ABAP Host Disk Activity Test

Disk activity is the process of performing read and write operations on the disk storage of the instance where the SAP application is installed. The I/O throughput of the SAP system is impacted by disk activity. High disk I/O can create bottlenecks that affect the overall performance of SAP applications and transactions. This test reports statistics pertaining to the input/output utilization of each physical disk partition on the SAP ABAP instance.

Target of the test : A SAP ABAP instance

Agent deploying the test : An internal/remote agent

Outputs of the test : One set of results for each disk partition in SAP ABAP instance being monitored.

Configurable parameters for the test
Parameter	Description
Test Period	How often should the test be executed
Host	Host name of the server for which the test is to be configured.
PortNo	Enter the port to which the specified host listens.
ClientName	Specify the ID of the client system as what the eG agent will be connecting to the SAP ABAP instance. To know how to determine the client ID to use, follow the instructions provided in Determining the Client ID/Name for the eG Agent to Connect to the SAP ABAP Instance.
SAPUser	Typically, to connect to a SAP ABAP instance and run tests, the eG agent requires the permissions of a SAP user who has been assigned with certain authorization objects. Ideally, you will have to create a new user role on the SAP ABAP instance for this purpose, associate the above-mentioned authorization objects with that role, and assign the new role to an existing SAP user. The procedure for the same has been provided in Creating a New User Role for Monitoring and Assigning it to a SAP User. Once the new role is assigned to a SAP user, specify the name of this user against SAPUser.
Password	The password of the specified SAPUser.
Confirm Password	Confirm the password by retyping it here.
SysNo	This parameter appears only if the Use SAPControl flag is set to No – i.e., if the test uses SAPJCO to collect measures. An indicator of the TCP/IP port at which the SAP server listens. For example, for a server that listens at port 3200, the SysNo will be ‘00’. Similarly, if the SAP server port is 3201, the SysNo will have to be specified as ‘01’. Therefore, in the SysNo text box specify the system number of the SAP server with which the specified client communicates. To know the system number for the ABAP server being monitored, follow the procedure detailed in Identifying the SAP Router String and System Number.
Router	This parameter appears only if the Use SAPControl flag is set to No – i.e., if the test uses SAPJCO to collect measures. If the SAP client with the specified ClientName exists in a network external to the SAP server, then a router will be used to enable the server-client communication. In such a case, specify the router string of the router in the Router text box. If both the client and the server exist in the same network, then specify ‘none’ against the Router text box. To know what is the SAP Router string for the ABAP server being monitored, follow the procedure detailed in Identifying the SAP Router String and System Number.
InstanceName	This parameter appears only if the Use SAPControl flag is set to No – i.e., if the test uses SAPJCO to collect measures. This is set to none by default. This implies that the eG agent automatically discovers the instance name at run time.
Timeout	Indicate the duration (in seconds) for which this test should wait for a response from the SAP ABAP instance. By default, this is set to 120 seconds.
JCO Version	The eG agent uses the SAP JCO library to connect to the SAP ABAP system and pull out metrics. To enable the eG agent to make this connection and query the metrics, you need to specify the version of the SAP JCO library that the agent needs to use. For instance, to instruct the eG agent to use JCO v2.1.19, it would suffice if you specify the ‘major version number’ alone against JCO Version – in the case of this example, this will be 2.x. Note that if you have downloaded the SAP JCO CONNECTOR files for SAP JCO version 3 from the SAP market place (as instructed by Downloading the SAP JCO Connector files Required for Monitoring ), then the JCO Version configuration should be 3.x.
IsPassive	If the value chosen is Yes, then the server under consideration is a passive server in a SAP ABAP cluster. No alerts will be generated if the server is not running. Measures will be reported as “Not applicable” by the agent if the server is not up.

Measurements made by the test
Measurement	Description	Measurement Unit	Interpretation
Percent usage	Indicates the percentage of disk space used by this disk partition.	Percent
IOPS	Indicates the rate at which I/O operations were performed on this disk partition.	Per second	Compare the value of this measure across disk partitions to know which disk partition is experiencing unusually high levels of I/O activity.
Response time	Indicates the time taken by this disk partition to complete a read or write operation after a request is made.	Milliseconds	Lower disk response times generally indicates better performance and faster access to data.
Average service time	Indicates the average time that this disk partition took to service each transfer request ( i.e., the average I/O operation time).	Milliseconds	A sudden rise in the value of this measure can be attributed to a large amount of information being input or output. A consistent increase however, could indicate an I/O processing bottleneck.
Average wait time	Indicates the average time that this disk partition waited for transferring the data requests.	Milliseconds
Transfer rate	Indicates the rate at which the data requests were transferred by this disk partition.	KB/sec