Useful file system for UCS5 on Proxmox

UCS - Univention Corporate Server
1

Hi@all,

I chose a UCS environment on Proxmox for my project work. So far, I have always created the partition layout in UCS (guest) as follows:

/dev/sda1		ext4	100GB		/           noatime nodiratime
/dev/sda2		XFS 	100GB		/var
/dev/sda3		XFS 	100GB		/home       rw,noatime,nodiratime,attr2,inode64,noquota    0       0
/data/sdb1      XFS     XXX         /data01     rw,noatime,nodiratime,attr2,inode64,noquota    0       0

The storage pool on the PVE is an HBA with 4 x 4TB SSDs as ZFS (RAID5).

I would like to configure the system in the VM for maximum throughput. Is the layout OK or is there room for improvement?

with best
sven

2

Since XFS is optimal for larger data, I formatted /, /var and /home with ext4 and /data01 with XFS. I now have the following layout:

UUID=57c2a85c-1c9c-4d91-9ebd-7e1c3e71cd33       /       ext4    discard,noatime,nodiratime,errors=remount-ro    0       1
UUID=42c1c555-27ac-4d83-86c4-1d86da69dd4d       /data01 xfs     noatime,relatime        0       0
UUID=a09b399b-4b5d-4746-b6e2-bd1cf06a0e75       /home   ext4    discard,noatime,nodiratime      0       2
UUID=a5a815d7-3551-498d-b3d3-a69a6e528931       /var    ext4    discard,noatime,nodiratime      0       2

My tests in the UCS-VM showed:

root@srv01:~# dd if=/dev/zero of=/root/testfile bs=512K count=1000 oflag=direct
1000+0 Datensätze ein
1000+0 Datensätze aus
524288000 bytes (524 MB, 500 MiB) copied, 0,381033 s, 1,4 GB/s
root@srv01:~# dd if=/dev/zero of=/root/testfile bs=4096 count=10000 oflag=direct
10000+0 Datensätze ein
10000+0 Datensätze aus
40960000 bytes (41 MB, 39 MiB) copied, 0,424101 s, 96,6 MB/s
root@srv01:~# dd if=/dev/zero of=/data01/testfile bs=1G count=100 oflag=direct
100+0 Datensätze ein
100+0 Datensätze aus
107374182400 bytes (107 GB, 100 GiB) copied, 135,032 s, 795 MB/s
root@srv01:~# dd if=/dev/zero of=/data01/testfile bs=30M count=100 oflag=direct
100+0 Datensätze ein
100+0 Datensätze aus
3145728000 bytes (3,1 GB, 2,9 GiB) copied, 1,65142 s, 1,9 GB/s

I think that’s ok? or should I use other options with dd?

3

Hi,

what is your goal you want to achieve? If you want to test the HDD/SSD, its better to have a look at hdparm or bonnie++.

Regards

4

I would like to test how much data throughput I lose from the pre-virtualization host (PVE) to the VM (UCS) or optimize this as far as possible :slight_smile:

Thanks, I will have a look and test it.