#Fdisk create gpt partition how to
#Fdisk create gpt partition update
#Fdisk create gpt partition free

As of this recording, experimental GPT support has been added to fdisk. Newer systems use UEFI and with that GUID partition table or GPT. Cfdisk is a curses based application that's somewhat visual. All arguments are provided on the command line and carried out. Sfdisk is command line only and non-interactive for scripts. There are actually three different fdisk programs. All logical partitions will be numbered five and higher. All primary and extended partitions will be numbered one through four. Inside this extended partition we can then create logical partitions. If you want more partitions one of these four needs to be an extended partition. MBR systems have a limitation of four real partitions otherwise known as primary partitions and accessible size of two Terabytes. Fdisk is the Legacy tool for BIOS MBR based systems. Legacy Systems uses a BIOS to boot the machine and the BIOS stores it's partition table in the MBR or Master Boot Record. To partition our bare slash dev slash sdb drive we can use one of three commands. Type in clear, then type in sudo space fdisk space dash l space slash dev slash sdb and hit enter. To get a list of all partitions on slash disk slash sdb we will need to specify it. This will show all partitions on all drives, also note that this shows what type of a partition table a drive might have. If you want to read the partition table for all drives directly, you can use fdisk dash l type in clear then type in sudo space fdisk space dash L and hit enter. We can see that slash dev slash sda has partitions on it, and their mounted as slash boot and slash but slash dev slash sdb is bare. This also gives a visual of the drives and their partitions, or logical volumes. Another tool that's useful in determining the available drives is LSBLK. This is the list of drives and partitions that the colonel currently recognizes. This information comes from the colonel directly. In a terminal type in cat space slash proc slash partitions and hit enter. We can do this by catting proc partitions. The first thing we want to do is get a list of drives in the system. Power up your VM, log in, and open a terminal.

#Fdisk create gpt partition how to

Parted and sfdisk don't appear to work this way from what I can tell and I am still very new at this to understand how to automate those tools at this time.- Let's create some partitions now.

#Fdisk create gpt partition free

The thing about fdisk that worked for me is that after you specify the partition number it already calculated the next free sector so all I have to do at this point is send a blank line for my start and then the +1M for my total size. I have been reading up on fdisk and have learned it is not suited well for scripting so what I am seeing is that when in script mode, fdisk might be asking for p my script already thinks it's time to send the 1. So the commands are being sent like this: n This functions creates partition 1 thru 3 then a different function handles the extended (4th) and another handles 5th to nn.ДЄs I said before, this script is fully functional my problem is that at times the commands being sent to fdisk seem to arrive at the wrong timing, which then breaks the entire script thereby breaking any automation. At the start of the script we ask the user for the number of partitions to create, their size (this is static for all), and type of FS if any. Here is an example of one of my functions.

#Fdisk create gpt partition update

Is there a way to use parted or sfdisk (or any other tool that would already be a part of these distros) so that I could script a loop from 1 to x operations without having to do this accounting of remaining space? Does anyone have any examples they could share? Update Every time I run this function this just makes an additional 1gb partition from any unused space. My issue is that with fdisk you can state something like 'new partition +1gb' over and over and this works for me because in my script I don't need to keep track of prior partitions or remaining space or do any calculations. I have looked at parted and sfdisk and don't really understand how to use these tools. 1 out of 10 times my script will work correctly. I assume this is because of timing of the input commands occurring at the wrong times and getting out of sync. I have attempted to do this in BASH with fdisk via a 'here document' which works but as you can guess blows up in various steps. For QA purposes I need to be able to partition a drive via a bash script up to 30 or more partitions for both RHEL and SLES.