is is possible to change the UUID of RAID devcies?
background: we have several machines with 4 disks (/boot RAID1, /
RAID10, /data RAID10)
the plan is buy twice as large SSDs (currently HDD), partition them from
a Live-ISO and dd-over-ssh the contents
at that time the RAID10 would be degraded and two disks out of the machines
besides the UUID one interesting question is how to make sure the copy
of /etc/mdadm.conf contains "RAID1" instead of "RAID10"
the reason for that game is that the machines are running for 10 years
now and all the new desktop hardware can't hold 4x3.5" disks and so just
put them in a new one isn't possible
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[root@srv-rhsoft:~]$ cat /etc/mdadm.conf
MAILADDR root
HOMEHOST localhost.localdomain
AUTO +imsm +1.x -all
ARRAY /dev/md0 level=raid1 num-devices=4
UUID=1d691642:baed26df:1d197496:4fb00ff8
ARRAY /dev/md1 level=raid10 num-devices=4
UUID=b7475879:c95d9a47:c5043c02:0c5ae720
ARRAY /dev/md2 level=raid10 num-devices=4
UUID=ea253255:cb915401:f32794ad:ce0fe396
-----------------
GRUB_CMDLINE_LINUX="quiet hpet=disable audit=0 rd.plymouth=0
plymouth.enable=0 rd.md.uuid=b7475879:c95d9a47:c5043c02:0c5ae720
rd.md.uuid=1d691642:baed26df:1d197496:4fb00ff8
rd.md.uuid=ea253255:cb915401:f32794ad:ce0fe396 rd.luks=0 rd.lvm=0
rd.dm=0 zswap.enabled=0 selinux=0 net.ifnames=0 biosdevname=0 noresume
hibernate=no printk.time=0 nmi_watchdog=0 acpi_osi=Linux
vconsole.font=latarcyrheb-sun16 vconsole.keymap=de-nodeadkeys
locale.LANG=de_DE.UTF-8"
