Partition layout

NetRock · 01-04-2013, 08:17 AM

Hi,
I am trying to use parted in bash script to create partition table using percentage of the total disk space.
I want to use % so do not have to change script for different HDD size.
I get the total disk size this way:

Code:

DEV=/dev/sda 
 HDDSZ=$( parted -s $DEV unit B print | grep "^Disk $DEV:" | cut -f 3 -d " " | tr -d B )

Then how can i use parted in the script.
Thanks for your quick prompt

acid_kewpie · 01-04-2013, 08:28 AM

Any chance of a little background on your need to do this in the first place? It seems like a pretty weird layout. 1gbfor /boot is a waste for one thing... and why no LVM? Where on earth does 0.31% come from? Why is the extended partition left 89% empty?

It looks like parted scripts can take a % sign anyway, so there's no need to calculate the percentages yourself in the first place.

Code:

parted -s $DEV unit MB mkpart primary 0% 1%

http://linux.die.net/man/8/parted

NetRock · 01-04-2013, 09:15 AM

Thanks for your reply.

acid_kewpie · 01-04-2013, 09:18 AM

Can you respond to the questions in my post, or any of the contents at all? Just posting more information isn't exactly engaging in a discussion.

NetRock · 01-04-2013, 09:33 AM

Chris, Sorry about that.
Well, i know i need to change the layout, this layout was used for many years and given to me, perhaps you can share your idea to the best way as how to manage the size for sda1 to sda8 with respect to their file system.
But my concern is to get the script working first and then the layout can be changed with your suggestions.
i do not wish to use LVM at this time.
i appreciate your help.
Thanks

acid_kewpie · 01-04-2013, 09:35 AM

well as above, you can put percentages into the parted script, so how does that work?

TobiSGD · 01-04-2013, 09:37 AM

Quote:

Originally Posted by NetRock

where 1075MB comes from since i have 1025MB in the script.

parted internally doesn't work with MB, it works with cylinders, so partitions will be aligned to the next cylinder, IIRC.

NetRock · 01-04-2013, 09:38 AM

I use this command to know where begins the first sector:

Quote:

parted /dev/sda unit s p free

Disk /dev/sda: 1048576000s
Sector size (logical/physical): 512B/512B
Partition Table: gpt

Number Start End Size File system Name Flags
34s 1048576000s 1048576000s Free Space

acid_kewpie · 01-04-2013, 09:55 AM

why do you care where the first sector is?

NetRock · 01-04-2013, 09:59 AM

to create partitions correctly aligned ....!!

acid_kewpie · 01-04-2013, 10:00 AM

parted should do this for you if you use percentages I'd presume.

Note that kickstart or other installer toosl do this trivially, that might be a better option anyway.