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If you set up an ECV service monitor, you can monitor not only the availability of a port or service on a server, but also the availability of a specific file on a particular server. An ECV service monitor verifies whether a specific file is available via the HTTP, HTTPS, or FTP network services.
An ECV service monitor can help you ensure that clients are getting what they are after, and that they will not get an error, whether they are looking for information, making an online purchase, or uploading software.
The way ECV works is, if the file responds appropriately to the ECV query, the server where the file resides is marked as up and the client will be sent to that server. If the file does not respond as expected to the ECV query, the server where the file resides is marked as down, and the client will not be sent to that server.
protocol <http | https | ftp>
filename "<path and file name>"
scan_level <all | first>
user "<user name for servers that require authentication>"
hashed_password "<hashed version of server password>"
Figure 4.2 shows a sample ECV statement that defines an ECV service monitor.