Why does data display as zero in the graphs and table?
When a zero is displayed for a data point in the graphs and table, it means there is no I/O activity for the object for that point in time. This situation could occur because the host is not initiating I/O to that object, or it could be a problem with the object itself.
The historical data for the object is still available for viewing. The graphs and table will show non-zero data once I/O activity begins occurring for the object.
The following table lists the most common reasons why a data point value might be zero for any given object.
Array-level object type | Reason data displays as zero |
Volume | ● Volume had no host assignment. |
Volume group | ● Volume group is being imported. ● Volume group does not contain a volume that is assigned to a host, and volume group does not contain any reserved capacity. |
Drive | ● Drive has failed. ● Drive has been removed. ● Drive is in an unknown state. |
Controller | ● Controller is offline. ● Controller has failed. ● Controller has been removed. ● Controller is in an unknown state. |
Storage array | ● Storage array does not contain volumes. |
