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Talking about RAID - disks with same id




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"


# smartctl -i /dev/sdf
smartctl 6.6 2016-05-31 r4324 [x86_64-linux-4.12.10] (local build)
Copyright (C) 2002-16, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF INFORMATION SECTION ===
Model Family:     Western Digital Caviar Blue (SATA)
Device Model:     WDC WD5000AAKS-00A7B0
Serial Number:    WD-WMASY0076274
LU WWN Device Id: 5 0014ee 055d4abcc
Firmware Version: 01.03B01
User Capacity:    500,107,862,016 bytes [500 GB]
Sector Size:      512 bytes logical/physical
Device is:        In smartctl database [for details use: -P show]
ATA Version is:   ATA8-ACS (minor revision not indicated)
SATA Version is:  SATA 2.5, 3.0 Gb/s
Local Time is:    Wed Nov  8 22:30:10 2017 CET
SMART support is: Available - device has SMART capability.
SMART support is: Enabled

# smartctl -i /dev/sdg
smartctl 6.6 2016-05-31 r4324 [x86_64-linux-4.12.10] (local build)
Copyright (C) 2002-16, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF INFORMATION SECTION ===
Model Family:     Seagate Barracuda 7200.10
Device Model:     ST3500630AS
Serial Number:    9QG87WTQ
Firmware Version: 3.AAK
User Capacity:    500,107,862,016 bytes [500 GB]
Sector Size:      512 bytes logical/physical
Device is:        In smartctl database [for details use: -P show]
ATA Version is:   ATA/ATAPI-7 (minor revision not indicated)
Local Time is:    Wed Nov  8 22:30:12 2017 CET
SMART support is: Available - device has SMART capability.
SMART support is: Enabled