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snapmirror policy modify

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Modify a SnapMirror policy

Availability: This command is available to cluster and Vserver administrators at the admin privilege level.

Description

The snapmirror policy modify command can be used to modify the policy attributes.

Note Use the snapmirror policy modify-rule command to modify a rule in a SnapMirror policy.

Parameters

-vserver <vserver name> - Vserver Name

Specifies the Vserver for the SnapMirror policy.

-policy <sm_policy> - SnapMirror Policy Name

Specifies the SnapMirror policy name.

[-comment <text>] - Comment

Specifies a text comment for the SnapMirror policy. If the comment contains spaces, it must be enclosed within quotes.

[-tries <integer_or_unlimited>] - Tries Limit

Determines the maximum number of times to attempt each manual or scheduled transfer for a SnapMirror relationship. The value of this parameter must be a positive integer or unlimited . The default value is 8 .

[-transfer-priority {low|normal}] - Transfer Scheduling Priority

Specifies the priority at which a transfer runs. The supported values are normal or low . The normal transfers are scheduled before the low priority transfers. The default is normal .

[-ignore-atime {true|false}] - Ignore File Access Time

This parameter applies only to extended data protection (XDP) relationships. It specifies whether incremental transfers will ignore files which have only their access time changed. The supported values are true or false . The default is false .

[-restart {always|never|default}] - Restart Behavior

This parameter applies only to data protection relationships. It defines the behavior of SnapMirror if an interrupted transfer exists. The supported values are always , never , or default . If the value is set to always , an interrupted SnapMirror transfer always restarts provided it has a restart checkpoint and the conditions are the same as they were before the transfer was interrupted. In addition, a new SnapMirror snapshot is created which will then be transferred. If the value is set to never , an interrupted SnapMirror transfer will never restart, even if a restart checkpoint exists. A new SnapMirror snapshot will still be created and transferred. ONTAP version 8.2 will interpret a value of default as being the same as always . Vault transfers will always resume based on a restart checkpoint, provided the snapshot still exists on the source volume.

[-is-network-compression-enabled {true|false}] - Is Network Compression Enabled

Specifies whether network compression is enabled for transfers. The supported values are true or false . The default is false .

[-rpo <integer>] - Recovery Point Objective (seconds)

Specifies the time for recovery point objective, in seconds. This parameter is only supported for a policy of type continuous .

[-always-replicate-snapshots {true|false}] - This prioritizes replication of app-consistent snapshots over synchronous replication

If this parameter is set to true, it specifies that SnapMirror Synchronous relationships will lose the zero RPO protection upon failure in replicating application created snapshots. The default value is false.

[-common-snapshot-schedule <text>] - Common Snapshot Copy Creation Schedule for SnapMirror Synchronous (privilege: advanced)

Specifies the common snapshot creating schedule. This parameter is only supported for SnapMirror Synchronous relationships.

[-are-data-ops-sequentially-split {true|false}] - Is Sequential Splitting of Data Operations Enabled? (privilege: advanced)

This parameter specifies whether I/O, such as write, copy-offload and punch-holes, are split sequentially, rather than being run in parallel on the source and destination. Spliiting the I/O sequentially will make the system more robust, and less prone to I/O errors. Starting 9.11.1, enabling this feature improves the performance when the workload is NAS based and is metadata heavy. However, it will make the IO performance slower for large file workloads like LUNs, databases, virtualization containers, etc. The default value of parameter -sequential-split-data-ops is false . The parameter -are-data-ops-sequentially-split should only be used if frequent I/O timeout or "OutOfSync" has happened. Changes made by the snapmirror policy modify -sequential-split-data-ops command do not take effect until the next resync. Changes do not affect resync or initialize operations that have started and have not finished yet. The parameter -are- data-ops-sequentially-split requires an effective cluster version of ONTAP 9.6.0 or later on both the source and destination clusters.

[-sequential-split-op-timeout-secs <integer>] - Sequential Split Op Timeout in Seconds (privilege: advanced)

This parameter specifies the op timeout value used when the splitting mode is sequential. This parameter is used only for Sync relationships. Supported values are from 15 to 25 seconds. The default value of the parameter -sequential-split-op-timeout is 15 seconds . Changes made by the snapmirror policy modify -sequential-split-op-timeout-secs command do not take effect until the next resync. Changes do not affect resync or initialize operations that have started and have not finished yet.

[-disable-fast-resync {true|false}] - Disable Fast Resync (privilege: advanced)

Specifies whether fast resync for a SnapMirror Synchronous relationship is disabled or not. The default value for this parameter when a policy is created is false .

[-discard-configs <network>,…​] - Configurations Not Replicated During Identity Preserve Vserver DR

Specifies the configuration to be dropped during replication. The supported values are:

  • network - Drops network interfaces, routes, and kerberos configuration.

This parameter is supported only for policies of type async-mirror and applicable only for identity-preserve Vserver SnapMirror relationships.

[-transfer-schedule-name <text>] - Transfer Schedule Name

This optional parameter specifies the schedule which is used to update the SnapMirror relationships.

[-throttle <throttleType>] - Throttle (KB/sec)

This optional parameter limits the network bandwidth used for transfers. It configures for the relationships the maximum rate (in Kbytes/sec) at which data can be transferred. If no throttle is configured, by default the SnapMirror relationships fully use the network bandwidth available. You can also configure the relationships to fully use the network bandwidth available by explicitly setting the throttle to unlimited or 0 . The minimum effective throttle value is four Kbytes/sec, so if you specify a throttle value between 1 and 4 , it will be treated as 4 . For FlexGroup volume relationships, the throttle value is applied individually to each constituent relationship.

Examples

The following example changes the "transfer-priority" and the "comment" text of a SnapMirror policy named TieredBackup on Vserver vs0.example.com :

vs0.example.com::> snapmirror policy modify -vserver vs0.example.com -policy TieredBackup -transfer-priority low -comment "Use for tiered backups"