Garbage collection is running on an Dell Avamar server. Which activities can be performed at this time?

During garbage collection (GC), the Avamar server prioritizes data availability and allows non-conflicting operations. Restores and browsing existing backups are read-only operations that do not interfere with the GC process of reclaiming space. New backup requests from clients are accepted and placed in a queue to be processed once resources become available or after the maintenance window closes. Activities that modify backup metadata, such as deleting backups or changing retention policies, are disallowed as they would conflict with the live GC process and risk data inconsistency.

B. Deleting backups and changing retention settings are disallowed during garbage collection as they modify the metadata that the process is actively using.
C. Changing retention settings is a restricted operation during garbage collection. Modifying clients and domains is also generally blocked to prevent configuration conflicts.
D. Deleting backups is not permitted while garbage collection is running, as it creates a race condition with the space reclamation process.

1. Dell Avamar Administration Guide, Version 19.9, Page 140, "Garbage collection". The guide explains that while maintenance is running, "You can perform restore operations" and "Backups that are initiated during the maintenance window are queued." It also states that operations that change the system state are restricted.

2. Dell Technologies Knowledge Base Article 000059119, "Avamar: What is Garbage Collection and how does it work?". This article clarifies that GC locks the stripes it is working on, preventing modification (like deletion) but allowing read access for restores.