Statistics Monitoring at Jelastic
Statistics monitoring is an easy but powerful tool that helps to manage environments smartly. The information, provided by the Jelastic in-built statistics module, covers all the billable resources' consumption, so it can help to adjust the topology according to your needs and to cut the spends greatly.
You can track the usage statistics for all the nodes in your environment: application servers, balancers, web servers and databases. For that, just click the corresponding button next to the desired instance (or set of the same-typed ones):
In the opened tab you’ll find the statistics on all the types of consumed resources and their limits:
- RAM - memory consumption (in Mb)
- CPU - processor load (in MHz)
- Network - internal and external traffic (in Mb)
- Disk - stored data amount (in Mb) and I/O operations amount (in IOPS)
Herewith, the RAM and CPU limits depend on the amount of cloudlets you’ve allocated for a node, while the Network, Disk and IOPS ones are defined by your hosting provider.
You can further analyze the presented statistics by varying the Interval and Duration settings and enabling/disabling the particular sections at the top tools panel:
Note: Jelastic PaaS collects statistics every minute and stores it for an hour to implement an accurate Pay-per-Use charging approach. Afterward, the data is automatically aggregated into the one-hour blocks, using one of the two methods based on the particular resource type:
- a sum of all values for CPU, Network, Disk IOPS and Disk IO
- the maximum value for RAM and Disk
To get an additional information on resources charging, see the corresponding document.
And below we’ll consider the specifics of I/O usage tracking in more details.
I/O Usage Monitoring
The Input/Output Operations per Second amount monitoring is the very common and popular storage measurement method, which helps to analyze the container’s efficiency based on its ability to handle a particular number of read and write operations simultaneously without the performance degradation.
1. IOPS data is shown within the Disk statistics section by means of the second axis to the right of the graph (we’ve disabled all the rest of sections to concentrate on the information we are actually interesting in):
Obviously, the more operations are handled - the higher the system load is. Thus, to avoid the hardware efficiency degradation, the allowed IOPS amount is limited - the appropriate threshold (defined by your hosting provider) is marked with the red dotted line at the top of the graph.
Reaching this point implies that the performance of your container can be negatively affected, so it is needed to enlarge the number of servers used or to optimize the application itself.
2. Upon hovering over the particular point at the Disk/IOPS graph, you’ll see the popup tooltip with the following details:
- date and time of the gathered stats
- Disk - the amount of space container is actually using
- Disk space limit - the maximum amount of data that is allowed to be stored in a container
- IOPS - the number of I/O operations handled during the stated Interval
- IOPS limit - the maximum number of I/O operations, allowed to be performed by container during the stated IntervalNote: that both limits (i.e. for Disk space and IOPS) are displayed in a single line, named Limit in the chart’s legend. Herewith, particular threshold values for each of these resource types can be seen at the appropriate axes to the left and right - for the used disk space and the amount of IOPS respectively.
3. As it was mentioned above, the IOPS limit depends on the Interval chosen. So, for example, if you state 1 hour Interval for your environment, the prior limit for 1 minute (which is equal to 6000 - see the image in the previous step) will be increased in 60 times (as 1 hour = 60 minutes):
6000 * 60 = 360 000
In such a way, you are provided with the actual disk load information and get the ability to monitor its state in real time.