Copy queue

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The copy queue graphic displays volume and count information for a cluster’s incoming copy queue. This graphic is visible on the main view of the Grid Summary panel when incoming copies are queued for that cluster.

Note: Queue volume is displayed in decimal and binary units. Refer to the topic Data Storage Values in the Related information section for a discussion of the difference between these units.
The copy queue graphic is a vertical bar graphic that is shown to the right of a cluster image when any copy queue exists. Table 1 describes the information displayed on the copy queue bar. Hover over the bar to show a pop-up window containing additional information, as described in Table 2. Click the vertical bar to launch the Incoming Copy Queue panel for the cluster.
Copy Queue properties displayed include:
  • The queue peak over a 24-hour period
  • The total size of all combined queues
  • The total size of combined normal and expected queues
  • The total size of combined abnormal and unexpected queues
  • The growth trend of the overall queue
Table 1. Information displayed on the copy queue graphic
Bar element Description Example
Peak Queue The maximum volume of the incoming copy queue over a 24-hour period. The copy queue bar example Figure 1 displays the following values:
  • 24-hour queue peak = 650.47 GiB
  • Total deferred copies = 648.29 GiB
  • Deferred copies that are Immediate-deferred = 2.18 GiB
Figure 1. Copy queue vertical bar
Image is a stacked vertical bar graphic representing the cache queue. Three labeled areas represent the 24-hour queue peak, the total amount of the queue consisting of deferred copies, and the amount of deferred copies which are immediate-deferred. The trending arrow shown is green and descending.
Expected/Normal Queue The total volume of current queues that are expected to occur during normal operations, including:
Immediate
Immediate mode copies can be queued if more devices exist on the outgoing clusters than what is available on the incoming cluster.
Deferred
Deferred mode copies are always queued when a cluster operates in deferred mode. Additionally, when a 25 GB logical volume is shared between two or more clusters, it is queued as deferred.
Family-deferred
Family-deferred copies are queued when the copies are being held for a family-associated cluster.
Time Delayed
Time Delayed copies are queued based on the time of the copy creation or the time of the last write to the copy.
This total is shown by the blue segment of the copy queue bar graphic.
Unexpected/Warning The total volume of current queues that have resulted from unexpected or abnormal operations, including:
Immediate-deferred
When a target cluster is failed or offline, immediate mode copies can be queued and deferred until that cluster is restored to an online state.
Synchronous-deferred
When a target cluster is failed or offline, synchronous mode copies can be queued and deferred until that cluster is restored to an online state.
Copy Refresh
Copy refresh copies are queued when a library request command is invoked to migrate copies to new clusters.
This total is shown by the yellow segment of the copy queue bar graphic.
Trending arrow The queue trend arrow shows whether the total combined queue is growing (up arrow) or shrinking (down arrow).
Hover over the copy queue graphic to display the pop-up window containing additional information about the copy queue, including:
Table 2. Details shown in the Copy Queue information pop-up window
Element Description Example
Peak Queue The maximum volume of the incoming copy queue over a 24-hour period. The copy queue pop-up window example Figure 2 explains values that are displayed on the cache queue vertical bar as shown in Figure 1.
Figure 2. Copy queue pop-up window
Queue Counts A value is shown for every queue currently existing on the cluster. The following Normal/Expected queues are shown in blue:
  • Immediate
  • Deferred
  • Family-deferred
  • Time delayed
The following Unexpected/Warning queues are shown in yellow:
  • Immediate-deferred
  • Synchronous-deferred
  • Copy refresh
Longest Queued Copy The length of time that the oldest copy has resided in the queue. Value is displayed as: hh:mm:ss. Time Delayed Copy queue items are not included in this element display
Longest Time Delayed Copy The length of time that the oldest Time Delayed Copy has been in the queue. Value is displayed as: hh:mm:ss. This line is only visible if Time Delayed Copies exist in the queue.
Longest Time Family Deferred Copy The length of time that the oldest family deferred copy has resided in the queue. Value is displayed as:hh:mm:ss. Time Delayed Copy queue items are not included in this element display.
Queue Trend Whether the queue volume trend has been increasing or decreasing during the past 15 minutes.