deloptes <delop...@gmail.com> writes: > Hi, > I noticed recently by accident that when I read/write from the oldest raid > disks I have - only one of the tray leds blinks. Of course the led could be > damaged, but rather not, so looking into it I found that both disks in > question return same UUID. So I am concerned now that I don't have any true > RAID there and that there is very important data on those disks. > > How is this possible and how to solve it - I would simply add 3rd 500MB disk > to the raid and remove one of the others, but still what is the impact of > this (stupid) coincidence ... > > # blkid /dev/sdf > /dev/sdf: PTUUID="13e17ac7" PTTYPE="dos" > ^^^^^^^^ > # blkid /dev/sdg > /dev/sdg: PTUUID="13e17ac7" PTTYPE="dos" > ^^^^^^^^ > # blkid /dev/sda > /dev/sda: PTUUID="4184002e" PTTYPE="dos" > # blkid /dev/sdb > /dev/sdb: PTUUID="9570a766" PTTYPE="dos" > # blkid /dev/sdd > /dev/sdd: PTUUID="d898a14c" PTTYPE="dos" > # blkid /dev/sde > /dev/sde: PTUUID="b6346d5e" PTTYPE="dos" > > > # blkid /dev/sdf1 > /dev/sdf1: UUID="5427071b-25c8-fff8-476d-ff8c9852b714" > TYPE="linux_raid_member" PARTUUID="13e17ac7-01" > # blkid /dev/sdg1 > /dev/sdg1: UUID="5427071b-25c8-fff8-476d-ff8c9852b714" > TYPE="linux_raid_member" PARTUUID="13e17ac7-01"
This is normal. It's the identical UUIDs that tell the system that the partitions go into the same RAID array. Here's what I see when I look at my RAID disks: /dev/sda2: UUID="67d3c233-96a0-737c-5f88-ed9b936ea3ae" UUID_SUB="48b56869-6f19-21b9-283f-3eee3ac90cf8" LABEL="snowball:1" TYPE="linux_raid_member" PARTUUID="3bb3729a-528b-4384-b6a5-b6d9e148ed2a" /dev/sdb2: UUID="67d3c233-96a0-737c-5f88-ed9b936ea3ae" UUID_SUB="1f48f805-4173-78cd-1f52-957920f66335" LABEL="snowball:1" TYPE="linux_raid_member" PARTUUID="1bdd3893-9346-49d2-8292-a61075ad0c5e" and here's the relevant line in my /etc/mdadm/mdadm.conf ARRAY /dev/md/1 metadata=1.2 UUID=67d3c233:96a0737c:5f88ed9b:936ea3ae name=snowball:1 But... if this data is that important, you should be running backups. RAID is to keep you running if a disk fails, it isn't to keep you from losing data.
