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We have a Windows Server 2008 with mirrored disks (RAID 1). Disk 0 & Disk 1. Last week, Disk 0 failed so we replaced that with new one. Completed mirroring from Disk 1 to Disk 0 using Diskpart. However, today when we rebooted the server, we realized that we can't boot from disk 0. We can boot only from disk 1.

The server is up and running but how to make disk 0 bootable ?

Thanks in advance for your help.


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What do you mean by "boot from primary drive" ? Isn't a mirror just "one drive" for the OS? Or are you pulling out the secondary and it does not boot anymore? – MichelZ Jul 4 '14 at 6:32
Like MichelZ I'm not sure to understand your question. If one of your RAID1 disk has been replaced and then sync with the remaining disk things should be OK. However you can maybe take a look at your RAID conf or in your bios to check which disk is selected. – NooJ Jul 4 '14 at 7:29
I suspect what you mean is that you had 2 disks in a software mirror and you replaced the first disk and now you can only boot from the secondary plex, is that correct? – joeqwerty Jul 4 '14 at 15:48
Joeqwerty, Yes. Sorry for being unclear. – Atul Jul 7 '14 at 3:47

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