Viewing FlashCopy mappings

Attributes

Select

Allows you to select the FlashCopy mapping to use to perform an action from the task list.

Note: Only one row can be selected at a time.

Name

Displays the name of the FlashCopy mapping.

State

Displays the current state of the FlashCopy mapping. The following values are possible:

Idle or Copied

Indicates that the source and target VDisks act as independent VDisks even if a FlashCopy mapping exists between the two. Read and write caching is enabled for both the source and the target.

Preparing

Indicates that any changed write data for the source VDisk is flushed from the cache. Any read or write data for the target VDisk is discarded from the cache.

Prepared

Indicates that the mapping is ready to be started. While in this state, the target VDisk is offline.

Copying

Indicates that the copy is in progress.

Stopping

Indicates that the copy is in the stopping state.

Stopped

Indicates that the mapping has been stopped because either you issued a command or an input/output (I/O) error occurred. The copy can be restarted by preparing and starting the mapping again.

Suspended

Indicates that the mapping was started but did not complete. The source VDisk might be unavailable, or the copy bitmap might be offline. If the mapping does not return to the copying state, stop the mapping to reset the mapping.

Source VDisk

Displays the name of the source VDisk in this FlashCopy mapping.

Target VDisk

Displays the name of the target VDisk in this FlashCopy mapping.

FC (FlashCopy) Group

Displays the name of the FlashCopy consistency group that contains this FlashCopy mapping.

Partner

Displays the name of the partner FlashCopy mapping associated with this FlashCopy mapping. A partner FlashCopy mapping is a mapping which consists of the same VDisk, but the source and target VDisks are reversed. For example, if one mapping contains vdisk1 and vdisk2, where vdisk1 is the source and vdisk2 is the target, then its partner mapping consists of vdisk2 as the source and vdisk1 as the target.

Progress (%)

Displays the progress of the copy operation. The value is shown as a completion percentage of 0% - 100%.

Cleaning Progress (%)

Displays the progress of the FlashCopy mapping cleaning operation if one is in process. The value is shown as a completion percentage of 0% - 100%. The cleaning process must complete before the FlashCopy mapping moves to the stopping state.

Copy Rate

Displays the copy rate for the FlashCopy mapping. The value can be either a number 1 - 100 or NOCOPY. NOCOPY indicates the copy process is disabled. The default value is 50 (2 MB per second).

The following table shows the relationship of the copy and cleaning rate value to the attempted number of grains to be split per second. A grain is the unit of data represented by a single bit.

Table 1. Relationship between the rate, data rate and grains per second values

User-specified rate attribute value	Data copied/sec	256 KB grains/sec	64 KB grains/sec
1 - 10	128 KB	0.5	2
11 - 20	256 KB	1	4
21 - 30	512 KB	2	8
31 - 40	1 MB	4	16
41 - 50	2 MB	8	32
51 - 60	4 MB	16	64
61 - 70	8 MB	32	128
71 - 80	16 MB	64	256
81 - 90	32 MB	128	512
91 - 100	64 MB	256	1024

The data copied per second and the grains per second numbers represent standards that the SAN Volume Controller tries to achieve. The SAN Volume Controller is unable to achieve these standards if insufficient bandwidth is available from the nodes to the physical disks that make up the managed disks (MDisks) after taking into account the requirements of foreground I/O. If this situation occurs, background copy I/O contends for resources on an equal basis with I/O that arrives from hosts. Both tend to see an increase in latency and consequential reduction in throughput with respect to the situation had the bandwidth not been limited.

Restore

Indicates whether the FlashCopy mapping is being used to restore data. The following values are possible:

Yes

Indicates that the FlashCopy mapping is restoring data to the target VDisk, which is an active source VDisk of another FlashCopy mapping.

No

Indicates that either the restore option was not specified when the FlashCopy mappings was prepared or started or that the conditions that required the restore option to be specified no longer exist.

Automatically Delete

Indicates whether the FlashCopy mapping is deleted when the copy completes. The following values are possible:

Enabled

Indicates that the cluster supports the automatic deletion of FlashCopy mapping when it is done copying.

Disabled

Indicates that the cluster supports the automatic deletion of FlashCopy mapping when it is done copying; however, the function is turned off.

Not Supported

Indicates that the cluster does not have the capability to support the automatic deletion of FlashCopy mapping.

Incremental

Indicates whether the FlashCopy mapping is incremental or standard. Incremental allows the background copy process to copy only the parts of the source or target VDisk that have changed since the last FlashCopy process. A standard mapping includes the entire VDisk.