SDCS:SA offers the on-demand scan and scheduled scan options to provide protection against different types of viruses, threats, and risks.
On-demand scans are the scans that you start manually. This scan includes the scans that are triggered as a result of scan commands and antivirus policy change on guest virtual machines. You can trigger an on-demand scan on a security group or an individual guest virtual machine. To initiate a manual scan, navigate to the security group or guest virtual machine, right-click, and click Scan Now.
You can plan to run scheduled scans on the guest virtual machines by defining the scan window when scheduled scans are permitted to run. By default, no active scheduled scans are enabled to run at a specific time. Scanning happens based on the eligibility of a guest virtual machine. The eligibility criteria is determined by the last scanned time and the configured scan time interval.
The security virtual appliance can concurrently schedule scans on multiple guest virtual machines as per the maximum number of concurrent scans that are configured in the SVA Config Base Policy. The default number of concurrent scans that can be scheduled is two and the maximum is 100. If a guest virtual machine is offline, no scan is scheduled on that guest virtual machine. You cannot perform two on-demand scans concurrently on a guest virtual machine. Additional requests to scan a guest virtual machine are queued, and then run after the previous scan request is completed.
When a scan is completed, you may observe the count of files that are scanned is different from the total number of files on a guest virtual machine. The difference is observed if files are skipped from scan due to reasons such as permissions, opportunistic locking, low resources, sharing, and so on.
Imported Document ID: HOWTO95337
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