Cannot add partition back to RAID 1
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I run an mdadm RAID 1 on my Raspberry Pi. The USB cables to the two hard disks (especially to /dev/sda) seem to provide somewhat loose connections or someone touches them. They are right next to the router and not in a box, so people sometimes touch stuff there. Up until now, I simply ran
sudo mdadm --manage /dev/md0 --add /dev/sda1
when that happened and the RAID rebuilt.
However, now /dev/sdb1 was removed from the RAID:
$ cat /proc/mdstat
Personalities : [raid1]
md0 : active raid1 sda1[0](W)
1952993280 blocks super 1.2 [2/1] [U_]
bitmap: 9/15 pages [36KB], 65536KB chunk
unused devices: <none>
Running
sudo mdadm --manage /dev/md0 --add /dev/sdb1
results in this error message:
mdadm: add new device failed for /dev/sdb1 as 2: Invalid argument
What's the best way of getting the array back up?
raid mdadm software-raid raid1
asked Dec 4 at 13:05
UTF-8
1,197724
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0
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I run an mdadm RAID 1 on my Raspberry Pi. The USB cables to the two hard disks (especially to /dev/sda) seem to provide somewhat loose connections or someone touches them. They are right next to the router and not in a box, so people sometimes touch stuff there. Up until now, I simply ran
sudo mdadm --manage /dev/md0 --add /dev/sda1
when that happened and the RAID rebuilt.
However, now /dev/sdb1 was removed from the RAID:
$ cat /proc/mdstat
Personalities : [raid1]
md0 : active raid1 sda1[0](W)
1952993280 blocks super 1.2 [2/1] [U_]
bitmap: 9/15 pages [36KB], 65536KB chunk
unused devices: <none>
Running
sudo mdadm --manage /dev/md0 --add /dev/sdb1
results in this error message:
mdadm: add new device failed for /dev/sdb1 as 2: Invalid argument
What's the best way of getting the array back up?
raid mdadm software-raid raid1
asked Dec 4 at 13:05
UTF-8
1,197724
Are you sure the disk is plugged in and working? Do you see/dev/sdb1? Are there any errors showing indmesgoutput?
– Stephen Harris
Dec 4 at 13:16
Can you also show the output oflsblkandmdadm --detail /dev/md0?
– Valentin Bajrami
Dec 4 at 13:32
@StephenHarrislsblklists the device and the partition but there are errors indmesg: pastebin.com/tFpJg0Mi Thank you for your help! I guess my hard drive is failing and I'll try to find out more. Apparently, it's notmdadm's fault. Its error message is just really not useful.
– UTF-8
Dec 4 at 14:01
@ValentinBajrami I'm not sure whether this is still relevant as we just figured out that one of the disks is failing. However, here are the outputs: pastebin.com/MN32uqJF pastebin.com/Qpg0zUzr
– UTF-8
Dec 4 at 14:02
@UTF-8 I would check the USB connections are good and that the drive is getting good power. I've seen external disks report I/O errors when the cable wasn't properly plugged in or when a USB-powered disk used the wrong USB cable. For an externally powered disk, ensure the power supply is properly plugged in and turned on :-)
– Stephen Harris
Dec 4 at 14:24
|
show 2 more comments
up vote
0
down vote
favorite
up vote
0
down vote
favorite
I run an mdadm RAID 1 on my Raspberry Pi. The USB cables to the two hard disks (especially to /dev/sda) seem to provide somewhat loose connections or someone touches them. They are right next to the router and not in a box, so people sometimes touch stuff there. Up until now, I simply ran
sudo mdadm --manage /dev/md0 --add /dev/sda1
when that happened and the RAID rebuilt.
However, now /dev/sdb1 was removed from the RAID:
$ cat /proc/mdstat
Personalities : [raid1]
md0 : active raid1 sda1[0](W)
1952993280 blocks super 1.2 [2/1] [U_]
bitmap: 9/15 pages [36KB], 65536KB chunk
unused devices: <none>
Running
sudo mdadm --manage /dev/md0 --add /dev/sdb1
results in this error message:
mdadm: add new device failed for /dev/sdb1 as 2: Invalid argument
What's the best way of getting the array back up?
raid mdadm software-raid raid1
asked Dec 4 at 13:05
UTF-8
1,197724
I run an mdadm RAID 1 on my Raspberry Pi. The USB cables to the two hard disks (especially to /dev/sda) seem to provide somewhat loose connections or someone touches them. They are right next to the router and not in a box, so people sometimes touch stuff there. Up until now, I simply ran
sudo mdadm --manage /dev/md0 --add /dev/sda1
when that happened and the RAID rebuilt.
However, now /dev/sdb1 was removed from the RAID:
$ cat /proc/mdstat
Personalities : [raid1]
md0 : active raid1 sda1[0](W)
1952993280 blocks super 1.2 [2/1] [U_]
bitmap: 9/15 pages [36KB], 65536KB chunk
unused devices: <none>
Running
sudo mdadm --manage /dev/md0 --add /dev/sdb1
results in this error message:
mdadm: add new device failed for /dev/sdb1 as 2: Invalid argument
What's the best way of getting the array back up?
raid mdadm software-raid raid1
raid mdadm software-raid raid1
asked Dec 4 at 13:05
UTF-8
1,197724
asked Dec 4 at 13:05
UTF-8
1,197724
asked Dec 4 at 13:05
UTF-8
1,197724
asked Dec 4 at 13:05
UTF-8
1,197724
asked Dec 4 at 13:05
UTF-8
1,197724
1,197724
Are you sure the disk is plugged in and working? Do you see/dev/sdb1? Are there any errors showing indmesgoutput?
– Stephen Harris
Dec 4 at 13:16
Can you also show the output oflsblkandmdadm --detail /dev/md0?
– Valentin Bajrami
Dec 4 at 13:32
@StephenHarrislsblklists the device and the partition but there are errors indmesg: pastebin.com/tFpJg0Mi Thank you for your help! I guess my hard drive is failing and I'll try to find out more. Apparently, it's notmdadm's fault. Its error message is just really not useful.
– UTF-8
Dec 4 at 14:01
@ValentinBajrami I'm not sure whether this is still relevant as we just figured out that one of the disks is failing. However, here are the outputs: pastebin.com/MN32uqJF pastebin.com/Qpg0zUzr
– UTF-8
Dec 4 at 14:02
@UTF-8 I would check the USB connections are good and that the drive is getting good power. I've seen external disks report I/O errors when the cable wasn't properly plugged in or when a USB-powered disk used the wrong USB cable. For an externally powered disk, ensure the power supply is properly plugged in and turned on :-)
– Stephen Harris
Dec 4 at 14:24
|
show 2 more comments
Are you sure the disk is plugged in and working? Do you see/dev/sdb1? Are there any errors showing indmesgoutput?
– Stephen Harris
Dec 4 at 13:16
Can you also show the output oflsblkandmdadm --detail /dev/md0?
– Valentin Bajrami
Dec 4 at 13:32
@StephenHarrislsblklists the device and the partition but there are errors indmesg: pastebin.com/tFpJg0Mi Thank you for your help! I guess my hard drive is failing and I'll try to find out more. Apparently, it's notmdadm's fault. Its error message is just really not useful.
– UTF-8
Dec 4 at 14:01
@ValentinBajrami I'm not sure whether this is still relevant as we just figured out that one of the disks is failing. However, here are the outputs: pastebin.com/MN32uqJF pastebin.com/Qpg0zUzr
– UTF-8
Dec 4 at 14:02
@UTF-8 I would check the USB connections are good and that the drive is getting good power. I've seen external disks report I/O errors when the cable wasn't properly plugged in or when a USB-powered disk used the wrong USB cable. For an externally powered disk, ensure the power supply is properly plugged in and turned on :-)
– Stephen Harris
Dec 4 at 14:24
Are you sure the disk is plugged in and working? Do you see
/dev/sdb1? Are there any errors showing in dmesg output?– Stephen Harris
Dec 4 at 13:16
Are you sure the disk is plugged in and working? Do you see
/dev/sdb1? Are there any errors showing in dmesg output?– Stephen Harris
Dec 4 at 13:16
Can you also show the output of
lsblk and mdadm --detail /dev/md0 ?– Valentin Bajrami
Dec 4 at 13:32
Can you also show the output of
lsblk and mdadm --detail /dev/md0 ?– Valentin Bajrami
Dec 4 at 13:32
@StephenHarris
lsblk lists the device and the partition but there are errors in dmesg: pastebin.com/tFpJg0Mi Thank you for your help! I guess my hard drive is failing and I'll try to find out more. Apparently, it's not mdadm's fault. Its error message is just really not useful.– UTF-8
Dec 4 at 14:01
@StephenHarris
lsblk lists the device and the partition but there are errors in dmesg: pastebin.com/tFpJg0Mi Thank you for your help! I guess my hard drive is failing and I'll try to find out more. Apparently, it's not mdadm's fault. Its error message is just really not useful.– UTF-8
Dec 4 at 14:01
@ValentinBajrami I'm not sure whether this is still relevant as we just figured out that one of the disks is failing. However, here are the outputs: pastebin.com/MN32uqJF pastebin.com/Qpg0zUzr
– UTF-8
Dec 4 at 14:02
@ValentinBajrami I'm not sure whether this is still relevant as we just figured out that one of the disks is failing. However, here are the outputs: pastebin.com/MN32uqJF pastebin.com/Qpg0zUzr
– UTF-8
Dec 4 at 14:02
@UTF-8 I would check the USB connections are good and that the drive is getting good power. I've seen external disks report I/O errors when the cable wasn't properly plugged in or when a USB-powered disk used the wrong USB cable. For an externally powered disk, ensure the power supply is properly plugged in and turned on :-)
– Stephen Harris
Dec 4 at 14:24
@UTF-8 I would check the USB connections are good and that the drive is getting good power. I've seen external disks report I/O errors when the cable wasn't properly plugged in or when a USB-powered disk used the wrong USB cable. For an externally powered disk, ensure the power supply is properly plugged in and turned on :-)
– Stephen Harris
Dec 4 at 14:24
|
show 2 more comments
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Are you sure the disk is plugged in and working? Do you see
/dev/sdb1? Are there any errors showing indmesgoutput?– Stephen Harris
Dec 4 at 13:16
Can you also show the output of
lsblkandmdadm --detail /dev/md0?– Valentin Bajrami
Dec 4 at 13:32
@StephenHarris
lsblklists the device and the partition but there are errors indmesg: pastebin.com/tFpJg0Mi Thank you for your help! I guess my hard drive is failing and I'll try to find out more. Apparently, it's notmdadm's fault. Its error message is just really not useful.– UTF-8
Dec 4 at 14:01
@ValentinBajrami I'm not sure whether this is still relevant as we just figured out that one of the disks is failing. However, here are the outputs: pastebin.com/MN32uqJF pastebin.com/Qpg0zUzr
– UTF-8
Dec 4 at 14:02
@UTF-8 I would check the USB connections are good and that the drive is getting good power. I've seen external disks report I/O errors when the cable wasn't properly plugged in or when a USB-powered disk used the wrong USB cable. For an externally powered disk, ensure the power supply is properly plugged in and turned on :-)
– Stephen Harris
Dec 4 at 14:24