HP A3550A - High Availability Disk Arrays Model 20 Storage Enclosure User Manual page 280

Figure 6-10 First Report Page for a Unit Verify
Field Description
State Indicates that a Verify or Sniff is currently running.
Sniffing Indicates whether this feature is Enabled or Disabled.
% Complete Indicates the completion percentage of the operation (0 to 100).
6-32 Viewing Maintenance Information