You have launched an EC2 instance with four (4) 500 GB EBS Provisioned IOPS volumes attached The EC2
Instance Is EBS-Optimized and supports 500 Mbps throughput between EC2 and EBS The two EBS volumes are
configured as a single RAID o device, and each Provisioned IOPS volume is provisioned with 4.000 IOPS (4 000
16KB reads or writes) for a total of 16.000 random IOPS on the instance The EC2 Instance initially delivers the
expected 16 000 IOPS random read and write performance Sometime later in order to increase the total
random I/O performance of the instance, you add an additional two 500 GB EBS Provisioned IOPS volumes to
the RAID Each volume Is provisioned to 4.000 lOPs like the original four for a total of 24.000 IOPS on the EC2
instance Monitoring shows that the EC2 instance CPU utilization increased from 50% to 70%. but the total
random IOPS measured at the instance level does not increase at all.
What is the problem and a valid solution?
Larger storage volumes support higher Provisioned IOPS rates: increase the provisioned volume storage of
each of the 6 EBS volumes to 1TB.
The EBS-Optimized throughput limits the total IOPS that can be utilized use an EBS-Optimized instance that
provides larger throughput.
Small block sizes cause performance degradation, limiting the I’O throughput, configure the instance device
driver and file system to use 64KB blocks to increase throughput.
RAID 0 only scales linearly to about 4 devices, use RAID 0 with 4 EBS Provisioned IOPS volumes but increase
each Provisioned IOPS EBS volume to 6.000 IOPS.
The standard EBS instance root volume limits the total IOPS rate, change the instant root volume to also be
a 500GB 4.000 Provisioned IOPS volume.