#5: Storage Fundamentals (Part 1) Flashcards
What is RAM/cache and what function does it serve?
serves as temporary storage
Difference between cache and RAM
cache: component in a computer that stores data so that future requests for data can be served faster
What are HDD’s and Flash used for and what is the diff between them?
used for storage, flash has better performance, higher capacity, more cost-efficient, compact, no moving parts
Why are customers moving towards flash?
gotten cheaper, more cost-efficient, no moving parts, less likely to break
Define latency
round trip delay until the user sees the next screen
What is RAID?
redundant array of independent disks, collection of hard drives to increase the reliability and redundancy of data storage on hard drives
Use RAID because it provides
protection, aggregate capacity, aggregate performance
Mirroring
copy all data from 1 drive to another
Parity
Mathematical formula to replace all missing data
What is DAS?
can be achieved in 2 ways:
- Storage is located inside the server
- Storage is attached as a separate enclosure outside the server
What are the benefits of DAS? Drawbacks?
Benefits: Inexpensive (vs. shared storage), simple to deploy and configure
Drawbacks: limited scalability, application and date siloed creating single point of failure
What is shared storage?
shared by multiple computers and servers, benefiys include increased app availability, data can be accessed by another user, etc.
Difference between DAS and shared storage
shared storage does not have one single point of failure, scalability is not limited
What is a unified storage array? Benefit of unified storage?
shared storage device that provides consolidated block and file services, apps and users access data over shared network
benefits: low latency, high agility, modern
