Forum Discussion
MaxMedov
Cirrostratus
CirrostratusNumber of DCDs
Hello, I saw in a few F5 docs that installing three DCDs instead of one or two is more recommended. I understood the benefit of two DCDs due to the redundancy of replicas, but why is it recommended ...
If you have 3 DCD then the shard mirroring between the DCD will be like 30%. How to explain imagine that DCD 1 goes down then to restore the missing statistics data DCD 2 and DCD 3 will use their own information, so when you have 3 DCD it is not like each one having the exact same copy of the other 2 and it is more opimized.
It is like RAID 1 when you have 2 DCD and RAID 5 when you have 3 DCD:
Nikoolayy1
MVP
MVPIf you have 3 DCD then the shard mirroring between the DCD will be like 30%. How to explain imagine that DCD 1 goes down then to restore the missing statistics data DCD 2 and DCD 3 will use their own information, so when you have 3 DCD it is not like each one having the exact same copy of the other 2 and it is more opimized.
It is like RAID 1 when you have 2 DCD and RAID 5 when you have 3 DCD: