354
Cloud Computing
The missing instance types like T1, M1, C1, M2, C2 etc. were all parts
of earlier generation of
instance families. Following table provides the detail of all of the instance types available under
the present generation instance families under AWS.
Amazon Machine Instances are available at rent on a computing/hour basis. After selecting
the appropriate AMI,
user can create, launch and terminate server instances as needed while
Table 20.2
Specification of AWS general purpose, compute optimized and memory optimized
instances (as per
the data gathered in February, 2016)
Instance Family
Instance Model
vCPU
Memory (in
Gibibyte
(GiB))
Storage (in
Gigabyte
(GB))
Networking
Performance
General purpose
t2.nano
1
0.5
EBS
Low
t2.micro
1
1
EBS
Low to Moderate
t2.small
1
2
EBS
Low to Moderate
t2.medium
2
4
EBS
Low to Moderate
t2.large
2
8
EBS
Low to Moderate
m4.large
2
8
EBS
Moderate
m4.xlarge
4
16
EBS
High
m4.2xlarge
8
32
EBS
High
m4.4xlarge
16
64
EBS
High
m4.10xlarge
40
160
EBS
10
Gigabit
m3.medium
1
3.75
SSD
Moderate
m3.large
2
7.5
SSD
Moderate
m3.xlarge
4
15
SSD
High
m3.2xlarge
8
30
SSD
High
Compute
optimized
c4.large
2
3.75
EBS
Moderate
c4.xlarge
4
7.5
EBS
High
c4.2xlarge
8
15
EBS
High
c4.4xlarge
16
30
EBS
High
c4.8xlarge
36
60
EBS
10 Gigabit
c3.large
2
3.75
SSD
Moderate
c3.xlarge
4
7.5
SSD
Moderate
c3.2xlarge
8
15
SSD
High
c3.4xlarge
16
30
SSD
High
c3.8xlarge
32
60
SSD
10 Gigabit
Memory
optimized
r3.xlarge
4
30.5
SSD
Moderate
r3.2xlarge
8
61
SSD
High
r3.4xlarge
16
122
SSD
High
r3.8xlarge
32
244
SSD
10 Gigabit
355
Popular
Cloud Services
paying by the hour for active servers. The term
elastic refers to high scalability of EC2 instances
which provides the
flexibility of resizing the capacity as needed through simple web interfaces.
There are three ways customers can consume and pay for AWS EC2
instances as on-demand,
reserved and spot. In on-demand scheme, the consumers only pay as per the specified hourly
rate for the instance used. Under reserved scheme, AWS offers significant
discount over the
on-demand instance pricing. In spot-pricing scheme, the consumers have the options of setting
a maximum price tag for some instances. AWS delivers the instances to those consumers at
that tagged price (or on lower price rate when demand is very low) on supply and demand basis.
When resource demand grows too high automatically the spot price
of instances increase and
the instances are shut down so that a consumer never pays more than his/her tag price.
