Am 30.07.19 um 13:07 schrieb Gandalf Corvotempesta:
> as I need more space and I have some free slots on the server, can I
> replace 1 by 1 (by adding a new disk and removing the old one from the
> array when done), with some SSDs ?
>
> Something like this:
>
> # Sync disk partitions
> sfdisk --dump /dev/sda | sfdisk /dev/sdc
> sfdisk --dump /dev/sdb | sfdisk /dev/sdd
>
> # Rebuild array
> mdadm /dev/md0 --add /dev/sdc1
> mdadm /dev/md0 --replace /dev/sda1 --with /dev/sdc1
> mdadm /dev/md0 --add /dev/sdd1
> mdadm /dev/md0 --replace /dev/sdb1 --with /dev/sdd1
>
> This should replace, with no loss of redundancy, sda with sdc and sdb with sdd.
> Then I have to re-install the bootloaded on new disks and reboot to
> run from the SSDs
>
> Any thoughts ? What about LVM ? By syncing the disk partitions and
> the undelying array, LVM should be up & running on next reboot
> automatically, even if moved from SAS to SSD, right?
mdraid don't care and LVM can't care because it sees just block devices
for BIOS setups i use that script for years now to clone the MBR and
install the bootloader on the replaced disk on several machines while my
home machine got 2 out of 4 repalced with SSD two years ago and last
summer the remaining two where replaced by Samsung Evo860 2 TB
[root@srv-rhsoft:/downloads]$ LANG=C df
Filesystem Type Size Used Avail Use% Mounted on
/dev/md1 ext4 29G 7.4G 22G 26% /
/dev/md0 ext4 485M 44M 437M 10% /boot
/dev/md2 ext4 3.6T 1.7T 2.0T 46% /mnt/data
--------------------------
[root@srv-rhsoft:/downloads]$ cat /scripts/raid-recovery.sh
#!/usr/bin/bash
GOOD_DISK="/dev/sda"
BAD_DISK="/dev/sdd"
# --------------------------------------------------------------------------
echo "NOT NOW"
exit
# --------------------------------------------------------------------------
# clone MBR
dd if=$GOOD_DISK of=$BAD_DISK bs=512 count=1
# force OS to read partition tables
partprobe $BAD_DISK
# start RAID recovery
mdadm /dev/md0 --add ${BAD_DISK}1
mdadm /dev/md1 --add ${BAD_DISK}2
mdadm /dev/md2 --add ${BAD_DISK}3
# print RAID status on screen
sleep 5
cat /proc/mdstat
# install bootloader on replacement disk
grub2-install "$BAD_DISK"
