Use the Deleting FlashCopy® Mapping
panel in
the SAN Volume Controller Console to
delete a selected FlashCopy mapping. You cannot
delete an active mapping. The mapping must be stopped before it can
be deleted.
Attributes
The
following attributes are displayed in the table:
- 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:
- 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. The source VDisk
is in write-through mode and does not use cache.
- 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 has 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. The copying resumes
when the source VDisk becomes available. If the mapping does not return
to the copying state, stop the mapping and reset the mapping.
- Source VDisk
- Displays
the name of the source virtual disk in this FlashCopy mapping.
- Target VDisk
- Displays the name of the
target virtual disk in this FlashCopy mapping.
- Consistency Group
- Displays
the name of the FlashCopy consistency group
that contains this FlashCopy mapping.
- Progress (%)
- Displays the progress
of the copy operation as a completion percentage
from 0% to 100%.
- Cleaning
Rate
- Displays the current cleaning rate for the FlashCopy mapping.
The cleaning process must complete before the FlashCopy mapping
can go to the stopping state. See Table 1 for details.
- Copy Rate
- Displays the
copy rate for this mapping. You
can select a number 1 - 100 to indicate the background copy rate (a
higher number indicates a faster copy rate) or NOCOPY,
where the copy process is disabled.
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.
- 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
- This
value is yes or no. If the value is No, the Copy Type is
standard, which indicates that the entire VDisk is included. If the
value is Yes, only the parts of the source or target VDisk that have
changed since the last FlashCopy process are copied.
Actions
The
following actions are available:
- OK
- Click
this button to delete the mapping.
- Cancel
- Click this button to exit the panel without deleting the mapping.