Moving filesystem from sd-card to ssd

Help and Support Raspberry Pi
1

Hi,
I just moved the / filesystem to an ssd and modified the /boot/cmdline.txt:
root=/dev/sda1 rootfstype=ext4 rootwait quiet osmcdev=rbp2

After a reboot it looks fine!

But the system is automatically mounting /dev/mmcblk0p2 to /media/xxxxxxxxx

How can I disable mounting the second partition from the sd-card?

Thanks

2

You could move the FAT partition to the SSD and boot just from that (if your RPi is young enough) then you don’t need the SD at all.

3

Let me think about it…
Actually it would be ok to just boot from SD-card and keep the data on ssd.
Any chance to not mount /dev/mmcblk0p2 automatically?

4

I don’t understand what the downside is to having mmcblk0p2 mount, but the answer is you would have to dig in the udev rules I believe.

5

That’s why I don’t need mmcblk0p2 automatically mounted on system startup.

/dev/sda1 220G 2,2G 206G 2% /
/dev/mmcblk0p1 316M 30M 286M 10% /boot
/dev/mmcblk0p2 15G 2,2G 12G 17% /media/5b1a8e1f-334b-404c-b0ff-0a213e1c1f5b

Any ideas where exactly to look for disabling?

6

I can’t give give it to you on a plate but you might find a way to blacklist the partition based on its UUID. Here’s a USB flash drive I added to my Pi3:

osmc@osmc:~$ blkid -o udev -p /dev/sda1
ID_FS_UUID=c91adeb7-28d9-434a-99bf-b6aa283e2d9e
ID_FS_UUID_ENC=c91adeb7-28d9-434a-99bf-b6aa283e2d9e
ID_FS_VERSION=1.0
ID_FS_TYPE=ext2
ID_FS_USAGE=filesystem
ID_PART_ENTRY_SCHEME=dos
ID_PART_ENTRY_UUID=9fce7055-01
ID_PART_ENTRY_TYPE=0x83
ID_PART_ENTRY_NUMBER=1
ID_PART_ENTRY_OFFSET=2048
ID_PART_ENTRY_SIZE=60618752
ID_PART_ENTRY_DISK=8:0

A hacky workaround might simply be to include it in /etc/fstab with the noauto option. With a bit of luck udisks-glue won’t pick it up since it has the potential to be mounted. Haven’t tried it myself and am out of time for today. Good luck!

7

Got it, thanks:

https://discourse.osmc.tv/t/prevent-automount-of-partitions-by-uuid/15280/9

8

That was a complicated solution, for sure, but kudos to the poster for having the courage to deal with udisks-glue. :wink:

I managed to try out my hacky workaround in /etc/fstab – and it works. The classic one-liner!

osmc@osmc:~$ grep dummy /etc/fstab
UUID=c91adeb7-28d9-434a-99bf-b6aa283e2d9e	/mnt/dummy ext2	noauto,nofail	0	0
osmc@osmc:~$ blkid
/dev/mmcblk0p1: UUID="A269-73B7" TYPE="vfat" PARTUUID="a13c9b62-01"
/dev/sda1: UUID="c91adeb7-28d9-434a-99bf-b6aa283e2d9e" TYPE="ext2" PARTUUID="9fce7055-01"
/dev/mmcblk0: PTUUID="a13c9b62" PTTYPE="dos"
9

The /etc/fstab was my second choice, but Yes it works.
Thanks and take care!

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