Recent content by Dd9

For me, it was a problem because without TRIM, the performance was much worse, it went from 1.5 GB/s to 500 MB/s. I don't know why.

https://forum.proxmox.com/threads/sas-disk-array-and-discard-option.87901/ A similar problem occured to me with a Dell ME4024 array, from the same series. It seem to be indeed a problem with discard and the array. Contrary to what I've said in the thread, I could in the end replicate the problem...

New test : I tested the array directly with QEMU/KVM with Ubuntu 20.04 and the corruption did not happen. Thin provisionning worked. I have created a SCSI device with discard=unmap. So it seems to be related to Proxmox.

After more investigation: It is not caused by multipath because it happens with LVM volumes on a single path. There is a huge performance difference between discard being On vs Off : 2 GB/s vs 500 Mb/s. Why does discard impact so much performance ? It is as if discard acts as a cache option...

Hello, I have set up a fresh install of an HA cluster of 3 identical servers with Proxmox. Kernel Version Linux 5.4.106-1-pve #1 SMP PVE 5.4.106-1 (Fri, 19 Mar 2021 11:08:47 +0100) PVE Manager Version pve-manager/6.3-6/2184247e We have a Dell ME4024 disk array. I configured the disk array...