Hi,
On 4/9/21 19:19, Leandro Roggerone wrote:
Hi guys , after install a new storage to my box , had to create lvm-thin.
Im not very good with lvm , after reading some docs , and links like:
https://forum.proxmox.com/threads/how-to-create-an-lvm-thinpool-and-vz-directory-on-the-same-disk.62901/
I got a working solution but have also some questions about it.
This is what I did:
wipefs -a /dev/sdb
sgdisk -N 1 /dev/sdb
pvcreate --metadatasize 1024M -y -ff /dev/sdb1
vgcreate --metadatasize 1024M proxvg /dev/sdb1
lvcreate -l 100%FREE --poolmetadatasize 1024M --chunksize 256 -T -n
proxthin proxvg
lvcreate -n proxvz -V 1.1T proxvg/proxthin
mkfs.ext4 /dev/proxvg/proxvz
mkdir /media/vz
echo '/dev/proxvg/proxvz /media/vz ext4 defaults,errors=remount-ro 0 2' >>
/etc/fstab
mount -a
And have following result:
root@pve2:~# lvs
LV VG Attr LSize Pool Origin Data% Meta%
Move Log Cpy%Sync Convert
proxthin proxvg twi-aotz-- 1.63t 22.03 6.34
proxvz proxvg Vwi-aotz-- 1.10t proxthin 1.67
root@pve2:~# lvdisplay
--- Logical volume ---
LV Name proxthin
VG Name proxvg
LV UUID 4cEIr9-3ZVQ-vsy1-q9ZX-GsaD-7oq0-pZixsX
LV Write Access read/write
LV Creation host, time pve2, 2021-04-01 13:09:41 -0300
LV Pool metadata proxthin_tmeta
LV Pool data proxthin_tdata
LV Status available
# open 3
LV Size 1.63 TiB
Allocated pool data 22.03%
Allocated metadata 6.34%
Current LE 428451
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:2
--- Logical volume ---
LV Path /dev/proxvg/proxvz
LV Name proxvz
VG Name proxvg
LV UUID huzpPT-g0Gd-3Jwb-2ydz-InHh-73vN-Jnc5TR
LV Write Access read/write
LV Creation host, time pve2, 2021-04-01 13:10:12 -0300
LV Pool name proxthin
LV Status available
# open 1
LV Size 1.10 TiB
Mapped size 1.67%
Current LE 288359
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:4
Have following comments:
I can create VMs on proxthin partition so it is ok.
I can create backup on proxvz partition so it is ok.
Looks OK imho.
What im concerned about is:
Physic storage space is about 1.8TG , how is it possible to create a 1.6
and 1.1T volumnes inside ?
LVM Thin is 'thin-provisioned' it only uses space when it is really written.
It can be a problem in the future ?
yes, if you do not monitor your real usage, if the thinpool runs full,
you can lose data.
I was thinking about reduce proxthin partition to 600Gb aprox , so it make
same sense 1.1T + 600G aprox 1.8 T
But there is no LV Path on proxthin partition so I can unmount and the
reduce.
So ..
What im missing here ? do I need to reduce proxthin partition ( I do need
the 1.1T partition to backup).
the LV 'proxvz' is inside the thinpool 'proxthin' so as long as you
never allocate more that ~500GiB of vm/ct volumes, it should be fine.
alos, on allocation, the thinpool will print warnings if the allocated
lvs are bigger than the space available
hope this helps
Hope to be clear about this guys.
Any comment would be wellcome.
Leandro.
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