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For more information, check: http://bugs.contribs.org/show_bug.cgi?id=2154
For more information, check: http://bugs.contribs.org/show_bug.cgi?id=2154
*For disks previously formatted as GPT this is insufficient. It's probably best to use gdisk or parted or partx to delete the partitions; there are other tools that will work. Parted has limited support for LVM.
*To remove the (hardware) RAID configuration that is stored at the end of the drive, do:
*For disks previously formatted as GPT this is insufficient. It's probably best to use gdisk or parted or partx to delete the partitions; there are other tools that will work. Parted has limited support for LVM.<br />
#dd if=/dev/zero of=/dev/sdx bs=512 count=2048 seek=$((`blockdev --getsz /dev/sdx` - 2048))
====Upgrading the Hard Drive Size====
====Upgrading the Hard Drive Size====
sdc
sdc
</syntaxhighlight>then you can create the Raid array. We assume you only need one Raid partition, and hence do not need to partition it.<syntaxhighlight lang="bash">
</syntaxhighlight>then you can create the Raid array. We assume you only need onethen you need to rebuild the grub.conf, depending on your system is EFI or legacy use the appropriate command#EFI
grub2-mkconfig -o /boot/efi/EFI/centos/grub.cfg
<nowiki>#</nowiki>Legacy
grub2-mkconfig -o /boot/grub2/grub.cfg
Raid partition, and hence do not need to partition it.<syntaxhighlight lang="bash">
#create array
#create array
mdadm --create --verbose /dev/md11 --level=1 --raid-devices=2 /dev/sdb /dev/sdc
mdadm --create --verbose /dev/md11 --level=1 --raid-devices=2 /dev/sdb /dev/sdc
UUID=0ab4fe2a-aa81-4728-90d8-2f96d4624af8 /home/e-smith/files xfs uquota,gquota 0 0
UUID=0ab4fe2a-aa81-4728-90d8-2f96d4624af8 /home/e-smith/files xfs uquota,gquota 0 0
</syntaxhighlight>finally to have the disk mounted on reboot, you need to alter grub
</syntaxhighlight>To have the disk mounted on reboot, you need to alter grub<syntaxhighlight lang="bash">
vim /etc/default/grub
</syntaxhighlight>and alter the command line to add either "rd.md=1 rd.md.conf=1 rd.auto=1" or specifically add the uuid to mount (obviously if you add a LVM layer you will rather need to add something like rd.lvm.lv=mylvm/video rd.lvm.lv=mylvm/files)<syntaxhighlight lang="bash" line="1">
GRUB_TIMEOUT=5
GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"
GRUB_DEFAULT=saved
GRUB_DISABLE_SUBMENU=true
GRUB_TERMINAL_OUTPUT="gfxterm"
GRUB_CMDLINE_LINUX="rhgb quiet rootflags=uquota,pquota rd.md=1 rd.md.conf=1 rd.auto=1"
GRUB_DISABLE_RECOVERY="false"
GRUB_BACKGROUND="/boot/grub2/smeserver10.png"
GRUB_GFXMODE="1024x768"
GRUB_THEME="/boot/grub2/themes/koozali/theme.txt"
</syntaxhighlight>then you need to make sure dracut will add the drivers<syntaxhighlight lang="bash">
vim /etc/dracut.conf
</syntaxhighlight>and alter the line needed (you probably will need to uncomment this line and add mdraid between the quote)<syntaxhighlight lang="bash" line="1" start="19">
# dracut modules to add to the default
add_dracutmodules+="lvm mdraid"
# install local /etc/mdadm.conf
mdadmconf="yes"
# install local /etc/lvm/lvm.conf
lvmconf="yes"
</syntaxhighlight>Finally rebuild the initfs<syntaxhighlight lang="bash">
cp /boot/initramfs-$(uname -r).img /boot/initramfs-$(uname -r).img.old
dracut --add="lvm mdraid" /boot/initramfs-$(uname -r).img $(uname -r) --force
</syntaxhighlight>
== Copy data from one disk of an old Raid mirror disk ==
== Copy data from one disk of an old Raid mirror disk ==
rsync -arvHAX /mnt/olddisk/home/e-smith/files/ /home/e-smith/files
rsync -arvHAX /mnt/olddisk/home/e-smith/files/ /home/e-smith/files
</syntaxhighlight>then to remove safely your disk<syntaxhighlight lang="bash">
</syntaxhighlight>then to remove safely your disk<syntaxhighlight lang="bash">
umount /dev/mapper/main-root
vgchange -a n main
vgchange -a n main
mdadm --stop /dev/md126
mdadm --stop /dev/md126
</syntaxhighlight>
</syntaxhighlight>