VMware NetApp FAS 2050HA Dokumentacja Pobierz pdf (Strona 22)

NetApp Deduplication for FAS and V-Series Deployment and Implementation Guide

The cloned volume inherits the deduplication configuration of the parent volume, such as the

deduplication schedule.

Starting with Data ONTAP 7.3, the deduplication metadata files (the fingerprint database and the

change log files) do not get cloned, because they are located outside the volume in the aggregate. In

this case, there is no fingerprint database file in the cloned volume for the data that came from the

parent. However, the data in the cloned volume inherits the space savings of the original data. The

deduplication process also continues for any new data written to the clone and creates the fingerprint

database for the new data. However, the deduplication process obtains space savings in the new data

only and does not deduplicate between the new data and the old data. To run deduplication for all the

data in the cloned volume (and thus obtain higher space savings), use the sis start -s command.

Depending on the size of the logical data in the volume, this process can take a long time to complete.

Beginning with 7.3.1, in addition to standard FlexClone, FlexClone at the file and LUN level is available

and is allowed on deduplicated volumes.

Deduplication can be used to regain capacity savings on data that was copied using FlexClone at the

file or LUN level, and has been logically migrated (that is, with qtree SnapMirror, SnapVault,

NDMPdump, and so on).

For additional information regarding FlexClone, refer to TR-3742, ―Using FlexClone to Clone Files and

LUNs.‖

VOLUME SPLITTING

When a cloned volume is split from the parent volume, all of the data in the clone that was a part of the

parent volume (that is, not including the data that was written to the clone volume after the clone was

created) gets undeduplicated after the volume split operation. If deduplication is running on the clone

volume, this data gets deduplicated again in subsequent deduplication operations on the volume.

4.6 DEDUPLICATION AND ACTIVE-ACTIVE CONFIGURATION

NetApp active-active controller configurations are supported with deduplication in the following manner:

In active-active state, where both nodes of the cluster are up and no takeover has been done, dedupe

on each node will work independently of one another.

The total number of concurrent deduplication operations allowed on each node of an active-active

configuration is eight.

Writes to the flexible volume have fingerprints written to the change log.

Upon failover to the partner node, there will not be any deduplication process running for the failed

node. However, change logging for the failed node will continue to happen, and upon failback, normal

deduplication operations will resume using the updated change log. The resumed deduplication

processes will start at the times scheduled for each volume or can be started manually.

While in failover mode, the deduplication operations of the local node will not be impacted.

Data ONTAP 7.2.X has no sis administration operations or deduplication function. However, starting

with Data ONTAP 7.3, the following commands are supported for partner volumes in takeover mode:

sis status, sis stat, sis on, sis off.

Also, starting with Data ONTAP version 7.3, for SnapVault with NetBackup

™

, block sharing is supported

for partner volumes in takeover mode.

Since deduplication is a licensed option behind the NearStore option license, NetApp recommends having

both nodes in an active-active controller configuration licensed with the NearStore option and with

deduplication.

Deduplication does not add any overhead in an active-active configuration other than additional disk I/O.

For additional information regarding active-active configurations, refer to TR-3450, Active/Active Controller

Configuration Overview and Best Practice Guidelines.

4.7 DEDUPLICATION AND V-SERIES

In Data ONTAP 7.3 and later, you can use deduplication on a V-Series system with a NearStore license.

When using NetApp deduplication for FAS with V-Series, the following should be taken into consideration:

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