Hi all, The default CentOS 6 install media creates md devices with metadata 1.1 (or, it seems like, 1.0 for /boot). I was wondering, first off, is there any advantage to try to attempt to migrate these to metadata 1.2? I suppose that RHEL/CentOS had some reason for making /boot 1.0 (perhaps the newer metadata formats can not be booted), so for now let's just consider migrating from 1.1 to 1.2. If there are any advantages, what would they be? And would it generally be a big advantage or a relatively minor one? If there actually is a significant advantage to migrate to 1.2, is the general process to do so basically the same as what Neil wrote last year? http://marc.info/?l=linux-raid&m=130895284716309 If it helps any, my mdadm and uname for one example is below. As you can see the md devices are made from partitions--the CentOS installer doesn't easily support a RAID1 on the entire boot drive. I'm not tied to any of the data on these arrays, but an in-place migration (even if single-user is needed e.g. to operate on /usr) would be easier. --keith # mdadm -D /dev/md3 /dev/md3: Version : 1.1 Creation Time : Wed Oct 10 14:59:54 2012 Raid Level : raid1 Array Size : 20478908 (19.53 GiB 20.97 GB) Used Dev Size : 20478908 (19.53 GiB 20.97 GB) Raid Devices : 2 Total Devices : 2 Persistence : Superblock is persistent Intent Bitmap : Internal Update Time : Mon Oct 15 11:41:13 2012 State : active Active Devices : 2 Working Devices : 2 Failed Devices : 0 Spare Devices : 0 Name : XXXXX UUID : 741b351c:dd186205:745aa46b:0331a8ff Events : 82 Number Major Minor RaidDevice State 0 8 3 0 active sync /dev/sda3 1 8 19 1 active sync /dev/sdb3 # uname -a Linux XXXXXX 2.6.32-279.9.1.el6.x86_64 #1 SMP Tue Sep 25 21:43:11 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux -- kkeller@xxxxxxxxxxxxxxxxxxxxxxxxxx -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
