Search results for query: QLC ZFS

=1&c[nodes][0]=16&o=date']Search the forum for QLC and you will find that ZFS does not work well with those kind of drives. Other filesystems also have issues on sustained writes but ZFS with sync writes and write amplification always runs into trouble. Everybody who buys QLC drives creates a...

That would reduce sync writes and write amplification (but you lose most features that I like, such as mirroring and checksums). I've used consumer TLC flash drives for ZFS (expecting them to wear quickly but accelerate a HDD mirror) and it works well, and endures longer than expected, for some...

=1&c[nodes][0]=16&o=date']Search the forum for QLC and you will find that ZFS does not work well with those kind of drives. They might have good reviews for consumer/games but Proxmox VE is a clustered enterprise hypervisor. Lots of threads with suggestions to use (second-hand) enterprise drives...

I've been setting up a new Windows 11 guest and struggling to debug poor I/O performance within the guest. Qualitatively, "real usage" I/O performance in the guest seems sluggish, with apps launching slowly and operations that are snappy on similarly spec'd non-virtualized Windows devices...

Whether this is a good approach depends a on the type of drives (which you apparently don't want to share) and not the ZFS pool layout. Please make sure to keep additional copies of the data and at least one in another place. PBS has remote sync which is perfect for that. That also possible...

Maybe show the output of zpool status for the VMS pool (in CODE-tags)? Are you using SMR or QLC drives? Maybe we can find out the actual problem with your physical zpool and suggest improvements?

Yes, use (second-hand) enterprise SSDs with PLP and you'll also get the other benefits and features of ZFS. There are already so many threads about ZFS, write amplification, QLC flash memory and Power Loss Protection on enterprise drives; please use the search with these or similar terms...

Usually better compatibility than for any transceiver, but if at all, that is not a Proxmox, but a hardware/driver issue. And do yourself a favor and refrain from consumer SSDs - especially QLC ones - they wear out at an amazing rate. You will want to use CEPH or ZFS, which are copy-on-write...

Thx will check the thread later. While enterprise ssd would surely help it just doesn't explain the abysmal performance. I have 8 consumer ssds in my main pc as madadm raid6 -> 7000MB/s write speed. There's something wrong when you have virtual disks on a zfs raid in proxmox.

https://forum.proxmox.com/threads/very-slow-vm-on-dell-r620.164605/post-761270 and maybe also use enterprise SSDs with PLP instead of SSDs with QLC flash memory? EDIT: You keep on comparing RAID5/6 with RAIDz1/2, which you should not do as they are entirely different. Please read the thread and...

Ich gehe davon, dass SSD, NVMe "gestorben" sind, evtl. sind dort QLC Datenspeicher implementiert. Für ZFS VDEV funktioniert auf lange Sicht Kingston DC600M. Crucial MX500 haben viele gute Eigenschaften nur zu wenige TWB und sind nun ausgelistet. ADATA Ultimate SU800 verwende ich in einigen...

What do you mean from time to time? I am not using ZFS for boot, i have ZFS on my second 1 tb SSD, but the OS is on the main drive (a 128 GB M2 SATA III). Yea, i know what QLC is and my Crucial BX500 is indeed QLC. That's why i want 3 nodes in a cluster with a Raid 5 (3 ZFS pools for each...

That one uses QLC flash memory, which can become slower than an old HDD when doing sustained writes. There have been previous problems reported with it (but it might be with ZFS). I'm not sure about that old model Those are pretty old models but at least MLC (no experience at all).

It's an (consumer) SSD that uses QLC flash memory: https://en.wikipedia.org/wiki/Multi-level_cell#Quad-level_cell Try the forum search: https://forum.proxmox.com/search/8262617/?q=QLC&t=post&c[child_nodes]=1&c[nodes][0]=16&o=date Best to use (second-hard) enterprise SSDs with PLP, which is also...

By QLC SSD do mean any SSD or is this a specific type of SSD? I was thinking about getting 2 250 GB SDD's for the OS in an ZFS mirror and 2 2TB ones in an ZFS mirror for LXC and VMs is there something I should be looking for or are you saying I need to stick with CSM spinning drives?

Please don't replace them with a 4TB QLC SSD that looks like a good deal; you'll get into the same kind of troubles. People refuse to believe that they wasted their money to only get single-digit KB/s (sustained) writes and time-outs and errors with ZFS, but it has happened multiple times before...

Will do @leesteken thanks. I have already order a temporary drive (tlc nand) to test and if everything is find I will invest in an enterprise level drive. QLC is really bad but I did not realize that it could be so bad..

Please check your memory. In case of ZFS, yes, this would give (write) errors/time-outs for sure (on the host). On ext4/LVM, I would expect writes dropping to tens of KB/s but not errors. QLC flash becomes much slower than old HDDs (maybe even like old floppy speeds) when doing big/sustained...

Hi @leesteken, no errors on hosts at all. Host is only being slowed down and then recovers after a while. Only the VMs are affected. Some need only reboot, some need to be restored from backup since they are getting so corrupted that can not even boot afterwards. But this only happens when I try...

The BX500 has terrible write performance and is slow but should not give errors (except time-outs with ZFS because of the use of QLC flash). You are getting real I/O errors (on the host). It could be a drive or cable or controller or memory or motherboard or CPU issue. Try replacing each part...