Search results for query: PLP

I don't known who as recommend you tu use consumer ssd with zfs or ceph, but performance will be horrible. (because lack of power-loss protection, so the fsync for the zfs/ceph journal can't be cached). pm1643 (or any other enterprise ssd with plp) should works fine.

Thank you very much! That answered the question for me. One more thing I could not figure out, yet: How large does the SLOG SSD need to be? Looks like some decent size like 512G will be plenty. Is that correct? Cheers Max

...use I would never choose consumer SSDs for anything. They are a total different thing and not suitable for ZFS loads. It's not only about the PLP (power loss protection) but also the much larger cache and how writes are done. A setup of enterprise SSDs in a striped mirror can be sufficient...

Und falls das einen neu zu teuer ist: Selbst gebraucht halten die länger als neue Consumer-SSDs

...bekommen, ist das nicht auszuschließen, auch wenn nicht so Wahrscheinlich. Wenn du aber dein Special Device verlierst, hast du gar keine Daten mehr, daher bin ich da lieber vorsichtiger. Bei geizhals kannst du einen Filter für PLP setzten, die restlichen Filter musste du selbst wählen. Mit PLP

...geringfügig besser als eine normale Consumer SSD ist. Nur der Preis ist da deutlich unterschiedlich. ;) Wenn du eine SSD haben möchtest, welche mit ZFS lange hält, entweder eine richtige Enterprise SSD nehmen, oder wenigstens auf PLP (Power Loss Protection) achten. Dann halten die auch viele...

...Alternative (if you have no big budget) would be used enterprise drives. Beside Samsung, Intel and Micron are Kingston‘s DC drives. For 13 VMs I would prefer a striped mirror setup (aka RAID1+0). Depending on your workload you could add 2x NVME with plp as a mirrored SLOG to your striped mirror.

...of a mirror. And even though you do not want to hear it: all Solid-State devices used for this kind of use case should be "Enterprise Class" with PLP. Disclaimer: I do not use RaidZ for PVE anywhere = not tested by me; (nearly) all my SSDs have PLP; none of my NVMe has PLP - in my Homelab!

if you will do this "zpool upgrade", then login as root an your Server, with host the zfs pool "tank". But, your ssd "Teamgroup T-Force Vulcan Z 480 GB" has noch PLP or DRam cache. It might slowdown your sync write of 4 k blocks.

That's only one aspect. Then there is the rise in performance... No. If one fails then you replace it. Without data loss. That's the whole point of redundancy, isn't it? With a RaidZ1/RaidZ2/RaidZ3 you get the performance of a single drive. And you may possibly find that you can store less...

...the SSDs yet, but most likely they won't. This is very much an experimental/lab setup, not even "home production". I understand to get PLP for anything important or not on a UPS. I suppose losing a drive if all five drives (including /boot) is one big pool is problematic? Not even sure...

...including storing of VMs. Correct. The recommendation is clearly "mirrors". More problematic is that you probably do not have NVMe without PLP, right? Actually I do use them too, in my Homelab. But the recommendation is clear here too: always use "Enterprise Class SSDs with PLP" - and...

...did you run "fio" with a comparable large chunk of testdata to confirm this? how is the Pool organized? (Mirrors?) is it "Enterprise SSDs" with PLP? A cheap consumer SSD may not be able to write with 200 MB/s for more than some handful of seconds... Disclaimer: just guessing - you gave...

Good morning all. I have setup a 5 node cluster with Ceph. I made sure to buy enterprise SSDs that have PLP and I am still getting slow performance. About 1200 MB/s without load and about 600 MB/s under load. I have read online that my raid controller is causing the bottle neck. But I have not...

Do note the last sentence ;) Yes, I use(d) consumer SSDs like that for ZFS cache and ZIL/SLOG in that exact manner as the PLP to gain some performance boosts "needed" You are right w.r.t. the coalescing/etc. but that also adds costs that is not always required... but when you are in that...

...the IOPS. But no, I do not know if that is a sufficient solution for your problem in your use case. If @LnxBil is right and those SSDs lack PLP everything is suboptimal, at least for usage as VM storage. The other approach is to add a "Special Device", consisting of two (small, below 1...

...(two data plus that single SD) are identical. This way any two devices may fail. Just to be sure: those SSDs should be "Enterprise Class" w/ PLP. Good luck. Possible limitation: I am NOT sure if the effective IOPS of two spindles plus the SD for metadata will work on the long run, as all...

It's much more than that. A PLP drive will return ACK to the OS/app once that is written in the cache because PLP will allow that data to be written to the chips no mater what happens (OS panic, app crashes, power loss, hardware failure, etc). Of course, assuming that firmware isn't buggy. That...

Data integrity (PLP) and high endurance is what I expect from an enterprise SSD. Something like this: SMART/Health Information (NVMe Log 0x02) Critical Warning: 0x00 Temperature: 40 Celsius Available Spare: 100% Available Spare...

Well, tell that to everyone on this forum calling for the use of "enterprise SSD" with ZFS. I only thought of this question after seeing the 28% remaining lifespan on my consumer SSDs.