On Fri, Jun 01, 2012 at 16:03:37 -0700, "H. Peter Anvin" <hpa@xxxxxxxxx> wrote:
1. The user doesn't trust you at all, and physically disconnects a RAID member from the set before allowing Anaconda to touch the disk. Anaconda will not see the disk because it is not there to be seen. 2. The user knows he wants to add redundancy later, or intends to run single disk but wants seamless transition to new hardware when needed (+Brendan Conoboy's scenario.) 3. The user wants to break the RAID in software during installation. This eliminates the need to crack the case, but assumes one trusts the software to not screw it up. This does have some nice features, but definitely requires a lot of UI work in order to prevent mistakes.
None of those cases requires installing to a degraded array. You can change the array to not be degraded before doing the install. (This assumes you are talking about pulling one disk from a software raid 1 array.) I am not sure what the limitations are for install to raid 1 arrays with only one element are these days. I think the way it used to work, is that you couldn't create such an array in the installed, but you could use one if it was already set up.
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