dual boot Windows10 fedora28

Hi,
I purchased an Asus laptop with 2 hard drives (SSD 256 GB and HDD 1 TB).
Windows10 was preinstalled on the SSD and the HDD drive is used for data.
I wanted to install fedora alongside Windows. 
So I shrinked the partition on the SSD drive (sdb)  and also the partition on the HDD
drive (sda).
I installed fedora on the new partition of the SDD drive.
So far so good. I can boot into Windows as well as Fedora.
Now I want to have /home, /usr/ and/ /tmp on the HDD drive, which I intend to use as
data-drive.
I created a mountpoint for the new partition of the HDD drive (sudo mkdir /mnt/sda2 and
sudo mount /dev/sda2 /mnt/sda2).
Now I am stuck. This is beyond my (limited) skills.
How do I realize that /home, /usr and and /tmp wil be stored on the HDD?
I need a step-by-step tutorial to proceed.
Thanks in advance.
Peter

[stan]

On Sat, 2 Jun 2018 20:03:59 +0200 (CEST)
&quot;peterlesterhuis(a)telfort.nl&quot; <peterlesterhuis(a)telfort.nl&gt; wrote:

>  Hi,
>  I purchased an Asus laptop with 2 hard drives (SSD 256 GB and HDD 1
>  TB). Windows10 was preinstalled on the SSD and the HDD drive is used
>  for data. I wanted to install fedora alongside Windows. 
>  So I shrinked the partition on the SSD drive (sdb)  and also the
>  partition on the HDD drive (sda). I installed fedora on the new
>  partition of the SDD drive. So far so good. I can boot into Windows
>  as well as Fedora. Now I want to have /home, /usr/ and/ /tmp on the
>  HDD drive, which I intend to use as data-drive. I created a
>  mountpoint for the new partition of the HDD drive (sudo
>  mkdir /mnt/sda2 and sudo mount /dev/sda2 /mnt/sda2). Now I am stuck.
>  This is beyond my (limited) skills. How do I realize that /home, /usr
>  and and /tmp wil be stored on the HDD? I need a step-by-step tutorial
>  to proceed. Thanks in advance. Peter 
I don't do this, so I'll just point you in the right direction.

First, don't use the drive id to mount partitions.  Run /usr/sbin/blkid
and use the UUID in /etc/fstab, in lines like this.

UUID=6fce1ad7-4382-4634-8a62-7ac8d707f5ff /mnt/s2b3               ext4    defaults       
0 2

And you won't mount at /mnt/sda2, you'll mount at /home, /usr /tmp in
order to do what you want. You'll have to create those directories
under your new partition, and make sure they have the correct
parameters (the same as /usr and /home have under /).

Some caveats.

/tmp is a temporary directory in that it is created each boot.  Not sure
how well your separate mount point will play with that default behavior.

I vaguely recall that /usr is required to be on the same partition
as /, in order for the kernel to find it during boot.  This is because
everything is now under /usr (libraries, binaries, etc.)  If that is
true, a separate /usr won't fly.

Finally, these new partitions don't replace the existing partitions
under / (except for /tmp).  So all the space they are using will still
be used, unless you clean it up after your new partitions are in place.

Someone else here might be able to give you better instructions (and
correct any errors I've made).

[Ahmad Samir]

On 2 June 2018 at 20:03, peterlesterhuis(a)telfort.nl
<peterlesterhuis(a)telfort.nl&gt; wrote:
>  Hi,
>
>  I purchased an Asus laptop with 2 hard drives (SSD 256 GB and HDD 1 TB).
>  Windows10 was preinstalled on the SSD and the HDD drive is used for data.
>
>  I wanted to install fedora alongside Windows.
>  So I shrinked the partition on the SSD drive (sdb)  and also the partition
>  on the HDD drive (sda).
>  I installed fedora on the new partition of the SDD drive.
>
>  So far so good. I can boot into Windows as well as Fedora.
>  Now I want to have /home, /usr/ and/ /tmp on the HDD drive, which I intend
>  to use as data-drive.
>  I created a mountpoint for the new partition of the HDD drive (sudo mkdir
>  /mnt/sda2 and sudo mount /dev/sda2 /mnt/sda2).
>  Now I am stuck. This is beyond my (limited) skills.
>  How do I realize that /home, /usr and and /tmp wil be stored on the HDD?
>  I need a step-by-step tutorial to proceed. 
It's not an answer to your question exactly, but I wouldn't move any
of /home, /usr or /tmp to the HDD:
- /tmp is mounted as tmpfs by default, so technically it's in the RAM
not on any disk
- /usr and /home are mostly where, almost any, app is going to load
files from when you start it for the first time after logging in;
IMHO, to make full use of an SSD, leave these two partitions be, it
_should_ make for a noticeable difference in app loading times.

What you could do to save some space on the SSD is create a new
partition on the HDD, and keep e.g. music, video, basically any large
files, on it, and just access them from there.

IIUC, SSD's are more resilient nowadays than they used to be, so just
make use of the I/O speed boost.

You can of course research the technical specs of the SSD you have and
see what the manufacturer has posted about the optimal/expected amount
of data that can be written to it in during its lifetime and plan
accordingly.

Assuming the file system is ext4, you can get an idea about the
average writes, to the SSD, per day by examining[1]:
$ cat /sys/fs/ext4/sdXX/lifetime_write_kbytes
$ cat /sys/fs/ext4/sdXX/session_write_kbytes

[1]https://www.spinics.net/lists/linux-ext4/msg16331.html

-- 
Ahmad Samir

[Samuel Sieb]

On 06/02/2018 11:03 AM, peterlesterhuis(a)telfort.nl wrote:
>  So far so good. I can boot into Windows as well as Fedora.
>  Now I want to have /home, /usr/ and/ /tmp on the HDD drive, which I 
>  intend to use as data-drive.
>  I created a mountpoint for the new partition of the HDD drive (sudo 
>  mkdir /mnt/sda2 and sudo mount /dev/sda2 /mnt/sda2). 
The HDD is the primary drive and the SSD is secondary?  That does 
complicate things a bit unless the BIOS is happy booting off the 
secondary drive.  It does sound like it is working because it seems 
that's how Windows is booting.

>  Now I am stuck. This is beyond my (limited) skills.
>  How do I realize that /home, /usr and and /tmp wil be stored on the HDD?
>  I need a step-by-step tutorial to proceed. 
I would suggest the easiest way would be to reinstall Fedora and use one 
of the custom disk layout options.  Then you can pick where you want 
your /home to be.  If the installer put /home on the SSD, then you 
should delete all the Fedora partitions on the SSD and put / and swap on 
there.

As others have said, /usr should stay on the SSD and /tmp is virtual 
anyway.  /home is fine to go on the HDD, it's not going to slow things down.

[Ahmad Samir]

On 3 June 2018 at 07:00, Samuel Sieb <samuel(a)sieb.net&gt; wrote:
[..]

>  /home is fine to go on the HDD, it's not going to slow things
> down.
>  
Actually it would make a rather noticeable difference, I didn't
measure exactly how much, in some apps loading times, e.g.:
- Firefox will read/load (and write) the user's profile from
~/.mozilla, having it on the SSD should be beneficial
- Opening an ePub in e.g. Calibre, having the file on the SSD, it's faster
- Even just opening a folder in Dolphin, the folders that reside on
the HDD (which are symlinked in my ~/) open a little bit slower than
the ones on the SSD

My point is, if you have an SSD, make use of the speed (otherwise why
shell out and get one in the first place).

-- 
Ahmad Samir

[Patrick O'Callaghan]

On Sun, 2018-06-03 at 11:39 +0200, Ahmad Samir wrote:
>  On 3 June 2018 at 07:00, Samuel Sieb <samuel(a)sieb.net&gt; wrote:
>  [..]
>  
>  > /home is fine to go on the HDD, it's not going to slow things down.
>  > 
>  
>  Actually it would make a rather noticeable difference, I didn't
>  measure exactly how much, in some apps loading times, e.g.:
>  - Firefox will read/load (and write) the user's profile from
>  ~/.mozilla, having it on the SSD should be beneficial
>  - Opening an ePub in e.g. Calibre, having the file on the SSD, it's faster
>  - Even just opening a folder in Dolphin, the folders that reside on
>  the HDD (which are symlinked in my ~/) open a little bit slower than
>  the ones on the SSD
>  
>  My point is, if you have an SSD, make use of the speed (otherwise why
>  shell out and get one in the first place). 
I have an SSD as root and boot. I find it gives dramatically faster
boot times and general DE startup, and presumably faster swap if that
ever needs to be used. I guess it also impacts on temp file usage
though I haven't measured it.

poc

[Samuel Sieb]

On 06/03/2018 02:39 AM, Ahmad Samir wrote:
>  On 3 June 2018 at 07:00, Samuel Sieb <samuel(a)sieb.net&gt; wrote:
>  [..]
>  
> > /home is fine to go on the HDD, it's not going to slow things down.
> >
>  
>  Actually it would make a rather noticeable difference, I didn't
>  measure exactly how much, in some apps loading times, e.g.:
>  - Firefox will read/load (and write) the user's profile from
>  ~/.mozilla, having it on the SSD should be beneficial
>  - Opening an ePub in e.g. Calibre, having the file on the SSD, it's faster
>  - Even just opening a folder in Dolphin, the folders that reside on
>  the HDD (which are symlinked in my ~/) open a little bit slower than
>  the ones on the SSD 
"a little bit slower" is my point.  A typical user is not going to 
notice, but it depends on the usage.  In my case, doing development on a 
massive Java project in Eclipse, yes, having it on an SSD makes a huge 
difference.

>  My point is, if you have an SSD, make use of the speed (otherwise
> why
>  shell out and get one in the first place). 
In this case, the SSD is already being shared between Windows and 
Fedora, so there is not going to be a lot of space.  It makes more sense 
to put the / partition on the SSD to take advantage of the biggest speed 
up and use the large HDD for user files.