>>>>> "Gandalf" == Gandalf Corvotempesta <gandalf.corvotempesta@xxxxxxxxx> writes: Gandalf> Ok, it's time to replace 3 disks in a 3-way mirrors on a running Gandalf> production server. Gandalf> This is the current raid: Gandalf> # mdadm --detail /dev/md0 Gandalf> /dev/md0: Gandalf> Version : 1.2 Gandalf> Creation Time : Mon Jul 25 12:55:48 2016 Gandalf> Raid Level : raid1 Gandalf> Array Size : 488382841 (465.76 GiB 500.10 GB) Gandalf> Used Dev Size : 488382841 (465.76 GiB 500.10 GB) Gandalf> Raid Devices : 3 Gandalf> Total Devices : 3 Gandalf> Persistence : Superblock is persistent Gandalf> Update Time : Tue Mar 27 10:49:06 2018 Gandalf> State : clean Gandalf> Active Devices : 3 Gandalf> Working Devices : 3 Gandalf> Failed Devices : 0 Gandalf> Spare Devices : 0 Gandalf> Name : x:0 (local to host x) Gandalf> UUID : b2a5ed53:42890b73:dc6de22a:1ac12524 Gandalf> Events : 31038 Gandalf> Number Major Minor RaidDevice State Gandalf> 0 8 1 0 active sync /dev/sda1 Gandalf> 1 8 17 1 active sync /dev/sdb1 Gandalf> 2 8 33 2 active sync /dev/sdc1 Gandalf> I have to replace all disks (one per time, or, if possible, Gandalf> all at the same time), by adding new disks in spare slots (I Gandalf> have 3 free slots in this server). Gandalf> The final configuration should be an increased Gandalf> raid/filesystem, growing from the current 500GB to a 2TB Gandalf> Any suggestions ? Gandalf> I know that mdadm is able to replace a disks without bringing offline Gandalf> the previous one, thus without affecting the redundancy. This is what Gandalf> I would like to do. If you're running LVM on top of this array, then I would simply: 1. add three new disks into a new RAID1 array spanning the entire disk as /dev/md1 2. pvcreate /dev/md1 3. vgextend <vg> /dev/md1 4. pvmove -b /dev/md0 5. wait for the move to complete 6. vgreduce <vg> /dev/md0 Then you can simply stop the /dev/md0 with md and pull the drives once it's all quiet. This is why I really like putting LVM ontop of MD devices, since it makes volume moves like this really simple. John -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
