Linux – Scriptable GPT Partitions Using Parted

bashlinuxpartedpartitionscripting

I am partitioning eMMC using following commands in the script,

parted /dev/mmcblk0 --script mklabel gpt
parted /dev/mmcblk0 --script mkpart primary ext4 32MB 132MB
parted /dev/mmcblk0 --script mkpart primary ext4 233MB 433MB
parted /dev/mmcblk0 --script mkpart primary ext4 433MB 533MB
parted /dev/mmcblk0 --script mkpart primary ext4 533MB 593MB
parted /dev/mmcblk0 --script mkpart primary ext4 593MB 793MB
parted /dev/mmcblk0 --script mkpart primary ext4 793MB 3800MB
parted /dev/mmcblk0 --script align-check min 1

Is it the correct way to create partition in the script ? Is there any better way ?
After creating first partition i am getting following warning

Warning: The resulting partition is not properly aligned for best performance.

Do i need to worry about it ?
I tried parted /dev/mmcblk0 --script align-check min 1 but not sure that's the solution. Any pointers for that?
I am going through this link meanwhile any other suggestions ?

Edit:
Just a quick reference for frostschutz reply,

MiB = Mebibyte = 1024 KiB
KiB = Kibibyte = 1024 Bytes
MB = Megabyte = 1,000 KB
KB = Kilobyte = 1,000 Bytes

Best Answer

It's correct in principle but you might consider reducing it to a single parted call.

parted --script /device \
    mklabel gpt \
    mkpart primary 1MiB 100MiB \
    mkpart primary 100MiB 200MiB \
    ...

Your alignment issue is probably because you use MB instead of MiB. You should not need an actual align-check command when creating partitions on MiB boundaries / on a known device.

Related Solutions

Linux – How to create new partitions and format the hard drive in parted

First, make sure you understand the difference between primary, extended and logical partitions. To create a logical partition, you first need to create the extended partition that will contain it. If there's only one partition on a drive, there's no point in not making it primary. Below I'll give instructions for a logical partition; creating a primary partition is similar, only simpler, so you should be able to figure it out.

Parted isn't the easiest tool for a straightforward task, a dedicated partitioning tool such as cfdisk or even fdisk may be easier to apprehend. But here goes (untested, make sure you understand what's going on and don't proceed blindly if you see error messages). You'll need to enter the size of the device when creating the partition (parted displays it).

/dev/sdb
mklabel msdos
mkpart extended 0 123456
mkpart logical 0 123455

Then run mkfs.ext3 /dev/sdb5 outside Parted.

If you choose to use cfdisk, you should be able to navigate its menu-driven interface. If you prefer fdisk, the sequence of instructions is:

n             create partition
e             extended
1             number (1–4)
<return>      accept default start
<return>      accept default end
n             create partition
l             logical
<return>      accept default start
<return>      accept default end
p             show the current table, review it
w             write changes
q             exit

Related Question