ISC2 Certified Cloud Security Professional (CCSP) Practice Question
An engineer must migrate a latency-sensitive OLTP database cluster to a public IaaS provider. Each database node will run inside its own virtual machine and requires storage that can sustain tens of thousands of small (8-kB) random read/write IOPS with sub-millisecond latency. The database depends on standard block-level filesystem semantics such as in-place updates and POSIX file locking, and the team wants the cloud provider to handle point-in-time incremental snapshots for backup. Which native cloud storage service type best meets these requirements?
Managed network file system (NFS) share presented as a mounted directory to each VM
Low-cost archive storage class intended for long-term, infrequently accessed data
Object storage bucket accessed over HTTPS with eventual consistency guarantees
SSD-backed block storage volumes that can be attached to individual virtual machines and snapshotted
Block-level SSD-backed persistent disks are engineered to present a virtual hard drive to the guest operating system. Because they operate at the block layer they support traditional filesystem features such as in-place updates, journaling, and file locking that databases expect. SSD tiers are optimized for very high random I/O rates and low latency, and most public IaaS platforms let you take incremental snapshots of these volumes for backup or cloning. Object storage and archive tiers expose REST APIs rather than block devices, are optimized for throughput over latency, and typically offer eventual (or at best read-after-write) consistency-making them unsuitable for a transactional database that needs synchronous block updates. Managed NFS shares provide file-level, not block-level, access and usually deliver lower, more sequential-workload-oriented performance than dedicated SSD block volumes. Therefore, attaching SSD-backed block storage volumes is the most appropriate choice.
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ISC2 Certified Cloud Security Professional (CCSP)
Cloud Platform & Infrastructure Security
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