You must do this to make sure that the shadow drive can boot the system if disk-0 fails. Make sure that you use the correct drive letters if you used different letters for your EFI partitions.
Remove the drive letters assigned to both EFI partitions. This step is optional, because after a reboot they will not be re-assigned. Before you can establish a mirror, both the primary source drive Disk-0 and the shadow destination drive Disk-1 must be converted to Dynamic.
After the disks are Dynamic after a reboot , you can then establish the mirror. You can do this step with either the Disk Management console or the Diskpart. With Diskpart. Perform this on both the shadow and primary GPT disks. Start with the shadow disk. Shut down and restart your computer to complete the conversion of the system drive disk-0 to dynamic.
This may require two reboots. After both the primary disk-0 and shadow disk-1 drives are dynamic, you can then establish the mirror of the boot volume to the shadow drive. You can do this step with either the Disk management console or the Diskpart. Now that you have successfully established the boot mirror, a new boot entry was automatically added to NVRAM so that you can boot to the shadow drive.
This new entry is displayed as Boot Mirror C: - secondary plex on the boot menu. If you select it, it will boot into the operating system on the shadow drive. However, if something were to happen to any of the system files or the EFI partition itself on disk-0 or if disk-0 failed completely, you would have to boot from the EFI partition on disk At a command prompt, run the Bootcfg.
You have one boot entry for the main operating system boot entry id:1 , and one boot entry for the Mirror shadow drive boot entry id INFO: Boot entry whose id is '1' successfully cloned.
INFO: Boot entry whose id is '5' successfully cloned. To see the new Cloned entries added to NVRAM, use the bootcfg command and notice you now have seven entries instead of five. The bottom two entries are the cloned entries and will use the EFI partition on the shadow drive disk-1 to boot. After you have created the new boot entries in NVRAM, test the entries to make sure that the system can boot to the shadow drive if disk-0 fails.
If the original Windows operating system was software mirrored to a Dynamic GPT disk that did not contain an EFI partition, or the EFI partition becomes damaged, or if the primary system disk disk-0 fails, you may receive the following error message when you try to boot to the shadow disk:. You must now use the following procedure to recover the original operating system shadow drive. Under All available dynamic disks, click the disk in which you want to host the mirror, and then click Add.
Verify that the disks in which you want to create a mirrored volume are listed in the Selected dynamic disks box. In the Size box, specify the amount of unallocated disk space to use for the volume, and then click Next. Confirm that the options that you selected are correct, and then click Finish. The mirrored volume is created and appears in the appropriate dynamic disks in the Disk Management window.
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