-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 First, you should have backups. Why not get an external USB drive? You can get those quite inexpensive. Heck, even a 64GB thumb drive shouldn't be too expensive, though flash is not the most reliable. No matter what, I would start with a good backup. Playing with mdadm is relatively safe, but if it's your first time playing with it, you can get yourself into trouble. Hardware RAID controllers often auto-use replacement drives to rebuild a degraded array, but mdadm does not. How exactly you go about repairing the array depends on your specific configuration and which drive failed. You will need to start by partitioning the replacement drive such that it matches the existing drives (each array has to have a partition equal to or larger than the same partitions on the other drives). Once partitioned (and rebooted, if needed), you will add the new partition to the degraded array. Once added, mdadm will start re-assembling the array. Note that if one of the arrays has /boot, you'll probably need to run grub's install on the raw disk so that it can be booted from. The command to add the new partition to an existing array will look something like this: mdadm --manage /dev/md0 --add /dev/sda1 Obviously, the 'mdX' and 'sdYZ' will need to be adjusted for your configuration. digimer On 17/02/15 04:42 PM, o1bigtenor wrote:
Greetings
I have been running a raid 10 array for almost 3 years.
Last September on a reboot (forced by Firefox and kernel memory interaction problems) came up with one of the drives being listed as DOA. The raid array has continued to run on 3 drives although on reboots there is much complaining from whatever in the boot up process. I had the replacement drive sent to me and today I installed the drive.
I was under the assumption that the raid array would rebuild itself upon startup with a new drive (4th out of 4).
This did not happen.
I am running Debian Jessie (testing) and have the whole time in question. I can mount the array and it is visible. I'm looking at backing up the array (on blu-ray discs) but as I'm now to circa 45 GB of data and I was at about 22 GB when I last did a backup this is going to be a momentous event.
How do I ask mdadm to include this new drive into the array? (Without borking everything!! I have found lots of instructions on how to create but none in an hour of trying different search phrases on how to rebuild or how to cause the array to rebuild itself. I have only been able to find instructions for when the array is totally sick and I'm not there (yet - - - grin!) but I don't want to wait until another drive craps out to get things going.)
TIA
Dee
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- -- Digimer Papers and Projects: https://alteeve.ca/w/ What if the cure for cancer is trapped in the mind of a person without access to education? -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAEBAgAGBQJU47mYAAoJECChztQA3mh0hM8P/0pQLC3io+BWsDV1NzUObQGp F7TjarGw6zHo4p0dn2oTPt1JoiOp6GgmZKw3qVvnPkdnfR8loI4Ikuv6S2S2UwPi 5eGgdCZIrKw8iQfuyAd1NkukuLiQeUQ45DpaCpisCoDNAnMlCECg9CZELNB2sBnF WxvSp3i4I+tMutpRri/X+mUVwkzOPWAPE8qoPUCeYFs+X4fcF0L4+LfF+0oJIIIC 4j+aRykitL9AYLZwy/tgi+W7U8wZuwxr12f6AgRLn3VyArWnE6f5Jd6TM2/qmJy0 SSBLQ/1jjWXFlHkTMs/130kRzBEmqJjkh7//lvgXdnExNXU9lQZyaW7oly08zB7V 6i8whwkrcE6cEfu/RJZi+IUj/Y4Ja2KCVb2ltTDEbHzWQ2qvq6NEPzdtceASsYvm BGkSMQqcVT6HgCLRpnbZI+Wl3DXiC9TJg9KwL7wUlxjhB0MCV3X9dFV2RR+eWQEm zFYMvuFGSVuHZ1DEywvkHSLfgfcUtNGBAYcyauIh9pDbffNFBNxkBTa87qLcJGnP ZUVBi9EDIysbAHesmV0Ku9PxA05P3RwYgNmYDU+d2mpqXCxUt1CbQ9xUR4kkDa00 71AFSl2HhROgcwYhpKHj+aScHxTiMabs2hofcz11GAMVxoS+eJazVD9Si/OE/nC5 4FAKSOEgPUa5vc5YAjLy =zt65 -----END PGP SIGNATURE-----