Management of SnapMirror
- Resynchronization of FlexVol volumes
If there are any changes on the destination storage system that you need to replicate to the source, you can use qtree SnapMirror to resynchronize data.
- SnapMirror management commands and configuration files
There are several commands and configuration files for the management of SnapMirror replication.
- SnapMirror shutdown commands
You can use these commands to temporarily or permanently shut down SnapMirror processes on a storage system, volume, or qtree.
- SnapMirror advanced function commands and configuration files
You can use these commands to perform advanced functions with SnapMirror.
- Converting asynchronous SnapMirror replication to synchronous
For a SnapMirror relationship, you might have specified asynchronous replication earlier. However, if required, you can change the relationship to replicate data synchronously.
- Methods to specify destination storage systems on the source
There are two methods of specifying destination storage systems on the source storage system.
- What the snapmirror.conf file does
The snapmirror.conf file is used to specify the details related to the copying of data, by using SnapMirror, from the source to the destination. This file resides on the destination storage system.
- What restarts and retries are
In SnapMirror, a retry is an automatic attempt to start the transfer process after an interruption, whether or not any data was successfully transferred. A restart is the resumption of a previous transfer process from a restart checkpoint.
- Manual update of a SnapMirror destination
Ordinarily, SnapMirror updates the destination automatically according to the update schedule you specify in the /etc/snapmirror.conf file. However, you can also initiate updates manually with the snapmirror update command.
- Listing SnapMirror Snapshot copies
You can use the snap list command to list all Snapshot copies, including the SnapMirror-specific Snapshot copies, that are stored on your storage system.
- Checking SnapMirror data transfer status
You need to check data transfer status, using the snapmirror status command, to determine the status of all existing SnapMirror relationships on the storage system.
- Changing the maximum transfer rate for a transfer
You set the maximum transfer rate for scheduled SnapMirror transfers using the kbs option in the /etc/snapmirror.conf file. You can change the maximum transfer rate, but the changed transfer rate will only apply to the current transfer. The next scheduled transfer will use the maximum transfer rate that is specified in the /etc/snapmirror.conf file.
- SnapMirror data transfer logs
You can use the options snapmirror.log.enable command to check SnapMirror data transfer logs. You can find out whether transfers are occurring as planned, how long the transfers take, and how well the system setup works. You find this information in the SnapMirror log file.
- Aborting a SnapMirror transfer
You can use the snapmirror abort command to abort a volume or qtree copy operation before the source finishes transferring data to the destination. The transfer can be the result of a scheduled update, a manual update, or an initialization.
- Stabilizing destinations before a Snapshot copy
You might need to temporarily stop transfers to a destination. For example, if you want to create a Snapshot copy of a SnapMirror destination volume or qtree that contains a database, you need to ensure that its contents are stable during the Snapshot copy.
- Scheduled updates for volumes or qtrees
You can edit the destination’s etc/snapmirror.conf file to change or turn off scheduled updates for a particular volume or qtree if you decide that there is no need to update the destination.
- Turning off SnapMirror updates
You can use the snapmirror off command to turn off updates, both scheduled and manual, for the entire storage system at any time, even when copying is underway. Any active transfer is aborted when you turn off SnapMirror for the storage system. The destination remains unchanged after you turn off updates.
- Resizing a SnapMirror source and destination volume pair
You can increase the size of a volume SnapMirror source. In the next update, volume SnapMirror will make an identical increase to the file system size of the destination, if the destination volume size is enough to contain the larger file system size.
- Conversion of a destination to a writable volume or qtree
You can use the snapmirror break command to convert a SnapMirror destination, with read-only status, to a writable volume or qtree.
- Releasing partners from a SnapMirror relationship
To permanently end a SnapMirror relationship between a source and destination pair of volumes or qtrees, you need to use different commands on the source and destination storage systems.
- What the snapmirror resync command does
After the snapmirror break command, you apply the snapmirror resync command to either the original SnapMirror destination or the original source.
- Migrating data between volumes by using SnapMirror
SnapMirror can migrate data between volumes and redirect NFS clients to the new volume without rebooting the storage system or remounting to volume on NFS clients.
- About moving SnapMirror sources
Whether you are moving a volume SnapMirror source or qtree SnapMirror source to new storage systems or newer drives, as long as there is a Snapshot copy in common on the source and destination, the transition goes smoothly.
- Use of SnapMirror to copy a volume to a tape
You might want to use SnapMirror to copy a volume from a source storage system to a local tape for several reasons.
- Management of SnapMirror operations through Protection Manager
You can use the Protection Manager graphical user interface to perform some of the management tasks in a SnapMirror environment.
