Thread: mdadm and blkid disagree on what the UUID of my array is...

i have 3-component raid5 array, composed of: /dev/sd[abc]1. mdadm tells me uuid array *different* blkid says is.

code:

root@lwobker-fs:~# mdadm --examine /dev/sd[abc]1 | egrep 'uuid|dev' /dev/sda1:      array uuid : f82a311d:93d4f3a1:cd359611:8b50ce19     device uuid : e0b77465:531d19cd:e5609b47:326babe8    device role : active device 0 /dev/sdb1:      array uuid : f82a311d:93d4f3a1:cd359611:8b50ce19     device uuid : 2c1050e8:eb321107:f37b8b8a:b9fc56d2    device role : active device 1 /dev/sdc1:      array uuid : f82a311d:93d4f3a1:cd359611:8b50ce19     device uuid : f4035780:5bd340e6:21d9468d:f944050b    device role : active device 2

but blkid thinks it's different:

code:

/dev/sda1: uuid="f82a311d-93d4-f3a1-cd35-96118b50ce19" label="lwobker-fs:0" type="linux_raid_member" /dev/sdb1: uuid="f82a311d-93d4-f3a1-cd35-96118b50ce19" label="lwobker-fs:0" type="linux_raid_member" /dev/sdc1: uuid="f82a311d-93d4-f3a1-cd35-96118b50ce19" label="lwobker-fs:0" type="linux_raid_member" /dev/sdd1: uuid="cdf5d475-37c7-48d9-b6a1-5564702e3ccf" type="ext4" /dev/sdd5: uuid="9a5ba558-3a80-4248-9a08-3178d42b50dc" type="swap" /dev/md0: uuid="ceeef66c-0caa-4127-a1a2-01de1738da1b" type="ext4"

my understanding within md superblock "array uuid" same blkid reports... ideas here on might missing? have expected see unique id's each device (which do) , common id array (which do) -- difference between array uuid , blkid sees coming from?

kinda old, i'll contribute anyway: raid array uuid 1 copied around devices raid composed. you'll notice blkid shows uuid of sda1,2,3 being same - that's raid array uuid.

uuid you're seeing on /dev/md0 ext4 file system uuid installed on top of array. more shown if had fdisk'd array , partitioned md0p1 , md0p2, , put file systems on top of both partitions. you'd have unique uuid's both partitions - these uuid's belong filesystem, not array.

Forum The Ubuntu Forum Community Ubuntu Official Flavours Support Installation & Upgrades [ubuntu] mdadm and blkid disagree on what the UUID of my array is...

Ubuntu