extend pve 4.2 with raid6

[Mr.Gosh]

i installed a second server next to our old pve 4.1 machine for extended testing of cluster systems.

to achive that i installed pve on a ssd and after isntallation and setup I created a raid6 via mdadm out of 5 3tb hdds.

i mounted these into /var/lib/vz - to be able to move the .qcow2 storage vms from our old (4.1) machine over to this one...

Is there a problem with this setup?
Is there a possibility to use thios storage for .qcow2 AND thin lvm?

...or should we create an lvm on the raid6 to be able to use thin lvm next to .qcow2?

 

[wolfgang]

Hi,

This setup is ok.
If you like to use ThinLVM and Qcow2,
then create a VG on top this md-raid and make a separate lv for /var/lib/vz and one for LVM-Thin.

 

[Mr.Gosh]

is there a "best pratice" on how to setup both (lv & lvm-thin)?

 

[Mr.Gosh]

worked well, at first i created a volumegroup that owns the whole raid6:

vgcreate pve-raid /dev/md0

than I created a logical volume for the qcow2 based VMs using 50% of the space:

lvcreate -l50%VG -n data pve-raid

than I created a logical volume that used 50% of the volumegroup for the thin-lvm:

lvcreate -l50%VG --thinpool thin-pool pve-raid

than I created an ext4 filesystem on "data":

mkfs.ext4 /dev/pve-raid/data

after that i mounted the "data" pool somewhere to copy the present filestructure from /var/lib/vz over to the new filesystem:

mount /dev/pve-raid/data /mnt/raid6/
cp -Rp /var/lib/vz/* /mnt/raid6/
mount /dev/pve-raid/data /var/lib/vz
umount /mnt/raid6

than i added the raid to the fstab and let it mount:

printf "\n/dev/pve-raid/data   /var/lib/vz   ext4   defaults   0   2\n" >> /etc/fstab
mount -a

I checked if everythign seems fine:

mount
ls -lah /var/lib/vz
df -h

PLEASE DO MORE TESTING!!!
but if you see the "LOST+FOUND" Folder you look are looking to the new storage... ;-)

and umounted the itermediate mountpoint:

umount /mnt/raid6

I am happy with this solution... "lvdisplay" gives me two new volumes I can work with - everythign else can be done through the webinterface...