On Fri, 26 Nov 2021 04:43:32 +0000, eho wrote:
> This is a bit new to me. Does tmpfs for /tmp mean an entry in
> /etc/fstab?
>
> I have
>
> (...)
> /dev/sda6 /tmp ext4 defaults 1 2 (...)
>
> And should I now write
>
> tmpfs /dev/sda6 tmpfs defaults 0 0
You should edit that to:
tmpfs /tmp tmpfs defaults 0 0
> BTW can it be a problem to have too much partitions?
If I remember right it at least used to be a limit of 15 partitions, but
I don't know for sure if that limit still applies.
That limit of 16 partitions came from the device numbering, looking at
/dev/sda and /dev/sdb:
brw-r----- 1 root disk 8, 0 Apr 29 1995 /dev/sda
brw-r----- 1 root disk 8, 1 Apr 29 1995 /dev/sda1
brw-r----- 1 root disk 8, 10 Apr 29 1995 /dev/sda10
brw-r----- 1 root disk 8, 11 Apr 29 1995 /dev/sda11
brw-r----- 1 root disk 8, 12 Apr 29 1995 /dev/sda12
brw-r----- 1 root disk 8, 13 Apr 29 1995 /dev/sda13
brw-r----- 1 root disk 8, 14 Apr 29 1995 /dev/sda14
brw-r----- 1 root disk 8, 15 Apr 29 1995 /dev/sda15
brw-r----- 1 root disk 8, 2 Apr 29 1995 /dev/sda2
brw-r----- 1 root disk 8, 3 Apr 29 1995 /dev/sda3
brw-r----- 1 root disk 8, 4 Apr 29 1995 /dev/sda4
brw-r----- 1 root disk 8, 5 Apr 29 1995 /dev/sda5
brw-r----- 1 root disk 8, 6 Apr 29 1995 /dev/sda6
brw-r----- 1 root disk 8, 7 Apr 29 1995 /dev/sda7
brw-r----- 1 root disk 8, 8 Apr 29 1995 /dev/sda8
brw-r----- 1 root disk 8, 9 Apr 29 1995 /dev/sda9
brw-r----- 1 root disk 8, 16 Apr 29 1995 /dev/sdb
brw-r----- 1 root disk 8, 17 Apr 29 1995 /dev/sdb1
brw-r----- 1 root disk 8, 26 Apr 29 1995 /dev/sdb10
brw-r----- 1 root disk 8, 27 Apr 29 1995 /dev/sdb11
brw-r----- 1 root disk 8, 28 Apr 29 1995 /dev/sdb12
brw-r----- 1 root disk 8, 29 Apr 29 1995 /dev/sdb13
brw-r----- 1 root disk 8, 30 Apr 29 1995 /dev/sdb14
brw-r----- 1 root disk 8, 31 Apr 29 1995 /dev/sdb15
brw-r----- 1 root disk 8, 18 Apr 29 1995 /dev/sdb2
brw-r----- 1 root disk 8, 19 Apr 29 1995 /dev/sdb3
brw-r----- 1 root disk 8, 20 Apr 29 1995 /dev/sdb4
brw-r----- 1 root disk 8, 21 Apr 29 1995 /dev/sdb5
brw-r----- 1 root disk 8, 22 Apr 29 1995 /dev/sdb6
brw-r----- 1 root disk 8, 23 Apr 29 1995 /dev/sdb7
brw-r----- 1 root disk 8, 24 Apr 29 1995 /dev/sdb8
brw-r----- 1 root disk 8, 25 Apr 29 1995 /dev/sdb9
As you can see the disks /dev/sda and /dev/sdb both have the major number
8. Disk /dev/sda has minor number 0 and disk /dev/sdb has minor number
16. Partitions on /dev/sda have minor numbers 1-15 and partitions on /dev/
sdb have minor numbers 17-31. If I remember right it was possible to
change a kernel setting and recompile the kernel to increase this limit.
But this was back in the old days, maybe udev now somehow solves that
problem automagically.
regards Henrik