On Fri, Dec 21, 2018 at 06:13:26AM +0100, Simon Matter via CentOS wrote:
I didn't see any issues with RAID. I think those problems arise only if you have old RAID devices created with older CentOS releases than 7. Those were probably created with 0.9 metadata version which may be a problem. Currently 1.2 metadata version is created and I didn't see any issues with it.
I just took a look at the md devices in my raid1, and it seems pretty weird. they were all created by the installer (Anaconda) when I first installed C7, yet 3 of them are 1.2 and one is 1.0.
# mdadm --detail /dev/md124 /dev/md124: Version : 1.2 Creation Time : Wed Dec 2 23:13:09 2015
# mdadm --detail /dev/md125 /dev/md125: Version : 1.2 Creation Time : Wed Dec 2 23:13:21 2015
# mdadm -D /dev/md126 /dev/md126: Version : 1.2 Creation Time : Wed Dec 2 23:13:22 2015
# mdadm -D /dev/md127 /dev/md127: Version : 1.0 Creation Time : Wed Dec 2 23:13:18 2015