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?
To use either the Asynchronous Mirroring feature or the Synchronous Mirroring feature, you must have the ThinkSystem SAN Manager running on your local host through an HTTPS connection to discover the storage arrays that are mirroring-capable and to initiate the mirroring operation. From SAN Manager , you must select the storage array from which you want to mirror data from and then click Launch to open ThinkSystem System Manager . - What do I need to know before creating a mirror consistency group?
You must have the browser-based ThinkSystem SAN Manager installed, and have discovered the two storage arrays you want to mirror data between. Then, from SAN Manager , you select the primary volume's storage array and click Launch to open the browser-based ThinkSystem System Manager . - Asynchronous mirroring - What do I need to know before creating a mirrored pair?
Your storage array must contain at least one mirror consistency group. - 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 4 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?
You see more than one reserved capacity candidate when System Manager detects more than one volume in a pool or volume group that meets the capacity percentage amount you selected for the storage object. - 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. To display the remote storage array data, launch ThinkSystem System Manager from ThinkSystem SAN Manager . - 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, System Manager displays a list of all the eligible volumes for that mirrored pair. Any volumes that are not eligible to be used do not display in that list. - 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, System Manager displays a list of all the eligible volumes for that mirrored pair. Any volumes that are not eligible to be used, do not display in that list. - 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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