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So far Sensei has created 119 blog entries.

EBS – SSD vs HDD

2019-01-28T22:08:30+00:00

EBS - SSD vs HDD On a given volume configuration, certain I/O characteristics drive the performance behavior for your EBS volumes. SSD-backed volumes, such as General Purpose SSD (gp2) and Provisioned IOPS SSD (io1), deliver consistent performance whether an I/O operation is random or sequential. HDD-backed volumes like Throughput Optimized HDD (st1) and Cold HDD (sc1) deliver optimal performance only when I/O operations are large and sequential. In the exam, always consider the difference between SSD and HDD as shown on the table below. This will allow you to easily eliminate specific EBS-types in the options which are not SSD [...]

EBS – SSD vs HDD2019-01-28T22:08:30+00:00

AWS Cheat Sheet – Security Group vs NACL

2019-01-14T03:22:08+00:00

Security Group vs NACL   Your VPC has a default security group with the following rules: Allow inbound traffic from instances assigned to the same security group. Allow all outbound IPv4 traffic and IPv6 traffic if you have allocated an IPv6 CIDR block. Your VPC has a default network ACL with the following rules: Allows all inbound and outbound IPv4 traffic and, if applicable, IPv6 traffic. Each network ACL also includes a non modifiable and non removable rule whose rule number is an asterisk. This rule ensures that if a packet doesn't match any of the other numbered rules, it's [...]

AWS Cheat Sheet – Security Group vs NACL2019-01-14T03:22:08+00:00

Security Group vs NACL

2019-01-14T03:19:37+00:00

Security Group vs NACL   Your VPC has a default security group with the following rules: Allow inbound traffic from instances assigned to the same security group. Allow all outbound IPv4 traffic and IPv6 traffic if you have allocated an IPv6 CIDR block. Your VPC has a default network ACL with the following rules: Allows all inbound and outbound IPv4 traffic and, if applicable, IPv6 traffic. Each network ACL also includes a non modifiable and non removable rule whose rule number is an asterisk. This rule ensures that if a packet doesn't match any of the other numbered rules, it's [...]

Security Group vs NACL2019-01-14T03:19:37+00:00

AWS Cheat Sheet – AWS CloudTrail vs Amazon CloudWatch

2019-01-14T03:12:50+00:00

AWS CloudTrail vs Amazon CloudWatch CloudWatch is a monitoring service for AWS resources and applications. CloudTrail is a web service that records API activity in your AWS account. They are both useful monitoring tools in AWS. By default, CloudWatch offers free basic monitoring for your resources, such as EC2 instances, EBS volumes, and RDS DB instances. CloudTrail is also enabled by default when you create your AWS account. With CloudWatch, you can collect and track metrics, collect and monitor log files, and set alarms. CloudTrail, on the other hand, logs information on who made a request, the services used, the [...]

AWS Cheat Sheet – AWS CloudTrail vs Amazon CloudWatch2019-01-14T03:12:50+00:00

AWS CloudTrail vs Amazon CloudWatch

2019-01-14T03:10:49+00:00

AWS CloudTrail vs Amazon CloudWatch CloudWatch is a monitoring service for AWS resources and applications. CloudTrail is a web service that records API activity in your AWS account. They are both useful monitoring tools in AWS. By default, CloudWatch offers free basic monitoring for your resources, such as EC2 instances, EBS volumes, and RDS DB instances. CloudTrail is also enabled by default when you create your AWS account. With CloudWatch, you can collect and track metrics, collect and monitor log files, and set alarms. CloudTrail, on the other hand, logs information on who made a request, the services used, the [...]

AWS CloudTrail vs Amazon CloudWatch2019-01-14T03:10:49+00:00

AWS Cheat Sheet – S3 Standard vs S3 Standard-IA vs S3 One Zone-IA

2019-01-14T02:59:02+00:00

Amazon S3 Standard vs S3 Standard-IA vs S3 One Zone-IA   Additional Notes: Data stored in the S3 One Zone-IA storage class will be lost in the event of AZ destruction. S3 Standard-IA costs less than S3 Standard in terms of storage price, while still providing the same high durability, throughput, and low latency of S3 Standard. S3 One Zone-IA has 20% less cost than Standard-IA. S3 Reduced Redundancy Storage (RRS) will be deprecated soon. It is recommended to use multipart upload for objects larger than 100MB. *** AWS Certified Solutions Architect is consistently among the top paying IT certifications in the world, [...]

AWS Cheat Sheet – S3 Standard vs S3 Standard-IA vs S3 One Zone-IA2019-01-14T02:59:02+00:00

S3 Standard vs S3 Standard-IA vs S3 One Zone-IA

2019-01-14T02:49:11+00:00

Amazon S3 Standard vs S3 Standard-IA vs S3 One Zone-IA   Additional Notes: Data stored in the S3 One Zone-IA storage class will be lost in the event of AZ destruction. S3 Standard-IA costs less than S3 Standard in terms of storage price, while still providing the same high durability, throughput, and low latency of S3 Standard. S3 One Zone-IA has 20% less cost than Standard-IA. S3 Reduced Redundancy Storage (RRS) will be deprecated soon. It is recommended to use multipart upload for objects larger than 100MB. *** AWS Certified Solutions Architect is consistently among the top paying IT certifications in the world, [...]

S3 Standard vs S3 Standard-IA vs S3 One Zone-IA2019-01-14T02:49:11+00:00

AWS Cheat Sheet – Amazon S3 vs Glacier

2019-01-14T02:38:02+00:00

Amazon S3 vs Glacier Amazon S3 is a durable, secure, simple, and fast storage service, while Amazon S3 Glacier is used for archiving solutions. Use S3 if you need low latency or frequent access to your data. Use S3 Glacier for low storage cost, and you do not require millisecond access to your data. You have three retrieval options when it comes to Glacier, each varying in the cost and speed it retrieves an object for you. You retrieve data in milliseconds from S3. Both S3 and Glacier are designed for durability of 99.999999999% of objects across multiple Availability Zones. [...]

AWS Cheat Sheet – Amazon S3 vs Glacier2019-01-14T02:38:02+00:00

Amazon S3 vs Glacier

2019-01-14T02:35:21+00:00

Amazon S3 vs Glacier Amazon S3 is a durable, secure, simple, and fast storage service, while Amazon S3 Glacier is used for archiving solutions. Use S3 if you need low latency or frequent access to your data. Use S3 Glacier for low storage cost, and you do not require millisecond access to your data. You have three retrieval options when it comes to Glacier, each varying in the cost and speed it retrieves an object for you. You retrieve data in milliseconds from S3. Both S3 and Glacier are designed for durability of 99.999999999% of objects across multiple Availability Zones. [...]

Amazon S3 vs Glacier2019-01-14T02:35:21+00:00

AWS Cheat Sheet – Amazon RDS vs DynamoDB

2019-01-14T01:37:42+00:00

Amazon RDS vs DynamoDB   Additional notes: DynamoDB has built-in support for ACID transactions. DynamoDB uses filter expressions because it does not support complex queries. Multi-AZ deployments for the MySQL, MariaDB, Oracle, and PostgreSQL engines utilize synchronous physical replication. Multi-AZ deployments for the SQL Server engine use synchronous logical replication. An Oracle Database is limited to one database per instance. An SQL Server is limited to 30 databases per instance. Other RDS engines have no limits. *** AWS Certified Solutions Architect is consistently among the top paying IT certifications in the world, considering that Amazon Web Services is the leading cloud services [...]

AWS Cheat Sheet – Amazon RDS vs DynamoDB2019-01-14T01:37:42+00:00

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