[CentOS] What's The Odds?

Tue Nov 27 15:47:03 UTC 2012
fred smith <fredex at fcshome.stoneham.ma.us>

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.

---- Fred Smith -- fredex at fcshome.stoneham.ma.us -----------------------------
  "For him who is able to keep you from falling and to present you before his 
 glorious presence without fault and with great joy--to the only God our Savior
 be glory, majesty, power and authority, through Jesus Christ our Lord, before
                     all ages, now and forevermore! Amen."
----------------------------- Jude 1:24,25 (niv) -----------------------------