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Also, disable firewall if there is any while you are trying to connect to cluster, you may later enable it.

Well, its leased server so no issue, I can with better one soon.

A regular KVM with Alma8.7 and cpanel. Used free -h or top

top inside as well on host.

Its evident that it eats lots of RAM however, if I see disk io wait on host, its almost zero.

I just noticed that if I enabled writeback cache, VM is using a lot more memory than shown inside vm. eg. currently VM is using only 1.6 GB RAM but if I check process, its about 33 GB. I then disabled writeback and after a while I found that VM is showing about 2GB inside and process is about...

Ya, that is understood to stay away from QLC ssds however,why reads are also bad ?

Before this experience, I didn't know with SSDs I am going to have such headache. So had issue with ZFS, I switched to mdraid, still in issue, what could be the solution ?

That is a nice piece of info. Considering that I have 1TB drives, probably have 50GB+ SLC cache (75GB actually) so tests must be faster, specially reads must be significantly faster. I am suspecting my md+lvm has something not right.

I am not sure how does it affects here. As far as have read, LVM also allows you to create RAID arrays without mdadm but they are not ideal. Moreover if I am creating a RAID10 partition using mdraid then it should not really matter anything to LVM if underline PV is mdraid device or a regular...

Had not done secure erase before proxmox install . These are relatively new devices actually : I do understand these are consumer grade SSD but even in raid10, no zfs,its very bad. Is there any chance that my setup is of raid+lvm has some issue ?

I got few server where have consumer grade SSDs, earlier was using ZFS but apparently apart of good amount of RAM, ZFS also need enterprise SSD with some inbuilt cache / fault protection. So I built next server with mdraid and LVM thin (for snapshot features). But my benchmarks are terribly...

Yes, its basic cpanel with low traffic website, no way it can use that much memory. So what was causing that usage, Do you suggest that write-back can eat that much RAM ?

Thanks, yes, swap is enabled and I heard some swap helps you to keep linux stable even if you have plenty of unused RAM. It would be helpful if someone can make understand why it is happening, is it stack in VM or its host node itself ?

Hi, I found that only VM on server is going down randomly. From dmesg, I can find : [Thu Mar 23 02:51:34 2023] Out of memory: Killed process 538560 (kvm) total-vm:125506644kB, anon-rss:113157280kB, file-rss:3988kB, shmem-rss:4kB, UID:0 pgtables:237624kB oom_score_adj:0 [Sun Mar 26 05:09:06...

I was planning to do that but then SATA method worked which I explained already.

As you may see, had tried multiple ways and still failed. May be I am missing something small. May be someone else with similar experience can shed some light on it.

Update 2: I installed using SATA and then added secondary SCSI virtio disk in windows, windows installed some own drivers for it. Now from config, changed main disk type from SATA to SCSI, and it works. What is happening here is that virtio drivers from Redhat are not working ?

Update: If I use "SATA" mode for disk, I can install windows but as per guide (https://pve.proxmox.com/wiki/Windows_10_guest_best_practices) and also I know from experience that virtio I gives better performance. So how do I go with virtio based disk ?

I am trying to install windows 10 on proxmox VM. However, after updating virtio drivers, I am receiver error "windows can't be installed on drive 0 partition 1. I was following this : https://pve.proxmox.com/wiki/Windows_10_guest_best_practices Screenshot : I also tried with other win 2022...