Module 3: Modern Data Center Environment (Storage) Flashcards
What is a HDD (hard disk drive)?
data stored on ferromagnetic coated disk and provdes random read/write access
What is a SSD (solid state drive)?
data stored on semiconductor based memory - much sturdier architecture than spinning disk
What are the characteristics of SSDs?
very low latency per IO
low power requirements
high throughput
What are HDDs typically used for?
larger storage capacities
What is NVMe (non-volatile memory express)?
high performing software for PCIe SSDs that use NVM
What are the benefits of NVMe?
takes advantage of microsecond latency of AF arrays
eliminates SCSI bottlenecks
greater storage throughput/lower latency
What is SCM (storage class memory)?
high perfoming non-volatile storage for digital transformation
What are the benefits of SCM?
memory like speed at storage costs
slower than DRAM but faster than flash
can support high IOPS w/ comparable flash throughput
What is DAS?
storage devices connected directly to servers - typically local server storage
What are the limitations of DAS?
number of storage devices is limited
not possible to scale storage capacity
What does HCI implementation allow in a DAS environment?
internal storage devices can be shared among compute systems in cluster
What is a SAN environment?
storage devices exist independently of servers
What are the benefits to a SAN environment?
capacity can be increased dynamically without impacting availability
improves capacity utilization and more cost effective
What is storage virtualization?
abstracting physical storage to create virtual storage resources
What are logical storage resources in storage virtualization?
virtual volumes
virtual disk files
virtual storage system
