Guaranteed Questions Flashcards
What’s the difference between file “unstructured” and block “structured” data?
unstructured– most difficult and expensive to protect, highest amount of data redundancy, ex: photos, videos
structured– easiest to protect, a moderate amount of data redundancy, ex: addresses, phone #s
What’s the difference between a SAN and a NAS including the protocols?
SAN: Storage area network, used for block data, FC/iSCSI
NAS: Network-attached storage, used for file data, CIFS/NFS
What is unified storage and what is the value of it?
unified- stores both file and block data on one storage array, enables a single point of management for both/simplifies mgmt/reduces cost
What are the three workload requirements and why should we care?
Capacity, availability, performance
- all need to be functioning and performing well for the app/workload to function
What are the input and output?
data “write” or “input” is new data that is being saved or existing data that is being changed’
data “read” or “output” is existing data that is being reviewed by a business user
What is the difference between scale-up and scale-out?
SCALE UP
array scales with capacity only, and is limited to 2 storage processors
- scaling w/ drives only
SCALE OUT
array scales with compute and capacity
- scaling w/ drives and processors
What % of IT budgets are spent to keep the lights on? Why is this an issue?
70% is put into keep lights on, Dell EMC wants to flip this, limited innovation means loss of competitive advantage which is an issue
What are some of the benefits of flash technology?
Higher performance: higher IOPs, consistent response times
Greater efficiency: higher capacity, denser, lowest $ / IOPs, lower power and cooling, smaller footprint, more reliable, simple
Give me your Dell EMC message.
say it
What does it mean when we have active active processors?
both controllers are available to support LUNs and volumes rather than having LUNs only assigned to one controller
How is flash cost-efficient? What can I do with flash that can take up less space in a way?
It’s way more durable, won’t break as often
more can be stored on flash, smaller footprint, power and cooling money can be saved as well
What is direct-attached storage? What are the challenges of it?
can be achieved by
- storage located inside the server
- storage is attached as a separate enclosure outside the server
challenges– app and data siloed to create one point of failure, limited scalability
What is latency?
delay between a user’s action and an application’s response to that action
What is virtualization? What does it allow me to do?
provides a logical view of physical computing by deploying a hypervisor, allows me to simplify infrastructure by consolidating many virtual entities
What are the main components in a data center?
end user devices, LAN, WAN, servers, networking, cabeling, SAN, NAS
