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Placement Groups (Clustered Placement Group (very high throughput, very…
Placement Groups
Clustered Placement Group
very high throughput
very low latency
all instances in one AZ
can not be spread of AZs
all instances on the same hardware rack (group them together)
cons: finite set, upfront provision
Spread Placement Group
business critical instances
not allowed to be on the same hardware
can be spread over multiple AZs
put instances over different racks --> Hardware diversity
Security reasons or Hardware failure risk reduction
max 7 Instances per group per AZ
Partition Placement Group
large distributed/replicated workloads
first partitioned in groups then spread across racks
each partition is on a different hardware rack
grouped in partitions
one partition is on the same rack
lots of instances
not for dedicated hosts
resilience and hardware diversity
cant move an instance to an existing placement group
make AMI than launch new EC2 with that AMOI in existing PG
only special types of EC2 can be in a placement group
AWS recommends homogenous types in one PG
cant merge placement groups