Not intuitive to the casual observer:
DiskReadBytes Bytes read from all (ephemeral) instance store volumes available to the instance.
DiskWriteBytes Bytes written from to (ephemeral) instance store volumes available to the instance.
The equivalent EBS Volume Cloudwatch metric – start with “EBS”…
EBSReadBytes
Bytes read from all EBS volumes attached to the instance in a specified period of time.
The number reported is the number of bytes read during the period. If you are using basic (five-minute) monitoring, you can divide this number by 300 to find Read Bytes/second. If you have detailed (one-minute) monitoring, divide it by 60.
Unit: Bytes
EBSWriteBytes…
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