FAQs
Frequently asked questions...
- How does asynchronous mirroring differ from synchronous mirroring?
The Asynchronous Mirroring feature differs from the Synchronous Mirroring feature in one essential way: it captures the state of the source volume at a particular point in time and copies just the data that has changed since the last image capture. - Why can't I access my chosen mirroring feature?
Mirroring is configured in the SAN Manager interface. - What do I need to know before creating a mirror consistency group?
Follow these guidelines before you create a mirror consistency group. - Asynchronous mirroring - What do I need to know before creating a mirrored pair?
You configure mirrored pairs in the SAN Manager interface, and then manage the pairs in System Manager. - What do I need to know before increasing my reserved capacity on a mirrored pair volume?
Typically, you should increase reserved capacity when you receive a warning that the reserved capacity for a mirrored pair is becoming full. You can increase reserved capacity only in increments of 8 GiB. - Why can't I increase reserved capacity with my requested amount?
You can increase reserved capacity only in increments of 4 GiB. - Why would I change this percentage?
Reserved capacity is typically 40 percent of the base volume for snapshot operations and 20 percent of the base volume for asynchronous mirroring operations. Usually this capacity is sufficient. The capacity needed varies, depending on the frequency and size of I/O writes to the base volume and how long you intend to use the storage object's copy service operation. - Why do I see more than one reserved capacity candidate?
If there is more than one volume in a pool or volume group that meets the capacity percentage amount you selected for the storage object, you will see multiple candidates. - Why do I see Not Available values displayed in the table?
The table lists Not Available values when the data located on the remote storage array is not available to be displayed. - Why don’t I see all of my pools and volume groups?
When you create a secondary volume for the asynchronous mirrored pair, the system displays a list of all the eligible pools and volume groups for that asynchronous mirrored pair. Any pool or volume group that is not eligible to be used does not display in that list. - Asynchronous mirroring - Why don’t I see all my volumes?
When you are selecting a primary volume for a mirrored pair, a list shows all the eligible volumes. - Asynchronous mirroring - Why don’t I see all the volumes on the remote storage array?
When you are selecting a secondary volume on the remote storage array, a list shows all the eligible volumes for that mirrored pair. - Why would I update my remote storage array’s IP address?
You update your remote storage array’s IP address when the IP address of an iSCSI port changes and the local storage array is unable to communicate with the remote storage array.
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