Amazon EC2 - Notes - 03 - RAID

AWS > Compute > Amazon Elastic Compute Cloud (EC2):

RAID (Redundant Array of Independent Disks)
1. RAID 0: Striped, no redundancy, good performance.
2. RAID 1: Mirrored, redundancy.
3. RAID 5: Good for read, bad for writes, AWS does NOT recommend ever putting RAIS 5's on EBS.
4. RAID 10: Striped & Mirrored, good redundancy, good poerformance.

How Can I Take a Snapshot of a RAID Array?
Problem: Taks a snapshot, the snapshot excludes data held in the cache by applications and the OS. This tend not to matter on a single volume, however using multiple volumes in a RAID array, this can be a problem due to interdependencies of the array.

Solution:
1. Stop the application from writing to disk.
2. Flush all caches to the disk.

How can we do this:
1. Freeze the file system.
2. Unmount the RAID array.
3. Shutting down the associated EC2 instance.


Reference:
1. AWS Documentation - RAID Configuration on Windows:
https://docs.aws.amazon.com/AWSEC2/latest/WindowsGuide/raid-config.html

2. Udemy - AWS Solutions Architect - Associate:
https://www.udemy.com/aws-certified-solutions-architect-associate/


最初發表 / 最後更新: 2019.03.21 / 2020.03.08