Use the View FlashCopy® Consistency Group
Relationship Details panel in the SAN Volume Controller Console to
view details of the FlashCopy mappings of the
selected consistency group.
Attributes
The
following attributes are displayed in the table:
- ID
- Displays the system-assigned identifier that is used for the FlashCopy mapping.
- Name
- Displays the name of the FlashCopy mapping.
- State
- Displays the state of the FlashCopy mapping. One of
the following values are valid for the state:
- Copying
- Indicates that the copy is in progress.
- Idle or Copied
- Indicates that the source and target virtual disks (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.
- 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 because
access to its metadata has been lost. When access to the metadata
is restored, the mapping returns to the Copying or Stopping state.
- Source VDisk ID
- Displays the system-assigned identifier of the source VDisk in
this FlashCopy mapping.
- Source VDisk Name
- Displays the name of the source VDisk in this FlashCopy mapping.
- Target VDisk ID
- Displays the system-assigned identifier of the target VDisk in
this FlashCopy mapping.
- Target VDisk Name
- Displays the name of the target VDisk in this FlashCopy mapping.
- Consistency Group ID
- Displays the system-assigned identifier 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.
- Consistency Group Name
- Displays the name of the FlashCopy consistency group
that contains this FlashCopy mapping.
- Progress (%)
- Displays the progress of the FlashCopy operation
as a completion percentage from 0% - 100%. If the state is Stopping,
the value that is displayed represents the percentage of the completed
process that is stopping the copy.
- Copy Rate
- Displays the copy rate for this mapping. The selected value
can be either a number 1 - 100 to indicate the copy rate (a higher
number indicates a faster copy rate) or NOCOPY, which
disables the copy.
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 operation 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.
Actions
The
following action is available:
- Close
- Click this button to exit this panel.