RAID1: Urgent.. Two disks out of sync... how to get them back in sync?
Hello. I have a very simple RAID1 system.
Two identical disks sda and sdb, identical partitions on both.
The raid apparently degraded some time ago, and the system kept using /dev/sdb only.
After an fsck, the system booted from /dev/sda..
So, the system went back in time by several months!
I rescued /dev/sdb.. How can I copy stuff from each /dev/sdb partition to /dev/sda?
My intention is to boot from flash, and do a cp -pR from each /dev/sdb partition to its equivalent /dev/sda partition.
Once I collect as much data as possible, I intend to remove sdb to replace it with another drive.
Does that sound good?
You don't want to copy files as that wont fix the RAID flags.
Option 1 both drives in the same place but you can boot sdb
1. You need to boot the system from /dev/sdb
2. You need to check that your running a degraded RAID with only /dev/sdb working
3. You then add /dev/sda back with mdadm --re-add
Option 2 swap the drives so the sdb is sda and boots from there
Similar to option 1 but you swap sda for sdb
re-sync should then be in progress and you can get an indication of the time to completion from /proc/mdstat
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