Monitoring & Metrics Flashcards
What EBS metric measures the number of read and write operation requests that are waiting to be completed?
VolumeQueueLength
A General Purpose SSD has a base of __________ IOPS per GiB of volume size.
3
How should you recover from a failing system status check?
Stop the instance and restart it.
It will end up on another host machine.
If __________ exceeds 50MB on your Memcached cache, you should increase its __________ parameter.
SwapUsage.
memcached_connections_overhead
True or False: pre-warming is only necessary when restoring an EBS volume from a snapshot.
True.
What’s the term for removing an old item from a cache to make room for a new item?
Eviction.
The max IOPS available to a General Purpose SSD volume is __________.
10,000 IOPS
ELBs only report metrics to CloudWatch when __________.
Requests/data are flowing through it.
True or False: Provisioned IOPS SSD volumes automatically send detailed metrics to CloudWatch.
True.
If an EBS volume is degraded, or severely degraded, what will its status be?
warning
How should you recover from a failing instance status check?
Reboot the instance.
The max size of a GP2 EBS volume is __________.
16 TB
True or False: an EC2 instance status check monitors the host machine the instance is running on.
False.
The instance status check monitors the VM, not its host machine.
If an EBS volume is functioning properly, what will its status be?
ok
A GP2 volume can burst up to __________ IOPS by using I/O credits.
3,000
If an EBS volume is stalled or not available, what will its status be?
impaired
The metric that tracks the total number of requests that were rejected due to an ELB’s surge queue being full is called the __________.
SpilloverCount
The metric that tracks the total number of requests that are pending submission to instances registered to an ELB is called __________.
SurgeQueueLength
If requests/data are flowing through an ELB, it will report metrics to CloudWatch every __________.
minute
What types of EC2 metrics are provided by CloudWatch?
- CPU
- disk
- network
- status checks
True or False: an EC2 system status check monitors the instance virtual machine.
False.
The system status check monitors the host running the instance virtual machine.
What does it mean when an EBS volume’s status is impaired?
The volume is either stalled or not available.
What does it mean when an EBS volume’s status is warning?
The volume is degraded or severely degraded.
