Normally graphs are displayed with various colors against a white background. If data is unavailable for any reason the graph will be filled with a pattern to indicate the specific reason for data unavailability:
The gray pattern indicates that the given statistic was not
being recorded for the time period indicated. This is either because the user
had not yet specified the statistic or because data gathering had been
explicitly suspended.
The red pattern indicates that data gathering was
unavailable during that period. This is most commonly seen because the system
was down during the time period indicated.
The orange pattern indicates an unexpected failure while
gathering the given statistic. This can be caused by a number of aberrant
conditions. If it is seen persistently or in critical situations, contact your
authorized support resource and/or submit a support bundle. For more information
on how to submit a support bundle, see Working with
Support Bundles in Oracle ZFS
Storage Appliance Customer Service Manual .