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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
}
]
]
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