On Tue, Nov 27, 2012 at 10:24:45AM -0500, Gene Poole wrote:

What's the odds of retaining the data in a software raid-1 array when falling back to CentOS 5.8 x86_64 from CentOS 6.3 x86_64? The array is made up of 2 - 1.5 TB hard disks. The original array was defined under CentOS 5.3 x86_64, then CentOS 6.1 x86_64 was installed and over time upgraded to CentOS 6.3. I need to back-level to test some software not certified for CentOS/RHEL 6.

I have no experience doing that, so this is a form of talking thru my hat, so YMMV.

It may be safest to put your raid drives aside for the moment and do a fresh 5.x install on a different drive (or drive pair, if you insist on RAID) for testing purposes, then when done reinsert your 6.x drives.

If it must be done on that machine, then I'd suggest either using dd to copy one or both drives of the raid pair to another drive (or pair), or at least using dd to take images of both drives (which are, needless to say, stored offline somewhere) so you can restore them to their original condition after testing.

At Tue, 27 Nov 2012 10:24:45 -0500 CentOS mailing list centos@centos.org wrote:

What's the odds of retaining the data in a software raid-1 array when falling back to CentOS 5.8 x86_64 from CentOS 6.3 x86_64? The array is made up of 2 - 1.5 TB hard disks. The original array was defined under CentOS 5.3 x86_64, then CentOS 6.1 x86_64 was installed and over time upgraded to CentOS 6.3. I need to back-level to test some software not certified for CentOS/RHEL 6.

If you didn't do something like rebuild the raid array when you installed CentOS 6.3, the raid array will just plain work.

I'm going to assume that the raid array is a separate data file system from the operating system, i.e. the root file system is on a different file system. This makes things very easy.

Thanks, Gene Poole _______________________________________________ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos