Ubuntu – Tell ubuntu to ignore dead hard drive during booting

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How can I tell Ubuntu to ignore my dead hard drive during booting?

I know my secondary hard drive is bad, but I cannot take it out. Every Reboot takes forever because Ubuntu tries to read from it for a long time and reports errors:

[  228.984480] sd 0:0:1:0: [sdb] Add. Sense: 
               Unrecovered read error - auto reallocate failed
[  228.984486] end_request: I/O error, dev sdb, sector 65
[  228.985395] Buffer I/O error on device sdb, logical block 8
[  228.985463] Buffer I/O error on device sdb, logical block 9
...

I commented it out in /etc/fstab, but that doesn't help. Any ideas? Thanks!

Best Answer

Disable it in the BIOS?

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That's definitely a hardware problem. If it happens on just one or a few disks, the disk is likely to be stuffed. If it happens on a number of different disks, then it's the drive.

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You shouldn't attempt to prepare the new drive in any meaningful way unless your raid constituents are actually disk PARTITIONS not disks themselves. In which case, you would create a partition on the new drive that is the same size as the one on the remaining active disk.

You never need to touch the old drive at all -- it's assumed to be failed and unreliable.

The correct procedure is to remove the broken drive, add a new, empty drive, and then use mdadm to add that new drive to the array. You'd do it something like this:

mdadm --add /dev/md0 /dev/<newdrive>

The kernel will then sync the new drive into the array, copying the data from the one remaining good drive.

Best Answer

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