Exam AWS-SysOps topic 1 question 47 discussion

A High-Memory Quadruple Extra Large (m2.4xlarge) with EBS-Optimized set to true and a PIOPs EBS volume High-Memory Quadruple Extra Large (m2.4xlarge) -> Offers a balance of compute, memory, and network resources. The instances are designed to deliver fast performance for workloads such as high-performance databases, distributed web scale in-memory caches, mid-size in-memory databases, real-time big data analytics, and other enterprise applications. EBS-Optimized -> An EBS-optimized instance provides dedicated bandwidth between Amazon EC2 instances and Amazon EBS (Elastic Block Store). The optimization ensures that the network traffic does not compete with other traffic from the instance, providing consistent and high performance for your EBS volumes. This is crucial for workloads requiring sustained I/O performance, ensuring that the I/O operations are not affected by other network traffic. PIOPs EBS volume -> provide up to 256 000 IOPS

Correct Answer: C https://aws.amazon.com/blogs/aws/new-high-io-ec2-instance-type-hi14xlarge/ "This is instance storage, and it will be lost if you stop and then later start the instance. Just like the instance storage on the other EC2 instance types, this storage is failure resilient, and will survive a reboot, but you should back it up to Amazon S3 on a regular basis."

instance storage for database? I don't think so.

An instance store provides temporary block-level storage for your instance. This storage is located on disks that are physically attached to the host computer. Instance store is ideal for temporary storage of information that changes frequently, such as buffers, caches, scratch data, and other temporary content, or for data that is replicated across a fleet of instances, such as a load-balanced pool of web servers.

C AWS introduced a new family of EC2 hi1.4xlarge instances that are designed to run low-latency, I/O-intensive applications, and are an exceptionally good host for NoSQL databases such as Cassandra and MongoDB. The SSD storage is local to the instance. Using PV virtualization, you can expect 120,000 random read IOPS (Input/Output Operations Per Second) and between 10,000 and 85,000 random write IOPS, both with 4K blocks You can read more about this instance in this blog https://aws.amazon.com/blogs/aws/new-high-io-ec2-instance-type-hi14xlarge/

C. High I/O Quadruple Extra Large (hi1.4xlarge) using instance storage