Ok, it's time to replace 3 disks in a 3-way mirrors on a running
production server.
This is the current raid:
# mdadm --detail /dev/md0
/dev/md0:
Version : 1.2
Creation Time : Mon Jul 25 12:55:48 2016
Raid Level : raid1
Array Size : 488382841 (465.76 GiB 500.10 GB)
Used Dev Size : 488382841 (465.76 GiB 500.10 GB)
Raid Devices : 3
Total Devices : 3
Persistence : Superblock is persistent
Update Time : Tue Mar 27 10:49:06 2018
State : clean
Active Devices : 3
Working Devices : 3
Failed Devices : 0
Spare Devices : 0
Name : x:0 (local to host x)
UUID : b2a5ed53:42890b73:dc6de22a:1ac12524
Events : 31038
Number Major Minor RaidDevice State
0 8 1 0 active sync /dev/sda1
1 8 17 1 active sync /dev/sdb1
2 8 33 2 active sync /dev/sdc1
I have to replace all disks (one per time, or, if possible, all at the
same time), by
adding new disks in spare slots (I have 3 free slots in this server).
The final configuration should be an increased raid/filesystem,
growing from the current 500GB to a 2TB
Any suggestions ?
I know that mdadm is able to replace a disks without bringing offline
the previous one, thus without affecting the redundancy. This is what
I would like to do.
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