Replication Configuration Wizard - In-System Clone

Ops Center Protector User Guide
Version
7.9.x
Audience
anonymous
Part Number
MK-99PRT002-10
ft:lastEdition
2024-12-11
Figure. Replicate Configuration Wizard - In System Clone (ShadowImage) - Configure Capacity Savings
Control Description
Capacity Saving Mode One of the following options:
  • Match Source Volumes – When provisioning S-VOLs Capacity Saving will match the settings of the source volumed.
  • Compression - When provisioning S-VOLs Compression will be enabled, the data compression function utilizes the LZ4 compression algorithm to compress the data.
  • Deduplication and Compression - When provisioning S-VOLs Deduplication and Compression will be enabled. The data deduplication function deletes duplicate copies of data written to different addresses in the same pool and maintains only a single copy of the data at one address.
  • None - When provisioning S-VOLs Capacity Saving will not be used
Capacity Saving Process Mode Only available when a Capacity Saving Mode other than None is selected. Can be one of the following:
  • Inline - When you apply capacity saving with the inline mode the compression and deduplication processing are performed synchronously for new write data. The inline mode minimizes the pool capacity required to store new write data but can impact I/O performance more than the post-process mode.
  • Post Process - When you apply capacity saving with the post-process mode the compression and deduplication processing are performed asynchronously for new write data.
  • Storage Default – match the default option set on the storage array.
  • Match Source Volume – match the settings of the source volume.
Cancel Discards all changes and reverts to the previous page.
Previous Takes the user to the previous screen in the wizard.
Next Takes the user to the next screen in the wizard.
Figure. Replicate Configuration Wizard - In System Clone (ShadowImage) - Configure Pool etc.
Control Description
Pool Specifies the target storage pool from which replication LDEVs are allocated.
Provides a list of available pools giving name and available space.
Note: All replication types have pool except Asynchronous Remote Failover (Universal Replicator).

Select a Dynamic Provisioning Pool for all replication types.

Note: Dynamic Provisioning Pools must be created using Storage Navigator prior to selecting the Target Storage/Pool in Protector.
Mirror Unit The mirror unit number for the replication can be set to 0, 1 or 2. Select Allocate Automatically to allow Protector to choose one.
Note: If the mirror unit of an active replication is changed after initial data flow activation then:
  1. S-VOLs and pairing relationships for the replication will be destroyed (or dissociated if previously adopted).
  2. The replication will then be recreated (or readopted if previously adopted) on data flow reactivation. A warning is issued by the rules compiler prior to activation.
Copy Pace Determines how quickly the storage array copies data. The array’s default is Slow (3), Protector defaults to Medium (8).
Use Consistency Group All P-VOLs in a replication are, by default, placed in the same consistency group to ensure consistency of data across all volumes. This option allows this behavior to be disabled.
Quick Resync/Split If selected, then Quick Split and Quick Resynch operations are performed by the storage hardware in the background, so that the secondary is available for reading/writing almost immediately after the replication is paused or resynchronized (depending on downstream data flow operations). If deselected then Steady Split and Normal Copy operations are performed in the foreground and the secondary is made available only once the operation is completed.
Cancel Discards all changes and reverts to the previous page.
Previous Takes the user to the previous screen in the wizard.
Next Takes the user to the next screen in the wizard.
Figure. Replicate Configuration Wizard - In System Clone - ShadowImage - DRU Options

If Fully Provisioned is selected on the Provisioning Options page on this wizard, these options are enabled to specify Data Retention Utility (DRU) protection parameters.

CAUTION:
Protector cannot mount a DRU protected snapshot. However a cascaded snapshot can be created and mounted if the original has Cascade mode enabled.
Control Description
Protection Type One of the following can be selected:
  • None - DRU protection is not applied the snapshot
  • Host Read Only (wtd) - Prevents hosts writing to the snapshot LDEV.
  • Full (wtd + svd) - As for wtd, plus the array is prevented from changing the contents of a snapshot LDEV using resync or restore. It also prevents deletion, mapping and unmapping of the snapshot from its LDEV.
Note: DRU can prevent mounting if the OS rejects a read-only volume (mount via cascade snapshot is unaffected, and therefore recommended).
Duration Of Settings Lock (Days)
CAUTION:
DRU protection cannot be removed while the lock is active.
Specify a duration in days during which the applied DRU protection cannot be removed. Once this duration has expired the protection is not automatically removed; it must be removed manually.
Cancel Discards all changes and reverts to the previous page.
Previous Takes the user to the previous screen in the wizard.
Next Takes the user to the next screen in the wizard.
Figure. Replicate Configuration Wizard - Configure Resource Group
Control Description
Configure Resource Group Specifies the resource group to be used for S-VOLs, in order to support snapshots and replications from VSM volumes (adding volumes to a VSM is performed by adding the volumes to the correct resource group).
Note: If there are existing S-VOLs, then the resource group used by those will be selected. If the existing S-VOLs are in multiple resource groups or in a resource group that contradicts the user selection, then the operation will fail with an error. This setting should not be modified for existing replications.
  • Automatically Selected - Allows Protector to automatically select a resource group in the following order of priority:
    1. If there are existing S-VOLs, then the resource group used by those will be selected.
    2. The resource group used by the P-VOLs, if the replication is in-system and the P-VOLs are all in one resource group.
    3. Resource group 0.
    Note: If existing S-VOLs are in multiple resource groups, then the operation will fail with an error.
  • User Selected - The user specifies the Resource Group.
Cancel Discards all changes and reverts to the previous page.
Previous Takes the user to the previous screen in the wizard.
Next Takes the user to the next screen in the wizard.
Figure. Replicate Configuration Wizard - Select Connection Type
Control Description
Select protection type Specifies whether to configure the replication via Host Groups or through an NVMe subsystem.
Cancel Discards all changes and reverts to the previous page.
Previous Takes the user to the previous screen in the wizard.
Next Takes the user to the next screen in the wizard.

If the NVMe option is selected the following screen is displayed:

Note: This screen is not displayed for an adopt dataflow.
Control Description
NVMe Subsystem Pre-existing NVMe Subsystem to create namespaces in for each secondary volume that is created.
Namespace ID Consistency How the namespace ids consistency between primary and secondary volumes should be managed
  • None – Use the automated storage system namespace id allocation, by default this incrementally counts up for each created namespace in an NVMe subsystem.
  • None – Use the automated storage system namespace id allocation, by default this incrementally counts up for each created namespace in an NVMe subsystem.
  • Enforced – March the namespace ids for the primary and secondary volumes and fail if this is not possible.
Registered Host NQNs Select one or more host NQNs that are registered with the NVMe subsystem. A namespace path for each host nqn and namespace will be created as required if namespace security is enabled.
Add Registered Host NQN Adds another registered host NQN selection.
New Host NQNs Enter one or more new host NQNs. The host NQN will be registered with the NVMe subsystem. A namespace path for each host nqn and namespace will be created as required if namespace security is enabled.
Cancel Discards all changes and reverts to the previous page.
Previous Takes the user to the previous screen in the wizard.
Next Takes the user to the next screen in the wizard.
Figure. Replicate Configuration Wizard - Secondary Volume Host Groups (In-System Clone)
CAUTION:
If replication S-VOLs are exposed to a host, the user is responsible for ensuring they are not in use during replication resynchronization. Failing to do so may result in a critical failure of the host.
Note: Protector analyses the LUN IDs of the P-VOLs in all host group paths and, if consistent and available, uses these LUN IDs for all S-VOL host group paths either during initial set-up, mounting, or when adding additional LUNs on demand.

To provide a graceful fallback:

  • If the P-VOL LUN IDs are not consistent in all host group paths Protector will still use a consistent ID for S-VOL mappings, but these will not necessarily match any of the P-VOL LUN IDs.
  • If a P-VOL has a consistent ID in all host group paths, but this LUN ID is not available in all S-VOL host group paths then Protector will choose a different, consistent LUN ID for the S-VOL for all host group paths.
  • When not able to match LUN IDs with those used by P-VOLs and/or the S-VOLs, Protector chooses an unused LUN ID. In order to keep LUN ID’s compatible with VMware and Hyper-V when selecting LUN ID’s Protector will first attempt to select ID’s at or below 255. If this is not it will then attempt at or below 1024, followed by at or below 2048. Finally, at or below the array maximum. A warning will be displayed when an ID can not be found in a range.

Some systems expect LUN ID 0 to be used only as a boot volume. Protector will therefore only use LUN ID 0 for the S-VOL host group paths if the P-VOL LUN ID is 0.

Control Description
Use Protector Provisioned Host Group Protector will create a LUN path from each S-VOL it provisions in a placeholder host group. If this option is not selected, at least one Secondary Host Group must be specified below.
Enforce LUN ID Matching For environments where LUN ID consistency is mandatory, selecting this option will cause the replication to fail if:
  • The P-VOL does not have a consistent LUN ID in all host group paths.
  • The P-VOL LUN ID is not available in all S-VOL host group paths.
Secondary Host Groups Specify zero or more host groups that Protector will configure to provide access to the S-VOL(s) when configuring replication scenarios. If no host groups are specified here then Protector will place the S-VOL(s) in it's dummy host group.

Click the Add Host Group button to insert another Host Group selection control.

Click the Remove button next to a Host Group selection control to delete it.

Note:

If a LUN path to be created already exists, Protector will not attempt to add it again, or to change its ID.

The specified host groups must be in the same resource group as the secondary volumes.

For GAD replications, if the host group names and port IDs match between primary and secondary storage nodes, Protector will attempt to match the LUN IDs used for the S-VOLs with those of the respective P-VOLs. If this cannot be achieved then a warning will be logged and the next available LUN ID will be used.

Tip: Use this option to specify host groups that enable access to S-VOL(s) when configuring GAD cross-path and multi-path and other replication scenarios where the S-VOL(s) will need to be accessed (e.g. during failover).
Cancel Discards all changes and reverts to the previous page.
Previous Takes the user to the previous screen in the wizard.
Next Takes the user to the next screen in the wizard.
Figure. Replicate Configuration Wizard - Naming Options
Control Description
Secondary Logical Device Name Specifies how S-VOLs will be named:
  • Match Origin - The S-VOL will be given the same name as that used for the origin P-VOL (i.e. the left-most volume in the data flow).
  • Custom - The S-VOL will be named using the naming rule provided. The naming rule can consist of literal strings and/or one or more substitution variables listed. Click Display variables which can be used for the secondary LDEVs' name to view the available substitution variables:
    • %ORIGIN_SERIAL% - S/N of leftmost array in data flow. E.g. output string: 210613
    • %ORIGIN_LDEV_ID% - ID of leftmost LDEV in data flow. E.g. output string: 00:3A:98
    • %ORIGIN_LDEV_NAME% - name of leftmost LDEV in data flow.
    • %PRIMARY_SERIAL% - S/N of primary array in this operation. E.g. output string: 442302
    • %PRIMARY_LDEV_ID% - ID of primary LDEV in this operation. E.g. output string: 00:4C:EB
    • %PRIMARY_LDEV_NAME% - name of primary LDEV in this operation.
    • %SECONDARY_SERIAL% - S/N of secondary array in this operation. E.g. output string: 356323
    • %SECONDARY_LDEV_ID% - ID of secondary LDEV in this operation. E.g. output string: 01:F4:35
    • %CREATION_DATE% - date secondary LDEV was created by this operation. E.g. output string: 20180427
    • %CREATION_TIME% - time secondary LDEV was created by this operation. 1130
Cancel Discards all changes and reverts to the previous page.
Previous Takes the user to the previous screen in the wizard.
Next Takes the user to the next screen in the wizard.
Figure. Replicate Configuration Wizard - In System Clone (ShadowImage) - Summary

Shows a summary of the replication configuration specified by the user.