[SOLVED] Why the XFS partitioning layout?

[dataprolet]

Can someone explain me why Proxmox automatically partitioned my 256 GB SSD like it did using XFS?

12345678910sdc 8:32 0 238.5G 0 disk
├─sdc1               8:33   0  1007K  0 part
├─sdc2               8:34   0     1G  0 part /boot/efi
└─sdc3               8:35   0 237.5G  0 part
├─pve-swap       253:0    0   7.6G  0 lvm  [SWAP]
├─pve-root       253:1    0  69.5G  0 lvm  /
├─pve-data_tmeta 253:2    0   1.4G  0 lvm 
│ └─pve-data     253:4    0 141.5G  0 lvm 
└─pve-data_tdata 253:3    0 141.5G  0 lvm 
└─pve-data     253:4    0 141.5G  0 lvm

What is sdc1 for? Why 1 GB for /boot? Why 70 GB for /root? And waht is pve-data_tmeta in comparison to pve-data_tdata?

 

[LnxBil]

it did using XFS?

XFS? Where is XFS in your output?

What is sdc1 for?

That is your internal disk

Why 1 GB for /boot?

It's EFI and it is for multiple kernels and initrd. That's normal.

Why 70 GB for /root?

Because you did not specify otherwise.

And waht is pve-data_tmeta in comparison to pve-data_tdata?

That is your thin-LVM pool consisting of data and metadata.

 

[dataprolet]

XFS? Where is XFS in your output?

I selected XFS as a filesystem when installing Proxmox.

That is your internal disk

No it's not, it's a 1007K partition for no apparent reason.

Because you did not specify otherwise.

So the installer is rolling a dice to determine the size? This surely is based on something, a ratio, that's what I'm asking for.

That is your thin-LVM pool consisting of data and metadata.

So tdata is for data and tmetadata for metadata and both partitions are thin provisioned and therefore showing 141,5 GB of free space?

 

[aaron]

Partition 1 is for padding AFAIU, please correct me if I am wrong.
Partition 2 is for booting in UEFI mode, as already explained by @LnxBil
Partition 3 contains LVM which is split into swap, root FS, storage for guests. The root FS is either ext4 or xfs, depending on what you choose. The storage for guests is a thin LVM to enable thin provisioning and snapshots of the guests.

If you had selected ZFS during the installation, partition 3 would have been used for the ZFS pool, multiple disks or a single, depending on the redundancy you selected.

The size for the LV containing the root FS (pve-root) is a percentage of the overall disk size.

You can control the sizes of the LVs and overall used size of the disk with a few parameters during installation, see https://pve.proxmox.com/pve-docs/pve-admin-guide.html#advanced_lvm_options for more details.

 

[dataprolet]

Thanks, I probably overlooked the parameters to specify the size of the partition during installation.