Module 8 - Configure Virtual Machines Availability

Question 1

Plan for maintenance and downtime

Answer 1

Unplanned hardware maintenance
When the platform predicts a failure , it will issue an unplanned hardware maintenance

Action : live migration

Unexpected downtime

Planned maintenance

Question 1

Setup availability sets

Answer 1

if you want high aval…

Configire multiple virtaul machines in an availabiltiy

Configure each apps tier

Question 2

Review update and fault domains

Answer 2

Update domains
allows azure to perform incremental or rolling upgrades across a deployment during planned maintenance , only one update domain is rebooted at a time

Fault domain
are a group of common set of hardware , switches that share a single point of failure. Vms in availability set are placed in at least two fault domains

Question 3

Review availabiltiy zones

Answer 3

Unique physical locations in a region

Incudes datacenters with independent power , cooling and networking

Protects from datacenter failures

Combines update and fault domains

Provides 99.99% SLA

Question 4

Compare vertical scaling to horizontal scaling

Answer 4

Vertical Scaling
very expensive but don’t get redundancy
Scale up and scale down is the process of increasing or decreasing power to a single instance of workload usually Manuel

Horizontal Scaling - cheaper and get redundancy

Scale out and scale in is the process of increasing or decreasing the number of instances of a workload , frequently automated

Question 5

Create scale sets

Answer 5

Where you horizontal scaling

Instance count

Instant size

Azure spot instance

use managed disks

Enable scaling beyond 100 instances

Question 6

Configure Autoscale

Answer 6

define a minimum , maximum and default number of VM instances

Create more advanced scale sets with scale out and scale parameters