My Postgresql databases are running on Google compute instances N1 with custom(26 vCPUs, 52 GB memmory) with a pessistent ssd disk 1.2TB . This setup is way underused, but keep the Read IOPS under 3k. So we reduce the setup to custom(20 vCPUs, 40 GB memmory). What couses the IOPS grows up over 7K?
The database workload still the same in both setups.