SSD Raid 1 Dell Perc H730P

[plastilin]

Hello everyone. There was a question about the Trim function for SSDs in Proxmox. Is it necessary and how to configure it? In my case, Raid 1 is built on the 2 SSDs. Are there any recommendations for optimization inside Proxmox itself or maybe inside virtual machines stored on SSDs.

 

[Dominic]

Have you already found an answer? There are some options that you can set on your host for the disks of the virtual machines: https://pve.proxmox.com/pve-docs/pve-admin-guide.html#qm_hard_disk_discard

 

[plastilin]

My data sotorage configured as lvm thin. Guest system now Windows Server 2008 R2 and Windows 7. Virtual controller set as Virtio SCSI. Does is correct? Or i may setup another controller type?

 

[Alwin]

Virtual controller set as Virtio SCSI. Does is correct?

This one support TRIM, but the VM still needs to send TRIM (discard) commands.

 

[plastilin]

I check of one server by command

fsutil behavior query DisableDeleteNotify

and result is DisableDeleteNotify = 0 Thats signalling of TRIM is enable. Does i need emulate SSD for guest? Or just activate discard in options VM?

 

[Dominic]

Some guest operating systems may also require the SSD Emulation flag to be set.

And Windows is one of those.

Update: Seems like I was wrong. I just tested this on an lvm-thin storage: Two Windows 10 VMs, each with a disk with SCSI and discard=on but only one VM/disk with SSD emulation. On both VMs deleting a big file instantly led to a decreased Mapped size in lvdisplay for the logical volume. Additionally, in their drive options both Windows installations report the drive to be suitable for thin provisioning.

 

[plastilin]

Ok. If i correctly understanding Proxmox may direct access to diks. If disks configured as Raid, not HBA - TRIM/Disacard will be not working?

 

[Alwin]

Ok. If i correctly understanding Proxmox may direct access to diks. If disks configured as Raid, not HBA - TRIM/Disacard will be not working?

This is up to the RAID controller and may be configurable on the controller itself.