EMC ECS Node Disk Capacity Test

Nodes are the primary building block of the EMC ECS storage system. Each node has an array of disks attached which are managed by that node. The number of disks attached to a node depends on the performance requirement of the system.

The health of each node and capacity availability of the entire system depends on the status of disks attached to each node. This test provides the ability for the administrator to drill down to each node level to understand capacity availability and take corrective actions for capacity planning if required.

The purpose of this test is to check the status of each disk attached to the node. It monitors each disk for current availability status and capacity.

Target of the test : A Dell EMC Elastic Cloud Storage System

Agent deploying the test : A remote agent

Outputs of the test : One set of results for each disk attached to the each node in the system.

Configurable parameters for the test

Parameter	Description
Test period	How often should the test be executed .
Host	The host for which the test is to be configured. Since the storage device is managed using the IP address of its storage controller, the same will be displayed as host.
Port	The port number at which the specified host listens. By default, this is NULL.
ECS REST API Port	This is the port at which REST API connectivity is provided. By default, port 4443 is used.
Username and Password	To collect performance metrics from the target storage device, the eG agent should be configured with the credentials of a user who is vested with "read-only" privileges to access REST API of the target storage device. Specify the credentials of such a user in the Username and Password text boxes.
Confirm Password	Confirm the password by retyping it here.
Timeout Seconds	Specify the time duration for which this test should wait for a response from the storage system in the Timeout text box. By default, this is 60 seconds.

Measurements made by the test

Measurement	Description	Measurement Unit	Interpretation
Health status	Indicates if the given disk is online or offline. The checkmark indicates the disk status is good.		If majority of disks are offline, it will have a negative effect on the health and performance of the node and will put additional load on other nodes in the VDC. The values that this measure can report and their corresponding numeric values are tabulated below: Measure Value Numeric Value Good 100 Suspect 99 Bad 0 Note: By default, this measure reports the above-mentioned Measure Values while indicating the status. However, in the graph of this measure, the same will be represented using the corresponding numeric equivalents only.
Total size	Indicates total capacity available on the disk if the disk is online. This is the sum of the capacity used and the capacity available.	GB	If majority of disks are offline the total capacity of the node will be reduced. If he available capacity is below threshold you can start replacing the disks.
Allocated size	Indicates the capacity already used on the disk. The measure is reported only for online disks.	GB
Free size	Indicates the free capacity available for use on the disk. The measure is reported only for online disks.	GB	If the free size available on the node is decreasing rapidly or not sufficient for need, you may need to take action to add more capacity.
Percentage of allocated size	Indicates the Disk capacity used as a percent of total Capacity.	Percentage	If the percentage is near 100, the current node will not be able to take additional writes, that will increase load on other nodes in VDC.