Re: Install / as RAID 0

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On Tue, 2018-10-16 at 08:06 -0500, Richard Shaw wrote:
> I got some very old computers (Pentium 4) and quite frankly it's
> choking on the installer (40 minutes to draw a window to setup
> partitions), but since it's a system I don't care about I wanted to
> experiment with RAID since I've never done so before.
> 
> To make setting up the partitions easier I used System Rescue CD
> which boots up and is usable within a reasonable amount of time. The
> systems came with 80GB drives so I move one over and setup the
> partition layout is as follows:
> 
> /dev/sda1 /boot 4GB (too big, but I want it to match partition 1 on
> sdb)
> /dev/sda2 RAID 0 (remainder)
> /dev/sdb1 SWAP 4GB
> /dev/sdb2 RAID 0 (remainder)
> 
> I setup the RAID 0 with mdadm...

If you just want to get it installed so that you can play with it, then
the installer can do the raid creation for you. I agree that there is
value in learning to do it via mdadm before hand but that is really not
required now.

I used vitual box to do a minimal install using:

Fedora-Workstation-netinst-x86_64-28-1.1.iso

I made all partitions raid0 just to test it.

I used the custom disk setup option and created the below...
(nothing changed after install)

$ df -Th
Filesystem     Type      Size  Used Avail Use% Mounted on
devtmpfs       devtmpfs  483M     0  483M   0% /dev
tmpfs          tmpfs     493M     0  493M   0% /dev/shm
tmpfs          tmpfs     493M  604K  492M   1% /run
tmpfs          tmpfs     493M     0  493M   0% /sys/fs/cgroup
/dev/md125     ext4      6.6G  873M  5.4G  14% /
tmpfs          tmpfs     493M  4.0K  493M   1% /tmp
/dev/md126     ext4      575M   88M  446M  17% /boot
tmpfs          tmpfs      99M     0   99M   0% /run/user/1000

$ swapon -s
Filename		Type		Size	Used	Priority
/dev/md127             	partition	2099196	0	-2


$ cat /proc/mdstat 
Personalities : [raid0] 
md125 : active raid0 sda3[0] sdb3[1]
      7032832 blocks super 1.2 512k chunks
      
md126 : active raid0 sdb2[1] sda2[0]
      614400 blocks super 1.2 512k chunks
      
md127 : active raid0 sda1[0] sdb1[1]
      2099200 blocks super 1.2 512k chunks
      
unused devices: <none>



$ ls -la /dev/md
total 0
drwxr-xr-x.  2 root root  100 Oct 16 07:33 .
drwxr-xr-x. 20 root root 3860 Oct 16 07:33 ..
lrwxrwxrwx.  1 root root    8 Oct 16 07:33 boot -> ../md126
lrwxrwxrwx.  1 root root    8 Oct 16 07:33 root -> ../md125
lrwxrwxrwx.  1 root root    8 Oct 16 07:33 swap -> ../md127


-- 
Doug H.

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