This help page provides information to guide you through a procedure called auto migration. This procedure is part of the procedure to replace a failed array with a new one. This help page contains the following topics:
Auto Migration is a function that copies both user data and system information from one Simple Modular Storage 100 array (the source array) to another (the target array). It is normally used when replacing a array that has a failure which requires the entire array to be replaced with a new array. Auto migration provides a simple way to migrate the data from the failed array to the new one. The procedure includes connecting the source array directly to the target array, and then starting and monitoring the process with Navigator 2. When the auto migration process is complete, you can access the target array in the same way as you did the source array.
Before starting the auto migration process, complete and/or verify the following items:
The source and target arrays must have the same number of controllers (1 or 2).
Connect the two arrays directly to each other with special migration cables that are supplied with all replacement arrays. The cables connect the controller(s) in the source array to the controller(s) in the target array. When the arrays are connected by migration cables, the target array can be detected and controlled by the source array .If the arrays each have only one controller, only one cable is required to connect the two arrays. If the arrays have two controllers, two cables are required.
The target array must contain the same or greater total disk capacity as the source array has.
Both arrays must be connected to the LAN as well as directly to each other via the migration cables.
Both the source and target arrays must be running the same version of the microcode (firmware). The microcode version is displayed in the Array List window to the right of the name of each array.
Complete the following steps to connect the two arrays directly together.
Install the target array. Ensure that the power supplies are on (the fans are running) but do not turn the main power switch on at this time.
Turn the power OFF on the source array. Note that the array power takes a minute or two to shut down. Check the lights on the front of the array and wait until they are off before continuing to step 3. The power supplies and fans continue to run.
Connect the migration cable(s) from the source array to the target array. If the arrays have one controller, connect the migration cable from the lower auto migration port (labeled EXT PORT) on the source array to the lower auto migration port (labeled EXT PORT) on the target array. See the illustration below and also the illustrations in the Auto Migration Assistant Guide which is shipped with the new array. If the arrays have two controllers, connect the first cable as described above, and then connect the second migration cable from the upper auto migration port (labeled EXT PORT) on the source array to the upper auto migration port (labeled EXT PORT) on the target array.
On the back of the target array, find the MODE switch (it is just to the right of the power switch) and move it from the N (left - normal) to the E (right - migration Enabled) position. See the following illustration. The MODE switch is recessed to prevent accidental switching and it requires a pen or a small piece of stiff wire such a paper clip to change the position of the switch.
Turn the power back on both arrays and wait for them to boot. This usually takes about four minutes but could take longer.
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NOTE: When booting is complete, the Ready light will be illuminated on the source array but not on the target array. This is because the Ready light indicates ready for normal operation. |
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NOTE: Before starting the migration process, ensure that all of the prerequisites listed above have been completed. |
Auto Migration consists of three steps:
Connect New Array - logically connect the target array to the source array..
Create Copy - copy the user and system data from the source array to the target array.
Switch Array - disconnect the source array from Navigator 2 and connect the target array in its place.
These procedures are described in detail below.
In the Array List window:
Add the target array to Navigator 2. If needed, see the help page for the Add Array wizard.
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NOTE: The target array will have a question mark instead of a checkmark in the status column because the migration switch is set to the migration position. This does not mean that the array is unavailable as it would if the migration switch were in the normal position. See the following illustration. |
Click the name of the source array (or click the next to its name and click Show and Configure Array.) The Array window and settings tree is displayed.
In the Array settings tree, select Settings > Replacement of Array > Auto Migration. The Auto Migration window is displayed. The window contains the following data fields and controls needed to execute auto migration.
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Item |
Description |
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Summary Area (provides status of listed items) |
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Migration Status |
This field displays the current phase of the migration process. Status messages that cam be displayed are:Not started, Connecting to New Array Failed, and New Array Connected |
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Progress |
The progress of copy creation. A value is displayed only when the Migration Status is Creating Copy. |
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Copy Pace |
This function sets the copying speed for user data from the source array to the target array. I/Os from hosts are prioritized if specified Slow. Copy is prioritized if specified Fast. The default is Slow. |
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Error |
This field displays the cause of the failure if auto migration fails. Errors can be Array cannot be detected |
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Migration Flow Area |
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Connect New Array |
This command logically connects the target (new) array to the source (failed) array. |
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Create Copy |
This command copies user and system data from the failed array to the new one. |
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Switch Array |
This command changes the host access from the source (failed) array to the target array. |
Click Connect New Array. This causes the failed array to detect the target array. The Connect New Array dialog box is displayed. The process can take two to three minutes.
When the new array is connected or timeout is reached, a completion message is displayed in the dialog box. Click Close to exit the dialog box and return to the Auto Migration window.
In the Summary area of the window, verify that the Migration Status indicates New Array Connected. This shows that the source array has successfully detected the target array.
The Create Copy function copies user and system data from the failed array to the new one. Complete the steps below to copy the data.
In the Auto Migration window, click Create Copy The Create Copy dialog box is displayed. The dialog box includes several statements that explain the process and includes a warning.
To begin copying, click the confirming that you understand the warning, and then click Confirm. The dialog box closes and he copying process starts. The time it takes to complete the copying varies from minutes to hours depending on how much data is contained in the source array.
Do not stop the copying process once it has started.
After copying is completed, Navigator 2 displays a message in the Auto Migration window that copying has completed successfully.
During the Checking, Preparing to Create Copy, and Create Copy operations, you can change the priority of the copying process. The higher the priority, the faster the data is copied, but the slower the host I/Os are.
To change the copy priority:
Click Change Copy Pace. The Change Copy Pace dialog box is displayed. Three copying priorities are available:
High (copying has priority and host I/Os may be slow.
Medium (copying and host I/Os have equal priority)
Low (host I/Os have priority and copying may be slow)
Select the desired copy priority and click OK.
The Switch Array function changes the host access from the failed array to the target array.
Stop all I/Os from the host(s) to both the source and target arrays. This is necessary because the switch array process reboots the failed array and starts up the target array.
In the Auto Migration window, click Switch Array. The Switch Array dialog box is displayed.
In the dialog box, select the Controller 0 tab.
Set the network settings for Controller 0 in the target array and the source array. The normally settings is network settings in the target array to match the network settings in source array.
If the array has only one controller, skip steps 6 and 7 and continue with step 8. Otherwise, continue below.
Select the Controller 1 tab.
Set the network settings for Controller 0 in the target array and the source array. The normal setting is to have the network settings in the target array match the network settings in source array. If the migration includes and upgrade to two controllers, you can only configure the network settings for the target array only.
Set the network settings for Controller 1 in the target array to match the network settings of controller 1 in the source array.
Check the I/O access to the failed array and verify that they are stopped.
Click the labeled Yes, I have stopped the host accesses to the array..
Click Confirm to continue. A dialog box is displayed while the source array is being rebooted.
When the Switch Array process is complete, a message box is displayed stating that switching arrays has completed and that you should turn off power and disconnect the migration cables. Click Close to exit the dialog box.
Complete the Replacement of Array procedure as described in the help page Replacing an Array.
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NOTE: To complete the process of replacing an array, see the section title Completing the Array Replacement Process in the Replacing an Array help page. |
See Also (back to top)
The following topics within this online help provide information that may be helpful in understanding the information on this page, and/or may provide additional information that is related, but not required to understand this topic.
