IBM Storwize V7000, Введение и руководство по внедрению

Страница: 394 / 670

374
IBM Flex System V7000 Storage Node Introduction and Implementation Guide
Maximum configurations for FlashCopy
Table 9-2 shows some of the FlashCopy maximum configurations.
Table 9-2 FlashCopy maximum configurations
FlashCopy presets
IBM Flex System V7000 Storage Node provides three FlashCopy presets, named Snapshot,
Clone, and Backup, to simplify the more common FlashCopy operations (Table 9-3).
Table 9-3 FlashCopy presets
FlashCopy property Maximum
FlashCopy targets per source 256
FlashCopy mappings per cluster 4,096
FlashCopy consistency groups per cluster 127
FlashCopy mappings per consistency group 512
Note: IBM Flex System V7000 Storage Node base licence has no restriction on the
number of FlashCopies allowed.
Preset Purpose
Snapshot Creates a point-in-time view of the production data. The snapshot is not intended to
be an independent copy, but is used to maintain a view of the production data at the
time the snapshot is created.
This preset automatically creates a thin-provisioned target volume with 0% of the
capacity allocated at the time of creation. The preset uses a FlashCopy mapping
with 0% background copy so that only data written to the source or target is copied
to the target volume.
Clone Creates an exact replica of the volume, which can be changed without affecting the
original volume. After the copy operation completes, the mapping that was created
by the preset is automatically deleted.
This preset automatically creates a volume with the same properties as the source
volume and creates a FlashCopy mapping with a background copy rate of 50. The
FlashCopy mapping is configured to automatically delete itself when the FlashCopy
mapping reaches 100% completion.
Backup Creates a point-in-time replica of the production data. After the copy completes, the
backup view can be refreshed from the production data, with minimal copying of
data from the production volume to the
backup volume.
This preset automatically creates a volume with the same properties as the source
volume. The preset creates an incremental FlashCopy mapping with a background
copy rate of 50.
Presets: All of the presets can be adjusted by using the Advanced Settings expandable
section in the GUI.