Hardware redundancy

Question 1

What is redundancy?

Answer 1

This is where you have backups to your hardware if one fails another is there

Question 2

What are the ranges of high availability?

Answer 2

How closely does a system achieve 100% uptime, two 9’s up to five 9’s being the highest with the least amount of downtime and highest cost

Question 3

What is RAID?

Answer 3

Redudant Array of incurrent or inexpensive disk

Question 4

What are the different levels of RAID?

Answer 4

RAID 0 - striping, doesn’t offer redundancy but it gives better performance and not fault tolerance
RAID 1 - Mirroring, data is backed up, it is fault tolerant, but no performance increase, 50% storage overhaed
RAID 5 -Striping w/parity, done with 3 drives , performance increase, fault tolernace as long as you have 2 arrays,
RAID 10 - 0+1: there’s perfromance increase, there is fault tolerance, but costly

Question 5

What is storage area networks?

Answer 5

A collection of network devices that are connected in multipaths with fiber technology that are connected to a large storage array.

Question 6

What is NIC teaming?

Answer 6

This is when you se two NIC cards connected in the network so if one does fail the other but this also gives better perfomance with resources shared over both

Question 7

What is cluster or load balancers?

Answer 7

This is where you use a group of hardware like servers that help load balance the network request, and then a load balancer shares that load across the groups of servers so not one is overworked

Question 8

What are the different kinds of Power redundancy?

Answer 8

There are Dual PSUs, UPS, Managed PDUs, and generators