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Hi, I recently did a complete update, and now I really wish I could go back as I can't get the new kernel to boot properly, but anyway. After rebooting I was greeted with "mdadm /dev/md0 started with 1 drive (of 2)"
This particular volume is just one partition across 2 drives and it operates as `/` with RAID 1. I have GRUB entries to boot from either drive(in case one fails). Both of these work, so I'm not really seeing any true failure. However, I definitely do not want them to get out of sync or anything.
[earlz@EarlzZeta ~]$ sudo mdadm --detail /dev/md0
/dev/md0:
Version : 0.90
Creation Time : Thu Jun 23 09:17:58 2011
Raid Level : raid1
Array Size : 96256 (94.02 MiB 98.57 MB)
Used Dev Size : 96256 (94.02 MiB 98.57 MB)
Raid Devices : 2
Total Devices : 1
Preferred Minor : 0
Persistence : Superblock is persistent
Update Time : Wed Oct 3 17:06:19 2012
State : clean, degraded
Active Devices : 1
Working Devices : 1
Failed Devices : 0
Spare Devices : 0
UUID : 66683e43:f27e50e8:52419904:51489ef3
Events : 0.70
Number Major Minor RaidDevice State
0 0 0 0 removed
1 8 17 1 active sync /dev/sdb1
What's the safest way to go about getting this volume back up with both drives?
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You need to do one of two things (I've been meaning to post about this since I figured it out myself):
1] Remove it and add it back. For example:
# /sbin/mdadm /dev/md0 --fail /dev/sda5 --remove /dev/sda5
# /sbin/mdadm /dev/md0 --add /dev/sda5
2] That didn't work for me, as it said that the device wasn't part of an array. I just had to add it back:
# mdadm --manage /dev/md0 --add /dev/sda5
Of course, you would replace the 'md0' and /dev/sda5 with the correct mappings for your setup, maybe /dev/sda1
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You might use smartmontools to check to see that the drive(s) aren't failing.
I may have to CONSOLE you about your usage of ridiculously easy graphical interfaces...
Look ma, no mouse.
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