http://docs.pivotal.io/pivotalcf/1-12/customizing/small-footprint.html
There was also a Pivotal blog post on this as follows:
https://content.pivotal.io/blog/big-things-come-in-small-packages-getting-started-with-pivotal-cloud-foundry-small-footprint
As you can see from this image it's considerably smaller control plane that's obvious.
It is important to understand what the limitations of such an install are as per the docs link below.
http://docs.pivotal.io/pivotalcf/1-12/customizing/small-footprint.html#limits
Installing the small footprint looks identical from the Operations Manager UI in fact it's still labelled ERT and from the home page of Operations Manager UI your wouldn't even know you had the small footprint
If you dig a bit further and click on the "ERT tile" and then select "Resource Config" left hand link you will then clearly know it's the Small Footprint PCF install.
I choose to use internal MySQL database and if I didn't then it could be scaled back even more then the default 7 VM's I ended up with.
Lastly I was very curious to find out what jobs are placed on which service VM's. Here is what it looked like for me when I logged into bosh director and run some bosh CLI commands
ubuntu@ip-10-0-0-241:~$ bosh2 -e aws vms --column=Instance --column="Process State" --column=AZ --column="VM Type" Using environment '10.0.16.5' as user 'director' (bosh.*.read, openid, bosh.*.admin, bosh.read, bosh.admin) Task 73. Done Deployment 'cf-a96683b17697c86b8c90' Instance Process State AZ VM Type backup-prepare/16356c40-1f20-42f0-8f2e-de45549be797 running ap-southeast-2a t2.micro blobstore/b6e22107-018b-425d-8fe4-ab47eeaf2c75 running ap-southeast-2a m4.large compute/5439f18f-c842-40a2-b6f3-faf6b6848716 running ap-southeast-2a r4.xlarge control/68979d93-d12b-4d87-b110-d3d41a48b261 running ap-southeast-2a r4.xlarge database/a3efedaa-4df6-48f5-9f20-61cf3d9f3c1b running ap-southeast-2a r4.large mysql_monitor/d40ef638-d2d0-488e-b937-99a7f5b5b334 running ap-southeast-2a t2.micro router/f9573547-c5a1-43d4-be02-38a1d9e9c73e running ap-southeast-2a t2.micro 7 vms Succeeded
ubuntu@ip-10-0-0-241:~$ bosh2 -e aws instances --ps --column=Instance --column=Process Using environment '10.0.16.5' as user 'director' (bosh.*.read, openid, bosh.*.admin, bosh.read, bosh.admin) Task 68. Done Deployment 'cf-a96683b17697c86b8c90' Instance Process autoscaling-register-broker/9feaef45-994e-472c-8ca3-f0c39467dd6b - autoscaling/184df31d-a64c-49e0-8b6b-27eafdb31ca0 - backup-prepare/16356c40-1f20-42f0-8f2e-de45549be797 - ~ service-backup blobstore/b6e22107-018b-425d-8fe4-ab47eeaf2c75 - ~ blobstore_nginx ~ blobstore_url_signer ~ consul_agent ~ metron_agent ~ route_registrar bootstrap/0dc22a1f-a1ee-4a03-85c6-fed08f37c44a - compute/5439f18f-c842-40a2-b6f3-faf6b6848716 - ~ consul_agent ~ garden ~ iptables-logger ~ metron_agent ~ netmon ~ nfsv3driver ~ rep ~ route_emitter ~ silk-daemon ~ vxlan-policy-agent control/68979d93-d12b-4d87-b110-d3d41a48b261 - ~ adapter ~ auctioneer ~ bbs ~ cc_uploader ~ cloud_controller_clock ~ cloud_controller_ng ~ cloud_controller_worker_1 ~ cloud_controller_worker_local_1 ~ cloud_controller_worker_local_2 ~ consul_agent ~ doppler ~ file_server ~ locket ~ loggregator_trafficcontroller ~ metron_agent ~ nginx_cc ~ policy-server ~ reverse_log_proxy ~ route_registrar ~ routing-api ~ scheduler ~ silk-controller ~ ssh_proxy ~ statsd_injector ~ syslog_drain_binder ~ tps_watcher ~ uaa database/a3efedaa-4df6-48f5-9f20-61cf3d9f3c1b - ~ cluster_health_logger ~ consul_agent ~ galera-healthcheck ~ gra-log-purger-executable ~ mariadb_ctrl ~ metron_agent ~ mysql-diag-agent ~ mysql-metrics ~ nats ~ route_registrar ~ streaming-mysql-backup-tool ~ switchboard mysql-rejoin-unsafe/01a0aec3-b103-4c09-bc69-cabc61c513cc - mysql_monitor/d40ef638-d2d0-488e-b937-99a7f5b5b334 - ~ replication-canary nfsbrokerpush/829f0292-59ab-4824-8b0b-c4af4bddbce0 - notifications-ui/50972440-36cd-499d-ad7c-eef4df7e604b - notifications/968d625e-af63-4e2f-a59c-f6b789ef1cff - push-apps-manager/3d9760d7-6f09-453c-a052-32604b6a3235 - push-pivotal-account/5a8782ad-82eb-4469-8242-f0873bc4a587 - push-usage-service/9b781db1-171b-4abe-92f4-7445fd3d487f - router/f9573547-c5a1-43d4-be02-38a1d9e9c73e - ~ consul_agent ~ gorouter ~ metron_agent smoke-tests/a8e2ff97-bae1-4594-90fc-ec8c430fd620 - 77 instances Succeeded
Now, with Small Footprint, you have yet another way to bring PCF to your organization!