lordaker
Posts: 30
Joined: Wed Sep 20, 2017 8:31 am

How make a swap space on Rapberry Pi by using USB Drive ?

Mon Feb 19, 2018 2:36 pm

Hello,

I use an usb drive of 32gb and I want to use it like my swap partition for my Raspberry Pi 3.

I formated it with the command " fdisk /dev/sda "

And I create a swap file by using this proccess:

http://raspberrypimaker.com/adding-swap ... spberrypi/

But my swap.file can't research the max of usb drive.

So when I make the command " free -h"
My swap have the value " 1.2 G"

How can I change that ?

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HawaiianPi
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Location: Aloha, Oregon USA

Re: How make a swap space on Rapberry Pi by using USB Drive ?

Mon Feb 19, 2018 9:57 pm

Why do you think you need 32GB of swap? :shock:

If you actually try to use even a fraction of that it will drag your Pi's performance down to unuseable levels. But since you asked, don't use a swap file, use a swap partition. Format the drive as Linux swap and mount it in /etc/fstab.
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fbe
Posts: 223
Joined: Thu Aug 17, 2017 9:08 pm

Re: How make a swap space on Rapberry Pi by using USB Drive ?

Mon Feb 19, 2018 11:03 pm

I could get 4GB swapfile by increasing CONF_SWAPSIZE and CONF_MAXSWAP in /etc/dphys-swapfile (I didn't try bigger values).

Is Raspbian (32bit) really able to use more than 4GB virtual memory?

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thagrol
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Re: How make a swap space on Rapberry Pi by using USB Drive ?

Tue Feb 20, 2018 4:12 pm

Going over 4GB in a file will be restricted by which filesystem the USB stick has been formatted with. FAT32 for example has a hard filesize limit of 4GB.

That said, a 32GB swap partition is likely to be pointless anyway, whether or not raspbian can address it.

Most sources recommend having swap space between 1 and 2 times the size of the installed RAM. For most Pi models that's a minimum of 1GB and a maximum of 2GB.
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