever:

• mysql backend tdb

databases relatively slow

• filesystem = database

TDB

• very simple
• very fast - 100K/second operations
• byte range locking

Clustered databases too slow

tdb database running over clustered filesystem too slow.

• robustness is high priority.

Robustness not a criteria for Samba databases 0 can look data.

If node lost, only data lost in data associated with node, and clients to node.

• tdb stored in memory.
• No data redundancy

Remote locking is evil, may case cascading locking affect

• don’t hold lock when performing network operation.

• send function/code to node that holds data

encryption slow

LMASTER -> DMASTER

assume same version of Samba on all clusters processors.