look for "sd " some number "[sdx]"
dd if=/dev/old of=/dev/new bs=512 count=1
echo "- - -" > /sys/class/scsi_host/host0/scan # force kernel to reread drive
cfdisk /dev/new - Delete and recreate as needed - new partitions must be at least as big as the old. - Verify and write - exit fdisk
parted -a optimal /dev/new (parted) mklabel gpt ; We need this for big partitions - label in this case means a new partition table of the gpt type (parted) mkpart primary 8192S 23447039S ; make an aligned 12 GB partition (parted) mkpart primary 23453696s -1 ; use the rest of the drive for the second partition (parted) set 1 raid on (parted) set 2 raid on (parted) q
sfdisk -R /dev/new sfdisk -V /dev/new ; make sure it is valid echo "- - -" > /sys/class/scsi_host/host0/scan # force kernel to reread drive again sync
Use parted to do an optimal alignment of the entire disk
$ parted --align optimal /dev/new GNU Parted 3.2 Using /dev/sde Welcome to GNU Parted! Type 'help' to view a list of commands. (parted) mklabel gpt Warning: The existing disk label on /dev/sde will be destroyed and all data on this disk will be lost. Do you want to continue? Yes/No? yes (parted) mkpart primary 0% 100% (parted) q
mdadm -a /dev/md0 /dev/new1
(new in the form sdxd where x is the drive letter and d is the partition number - needs to rhyme with what was in mdstat )
mdadm -f /dev/mdz /dev/sdxd ; fails the unit where 'z' is the raid and x is the drive and d is the partition number mdadm -r /dev/mdz /dev/sdxd ; removes the unit echo "- - -" > /sys/class/scsi_host/host0/scan # force kernel to reread drive sync
mdadm --grow -z max /dev/md0 ; You could use some size in kB if you don't want the whole drive /usr/share/mdadm/checkarry /dev/mdx ; This is not needed, but might be a good check.
vgdisplay ; See where we start pvresize /dev/md0 vgdisplay ; should now show the new size lvdisplay ; find the logical volume you want to expand lvresize -l +100%FREE /dev/vgname/lvname ; to use max size - other options available
mount -o remount,resize /mountpoint ; works for jfs - YMMV with other systems
touch /forcefsck ; force a full check next boot
grub-install /dev/sdz ; We want all drives bootable
cfdisk /dev/new (or partition editor of choice) <edit as required>
sfdisk -d /dev/(old|new1)
mdadm --zero-superblock /dev/sd??
Regarding the partitioning...beware of the tools you use. In general, the partitions created by fdisk/sfdisk/cfdisk are not all happily compatible with each other, and may or may not be compatible with Windows (particularly Windows 7/Vista).
Try them in the order cfdisk, fdisk, sfdisk. (Indeed, cfdisk is a beautiful program that has strict requirements on the partition tables it accepts, and produces high quality partition tables. Use it if you can. fdisk is a buggy program that does fuzzy things - usually it happens to produce reasonable results. Its single advantage is that it has some support for BSD disk labels and other non-DOS partition tables. Avoid it if you can. sfdisk is for hackers only - the user interface is terrible, but it is more correct than fdisk and more powerful than both fdisk and cfdisk. Moreover, it can be used noninteractively.)
That's why I put boot on primary partition one, and clone the first sector (and partition table) so there are no surprises with a non-booting system. I typically just blow away the extended partition table which (for me) contains root, swap, and a partition for LVM:
Device Boot Start End Blocks Id System /dev/sda1 * 1 31 248976 fd Linux raid autodetect /dev/sda4 32 121601 976511025 5 Extended /dev/sda5 32 156 1004031 fd Linux raid autodetect /dev/sda6 157 405 2000061 fd Linux raid autodetect /dev/sda7 406 121601 973506838+ fd Linux raid autodetect
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