Load average represents the average system load an instance experiences over a period of time.
- Warn: 4 x vCPU
- Fail: 10 x vCPU
For example: a 1 vCPU, the load would be 4.00 but a 5 vCPU, it would be 20.00.
Note: A vCPU is the same as an ECU (an Amazon EC2 Compute Unit).
For general information about how load average is calculated, see Load (computing).
The instances cpu is waiting for disk writes to complete before it can move on to other operations.
- Warn: 40% iowait
- Fail: 80% iowait
The amount of swap hard disk space used as virtual memory resources. High swap is an indication that an instance needs more memory.
- Warn: 128 MB Swap Used
- Fail: 384 MB Swap Used
Free space is monitored on these mount points:
You might not realize the instance is almost out of disk space until you get this alert. The thresholds are calculated based on the space allocated to the mount point.
- Warn: If the disk space for a particular mount point is 10 GB or less, then the warning threshold is 70% full. If the disk space is greater than 10 GB, then the warning threshold is 80% full.
- Fail: 90% of disk space is full.
The best practice is to review the content of the volume and confirm the usage is appropriate to your use case. If you do need to increase the available space it might be possible for Engine Yard Support to resize your volume online if your instance is "current generation"; if not, you will need to replace the instance with one that includes a larger volume.
If you have feedback or questions about this page, add a comment below. If you need help, submit a ticket with Engine Yard Support.