Reference: Policy Pages Reference : Optimization policy settings : SnapMirror
  
SnapMirror
You configure SnapMirror settings in the SnapMirror page.
SnapMirror is mainly used for disaster recovery and replication. To provide maximum protection and ease of management, many enterprises choose to perform SnapMirror operations across the wide-area network. However, WAN links are often costly. Furthermore, the limited bandwidth and high-network latency they provide often severely degrade SnapMirror operations.
The two flavors of SnapMirror are volume-based and qtree-based. SnapMirror replicates data from one volume or qtree (the source) to another volume or qtree (the mirror). It then periodically updates the mirror to reflect incremental changes to the source. The result of this process is an online, read-only volume (the mirror) that contains the same data as the source volume at the time of the most recent update.
For detailed information about SnapMirror, see the SteelHead Interceptor User Guide or the SteelHead User Guide.
Complete the configuration as described in this table.
Control
Description
Enable SnapMirror
Select the check box to enable SnapMirror.
• SnapMirror Ports—Enter the SnapMirror port. The default is 10566.
Apply
Applies your settings.
Add a Filer/Add a Volume/Q Tree
Select the tab to display the controls for a filer.
Filer Name
Specify the name of the filer. RiOS automatically detects the volumes associated with the filer, or you can optionally add volumes to it later.
IP Address
Specify a source IPv4 address to associate with the filer, separated by a comma. You can’t specify an IPv6 address.
Filer Default Optimization Policy
You can configure the optimization level from no compression (none) to full Scalable Data Replication (SDR-Default).
SDR optimization includes LZ compression on the cold, first-pass of the data. You can also configure LZ-compression alone (LZ-only) with no SDR. For some applications, it can be more important to get maximum throughput with minimal latency, and without compression, and for others getting maximum reduction is more important.
Select an optimization policy for the default volumes and qtrees on this filer:
• SDR-Default—Performs SDR and LZ compression. This is the default policy.
• LZ-only—Performs LZ compression only. There is no SDR optimization with this policy.
• None—Disables SDR and LZ compression.
Filer Default SnapMirror Priority
Select a priority for use later in a QoS service class: Highest, High, Medium, Low, Lowest, No Setting. The default priority is Medium.
Description
Optionally, specify a volume description or provide additional comments.
SnapMirror Priority (only for Volume/Q Tree)
Select a priority for use later in a QoS service class: Highest, High, Medium, Low, Lowest, No Setting. The default priority is Medium.
Description
Optionally, specify a volume description or provide additional comments.
Add
Adds the filer to the list. The SCC redisplays the Filer table and applies your modifications to the running configuration, which is stored in memory.
Remove Selected Filers and Volumes/Qtrees
Select the check box next to the name and click Remove Selected Filers and Volumes/Qtrees.