Search results for query: QLC

=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...

...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 workloads. I do not want to use QLC so I really can't comment on your...

=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...

...of different configurations now in an attempt to isolate the most relevant variable: different NVMe drives, swapping out the Corsair P3 Plus QLC drive I'd initially repurposed for a Samsung 990 PRO, without significant improvement, VM images on ZFS vs LVM with both thin and thick...

...of the data and at least one in another place. PBS has remote sync which is perfect for that. That also possible (but please don't use SMR or QLC drives). Alternatively, install PBS as a container (instead of a VM) and you can use the PVE storage directly (and avoid ZFS on ZFS). Or install...

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?

...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. There are alternatives like...

SMR is for rotating HDDs these are TLC-flash SATA SSDs. QLC-flash is terrible with sustained writes (go down to KB/s) but most TLC-flash consumer drives work "well enough" for homelabs (but I have no experience with Ceph). Try (second-hand) enterprise SSDs with Power Loss Protection (PLP) as...

...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 file systems, so swap will be the least of your...

Naja, die QLC hat deutlich bessere Leseperformance was beim Verify und Restore von Vorteil ist.

Also für Backups würde ich lieber ne Festplatte als QLC benutzen ...

Jetzt wo ich deinen Screenshot sehe. eine QLC SSD solltest du eh auf keinen Fall für einen Hypervisor nutzen. Die sind beim schreiben noch langsamer als HDDs. Außerdem verschleißen die bei Serverworkload um ein vielfaches schneller. Für Backups oder einen Office PC kann man die QLC SSDs benutzen.

Thanks Markus for your input. Converting the cluster to SSD. Will let you know the outcome.

...minimum and should only be used for testing / evaluation / home labs - hdd's are slow, you should really use ssd's nowadays (with plp, dont use QLC ssd's) - 10Gbit is the bare minimum, every write to disk has to be send over the network to other nodes so this could be your main bottleneck...

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...

Lots of threads on this forum about problems with QLC SSDs including that particular one. EDIT: My advise would be to use the search.

That's what I tried to say before. Consumer SSDs (like your QLC drive, which is terrible for VMs by the way!) can lose all data easily on unexpected power loss as it moves "data at rest" around (including the drive's internal data allocation tables). I cannot explain that, sorry. There have...

...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 secondary 1 TB SSD from each...