Use this page to select source volumes for a single FlashCopy® relationship
(a single target volume for each source volume) or for a multiple relationship FlashCopy (a
single source volume and multiple target volumes). You can select one or more
source volumes.
Introduction
When
you create a FlashCopy relationship
between a source and target volume, data is copied from the source volume
to its associated target volume. When you select source and target volumes,
the volumes must reside in the same storage unit; however, the source and
target volumes can be in different LSSs.
Source volume selection
guidelines: - You cannot select all volumes in the table as FlashCopy source
volumes because there must be volumes that are available to select associated FlashCopy target
volumes. The number of source volumes that you select must be less than or
equal to the number of remaining, unselected volumes to be used as target
volumes.
- A volume can only be a FlashCopy source volume or a FlashCopy target
volume at any given time.
- You cannot select a FlashCopy source volume that is already identified
as a FlashCopy target
volume.
- You can copy a FlashCopy source volume to multiple (up to 12) FlashCopy target
volumes. You cannot select a FlashCopy source volume that is participating in
more than 12 FlashCopy relationships
at one time.
Menu path
Fields
- Storage complex
- The nicknames of storage complexes that are available for selection. This list includes any 2107 and 1750 storage complexes and 2105 Copy Services domains that have
been added using the Storage complex main page. A storage complex describes
a group of storage units such as the DS6000™s that
are managed by a single management console. If you have only one DS6000 storage unit, your storage complex consists of one storage unit. The
default value for this field is "None selected". This field is hidden unless
the Create FlashCopy Wizard has been accessed by the Global Mirror page.
- Storage unit
- The nicknames of storage units that are available for selection. This
list includes any nickname that is associated with any 2107,
1750 or 2105 Model 800 that is currently displayed on the Storage units main
page. The default value for this field is "None selected". This field is
hidden unless the Create FlashCopy Wizard has been accessed by the Global
Mirror page.
- Resource type
- The type of resource from which to select target volumes. You must select
one type of resource from the drop-down menu. The type of resource that defaults
corresponds to the selection that you made on the FlashCopy main page. The
following values are available for type of resource:
- LSS: The logical subsystem identifier. An LSS is a group of logical volumes
that have the same disk format, either count key data (CKD) for zSeries environments
or fixed block (FB) for open-system environments. There is a one-to-one mapping
between a CKD logical subsystem and a zSeries control-unit image. For zSeries
hosts, a logical subsystem represents a logical control unit (LCU). Each control-unit
image is associated with only one logical subsystem.
- Host attachment: A host attachment identifier that specifies the host
type, attachment port type (either FC Switch fabric [P-P] or FC Arbitrated
loop), and worldwide port name (WWPN) of a host port.
- Volume group: A collection of logical volumes that is specified as a nickname.
- Show All volumes: Displays all volumes that are eligible to be selected
as target volumes for the selected source volume.
- The value in this field determines the Specify field that is displayed
to the right of this field. The following resource type values and the respective
field names are displayed:
- For LSS: Specify LSS
- For Host: Specify Host attachment
- For Volume Group: Specify Volume group
- For Show All Volumes: Specify Storage type
- Specify LSS
- The list of LSS identifiers that are available for selection. An
LSS is a group of up to 256 logical volumes that have the same disk format,
either count key data (CKD) for zSeries environments or fixed block (FB) for
open-system environments. The default value for this field is "None selected".
- Specify Host attachment
- The list of host attachment identifiers that are available for selection. A host attachment identifier specifies the host type, attachment
port type (either FC Switch fabric (P-P) or FC Arbitrated loop) and worldwide
port name (WWPN) of a host port. The default value for this field is "None
selected".
- Specify Volume group
- The list of volume groups that are available for selection. A
volume group, specified as a nickname, is a collection of logical volumes.
The default value for this field is "None selected".
- Show All volumes
- The list of volume types that are available for selection. The entries in the list are "None selected", "All FB Volumes",
and "All CKD Volumes". If "None selected" is selected, the table is empty.
For the zSeries® environments,
the data that is stored in a storage unit is arranged in a count-key-data
(CKD) format. For the open system environments, the data that is stored in
the storage unit is arranged in a fixed-block (FB) format. The default value
for this field is "None selected".
- Select
- The check boxes for selecting source volumes in the table. The default
value for this field is not selected.
- Nickname
- The nickname of the volume. If there are no volumes that meet the selection
criteria that you specified, the table is empty.
- Volume Number
- The volume number (also called Volume ID).
The volume number is
a 4-digit hexadecimal value that consists of the logical subsystem (LSS) number
and the volume device number, LLVV, where LL is the LSS number
and VV is the volume device number.
- Volume type
-
- Type
- The unit type of volume capacity. The following values can display:
- DS: Specifies that the unit is 2^30 bytes (binary gigabytes).
- ESS: Specifies that the unit is 10^9 bytes (decimal gigabytes).
- Block: Specifies that the unit is 512 blocks.
- GB(2^30)
- The size, in binary gigabytes, of the volume. One binary GB (2^30) = 1 073 741 824
bytes. Volumes of Type DS are configured in binary format. This method provides
volumes that fully use the capacity in every extent.
- GB(10^9)
- The size, in decimal gigabytes, of the volume. One decimal GB (10^9)
= 1 000 000 000 bytes. ESS 2105 volumes are configured in decimal format.
- Extent Pool
- The nickname of the extent pool to which the volume is assigned.
Note: An
extent pool is a grouping of extents. An extent is a contiguous set of allocated
tracks and consists of a beginning track, an end track, and all tracks in
between. Extent size can range from a single track to an entire volume.
- < Back
- Takes you to the previous step of the wizard.
- The previous step of the Create FlashCopy wizard is Define relationship
type.
- Next >
- Takes you to the next step of the wizard. You cannot proceed to the next
step until you have completed all required fields.
- The next step of the Create FlashCopy wizard is Select target
volumes.
- Finish
- Completes the task and takes you to the main page. This button is disabled
until you enter all of the required information in the wizard.
- This button is disabled because this is not the last step of the Create FlashCopy wizard.
- Cancel
- Ends the wizard and returns you to the main page without completing the
task.
- If you click the Cancel button, the FlashCopy main page is displayed.