Hi,
I want to ask you for help,
I am new to Nextcloud and Linux and i need help with setup.
Have purchased a home server with two SSDs and two HDDs. Is it possible to connect it as two SSD Raid1 and two HDD Raid1?
An SSD Raid1 would be Nextcloud system and HDD Rad1 would be storage.
Or is it a bad idea?
I greatly appreciate your help.
I believe this is not the topic of this forum, but for sure, everything is possible:
https://help.ubuntu.com/community/Installation/SoftwareRAID
and/or simply (not for a System Partitions):
mdadm --create --verbose --level=1 --raid-devices=2 /dev/md1 /dev/sdc /dev/sdd
mdadm --detail --scan >> /etc/mdadm.conf
Here is also nice read about:
You can install System on raid SSDs and create a new one for a HDDs, just to be on a safe side, make raid size about 100 MB smaller then your HDD/SDD this will help if you will replace the disk and it is a bit smaller than your older one.
Then think about security and use encryption. In this case if one Disk fails, you will simply replace it with no care if somebody can repair drive and recover/read older information from it or not:
@gas85 Thank you very much for the prompt reply.
Than is ok to have Nexcloud installed on SSD raid and the DATA files on HDD raid?
Thank you.
Yes, you can. I have similar setup, but System is not on a RAID.
# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
loop0 7:0 0 93.9M 1 loop /snap/core/9066
loop1 7:1 0 97M 1 loop /snap/core/9289
sda 8:0 0 5.5T 0 disk
`-sda1 8:1 0 5.5T 0 part
`-md0 9:0 0 5.5T 0 raid1
`-raid 253:3 0 5.5T 0 crypt
`-raid--vg-data--lv 253:4 0 5.5T 0 lvm /mnt/raid
sdb 8:16 0 5.5T 0 disk
`-sdb1 8:17 0 5.5T 0 part
`-md0 9:0 0 5.5T 0 raid1
`-raid 253:3 0 5.5T 0 crypt
`-raid--vg-data--lv 253:4 0 5.5T 0 lvm /mnt/raid
sdc 8:32 0 465.8G 0 disk
`-md1 9:1 0 931.3G 0 raid0
`-smallRaid 253:2 0 931.3G 0 crypt
`-vg--smallraid-lv--smallraid 253:5 0 931G 0 lvm /mnt/smallraid
sdd 8:48 0 465.8G 0 disk
`-md1 9:1 0 931.3G 0 raid0
`-smallRaid 253:2 0 931.3G 0 crypt
`-vg--smallraid-lv--smallraid 253:5 0 931G 0 lvm /mnt/smallraid
sde 8:64 0 477G 0 disk
|-sde1 8:65 0 512M 0 part /boot/efi
|-sde2 8:66 0 1G 0 part /boot
`-sde3 8:67 0 475.4G 0 part
|-ubuntu--vg-ubuntu--lv 253:0 0 150G 0 lvm /
`-ubuntu--vg-nextcoud_previews_lv 253:1 0 150G 0 lvm
Here 3 points to check.
I have managed to install Ubuntu 18.04 LTS and my disk are in RAID 1
2x 500GB SSD - Raid1 (md0) this is the primary disk ubuntu installation.
and
2x 5TB HDD - Raid1 (md1)
now im stuck,
md0 raid is mounted as /
and md1 raid as /srv
but now when i do cd /srv it points to the md0 /srv system not the second md1 /srv.
can i mount the second md1 to the systems md0 /srv?
after then i can install nextcloud and point data dir to the md0 /srv dir and be able to use that 5TB disk as data dir for NC.
NAME SIZE FSTYPE TYPE MOUNTPOINT
loop0 89.1M squashfs loop /snap/core/8268
loop1 96.5M squashfs loop /snap/core/9436
sda 465.8G disk
└─sda1 465G linux_raid_member part
└─md0 464.9G ext4 raid1 /
sdb 465.8G disk
├─sdb1 512M vfat part /boot/efi
└─sdb2 465G linux_raid_member part
└─md0 464.9G ext4 raid1 /
sdc 4.6T disk
└─sdc1 4.6T linux_raid_member part
└─md1 4.6T ext4 raid1 /srv
sdd 4.6T disk
└─sdd1 4.6T linux_raid_member part
└─md1 4.6T ext4 raid1 /srv
Thank you for help.
Sure you can.
did you create FS on a md1?
How you mount it?
Have you an error when you mount it manually via
sudo mount /dev/md1 /srv
Just send a bit more info, e.g. output from:
lsblk
mount | grep -w "md[0-9]"
df -H | grep -E "md[0-9]|srv"
Hi @gas85,
FS is on md0 500GB SSD and the 5TB raid is md1 and i will use it as data storage for nextcloud.
I edited the post above there is the structure of my disks.
noob question 
:
when i mount md1 5TB to the FS md0 /srv than i set when i install Nextcloud a data storage path to the /srv it will be used as 5TB disk?
Thank you for your help.
But here it is mounted to the /srv. Please check it via:
df -H /srv
One point here, your /boot/efiis not a part of any RAID, this means if sdb fails you will not be able to boot anymore. I check tutorial and it looks like you have to create RAID for each folder:
you’ll need to create separate partitions and make a RAID1 device for /boot.
https://help.ubuntu.com/community/Installation/SoftwareRAID#Configuring_the_RAID
There is a way to move it with keeping a data, but looks a bit dangerous for beginners:
sl@cloud:~$ df -H /srv
Filesystem Size Used Avail Use% Mounted on
/dev/md1 5.0T 93M 4.8T 1% /srv
now when i point nextcloud to /srv than it takes md1 /srv?
i create there a dir named /srv/Nextcloud/data.
For the /boot/efi i can reinstall ubuntu and make it mirrored im just learning and it is a good point i managed to make raid1 and excluded from it the bootloader. Stupid 
Thank you for your time.
Please note: Raid is NO backup.
Thank you all for help, i really appreciate it.