Expected max PIOPS for db.r5b instances

Question

Hi,  
  
I'm seeking clarification on the maximum provisioned IOPS performance for a db.r5b.8xlarge.   
  
According to https://aws.amazon.com/blogs/aws/new-amazon-ec2-r5b-instances-providing-3x-higher-ebs-performance/, this instance type is capable of 86,667 IOPS. With provisioned IOPS of 80k, we are observing a ceiling at 32k, with a significant IO queue.   
  
I noticed that on https://aws.amazon.com/rds/instance-types/, it does not mention that r5b is Nitro enabled, while r5 types are. However, https://aws.amazon.com/blogs/aws/new-amazon-ec2-r5b-instances-providing-3x-higher-ebs-performance/ mentions that r5b types are all nitro enabled.  
  
Is there a reason that an db.r5b.8xlarge instance would not achieve more than 32k IOPS?

Answer

Hi,   
r5b.8xlarge does support baseline IOPS of 86k. See the output below.  
There are often workload related factors why your experience might not be able to drive this level of IOPS. I dont see any active instances in your account with this setup so it is difficult to comment on why you are not observing higher IO rate.  
-Phil  
  
$ aws ec2 describe-instance-types --instance-types r5b.8xlarge --query "InstanceTypes\[*].\[InstanceType, EbsInfo.EbsOptimizedSupport, EbsInfo.EbsOptimizedInfo]" --output json  
\[  
    \[  
        "r5b.8xlarge",  
        "default",  
        {  
            "BaselineIops": 86667,  
            "MaximumThroughputInMBps": 2500.0,  
            "MaximumIops": 86667,  
            "MaximumBandwidthInMbps": 20000,  
            "BaselineThroughputInMBps": 2500.0,  
            "BaselineBandwidthInMbps": 20000  
        }  
    ]  
]

Expected max PIOPS for db.r5b instances

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