I am trying to figure out which of my RAID devices is considered home. I haven't switched machines, but I have several operating systems, with different hostnames, on the machine. 0.90 format metadata. Even 2 RAID devices created on the same OS don't seem to have any UUID in common. i thought that the end of the UUID's would be the same. For example, inhttp://marc.info/?l=linux-raid&m=123999237229707 Neil Brown says > Note that 0.90 metadata does contain homehost information to some > extent. When homehost is set, the last few bytes of the uuid is set > from a hash of the homehost name. That makes it possible to test if a > 0.90 array was created for 'this' host, but not to find out what host > it was created for. mdadm.conf has HOMEHOST <system> The 2 UUIDS are 8691ad98:af955756:ae5efbfa:dfd20ce6 6d89d3b5:19a0acce:319e1a9c:58606385 Thanks, Ross Boylan Details: root@wheezy4:~# mdadm --detail /dev/md7 /dev/md7: Version : 0.90 Creation Time : Fri Oct 3 17:20:13 2014 Raid Level : raid1 Array Size : 48828352 (46.57 GiB 50.00 GB) Used Dev Size : 48828352 (46.57 GiB 50.00 GB) Raid Devices : 1 Total Devices : 1 Preferred Minor : 7 Persistence : Superblock is persistent Update Time : Tue Nov 4 17:48:40 2014 State : clean Active Devices : 1 Working Devices : 1 Failed Devices : 0 Spare Devices : 0 UUID : 8691ad98:af955756:ae5efbfa:dfd20ce6 Events : 0.1 Number Major Minor RaidDevice State 0 8 20 0 active sync /dev/sdb4 root@wheezy4:~# mdadm --detail /dev/md8 /dev/md8: Version : 0.90 Creation Time : Tue Sep 30 13:27:56 2014 Raid Level : raid1 Array Size : 970702784 (925.73 GiB 994.00 GB) Used Dev Size : 970702784 (925.73 GiB 994.00 GB) Raid Devices : 2 Total Devices : 1 Preferred Minor : 8 Persistence : Superblock is persistent Update Time : Mon Nov 10 18:16:11 2014 State : clean, degraded Active Devices : 1 Working Devices : 1 Failed Devices : 0 Spare Devices : 0 UUID : 6d89d3b5:19a0acce:319e1a9c:58606385 Events : 0.790792 Number Major Minor RaidDevice State 0 8 19 0 active sync /dev/sdb3 1 0 0 1 removed -- 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
