Here are some additional key points regarding AWS Storage Gateway that could be helpful for the SysOps exam:
File Gateway:
- POSIX Compliance: File Gateway provides POSIX-compliant access to data, including metadata such as ownership, permissions, and timestamps stored in S3 object metadata.
- Reboot Procedures: Restarting the Storage Gateway VM for maintenance differs based on the gateway type. For File Gateway, simply restarting the VM is sufficient.
POSIX (Portable Operating System Interface) compliance refers to adherence to a set of standards and conventions defined by the IEEE (Institute of Electrical and Electronics Engineers) for ensuring compatibility and interoperability between operating systems. In the context of AWS Storage Gateway's File Gateway, POSIX compliance means that the gateway provides access to data in a manner consistent with POSIX standards.
Volume and Tape Gateway:
- Reboot Procedures: For Volume and Tape Gateway, the Storage Gateway Service needs to be stopped before rebooting the VM for maintenance.
Activation:
- Activation Key Retrieval: Activation keys can be obtained either through the Gateway VM CLI or by making a web request to the Gateway VM on Port 80. Ensure Port 80 is open for the latter method.
- Activation Failure: Activation failures can occur due to issues such as closed Port 80 or incorrect time synchronization. Ensure the Gateway VM has Port 80 open and synchronized time using NTP.
Volume Gateway Cache Mode:
- Cached Mode: In Cached mode, only the most recent data is stored locally. Monitor cache efficiency metrics like CacheHitPercent and CachePercentUsed in CloudWatch.
- Cache Hit vs. Cache Miss: A Cache Hit means data stays within the corporate data center, while a Cache Miss requires fetching data from S3 buckets, leading to higher latency.
- Increasing Cache Efficiency: To improve cache efficiency, consider increasing the cache disk size by cloning the volume to a larger disk.
These additional details provide valuable insights into Storage Gateway operations, activation, reboot procedures, and cache management, which are essential for the SysOps exam preparation. Understanding these concepts thoroughly will help ensure success in the exam.