Search results for query: PLP

With SSDs without PLP, it's common that data is lost by an unexpected power loss as they shuffle data around (like trim and flushing SLC cache to TLC/QLC flash) all the time. This is not specific for ZFS but can happen with all filesystems. I don't know why it would happen with a HDD but maybe...

...after my first boot only! The are new. Until then i band all WD Drives from my systems and use Seagate IronWolf NAS Drive 5.600 RPM and PRO with 7.200 RPM. If you have 2 more SATA III connectors, the please set up with 2x SSD, PLP and DRAM Cache a zfs mirror special device for this hdd zfs pool.

Yes, and I learned that the hard way. In 2025, I thought that ZFS, which was being promoted everywhere, would be able to replace a hardware RAID card that was several years old. I also thought it was a good candidate for mdadm, which I had also used in the same type of configuration. ZFS may be...

RAID5 (with BBU) is almost, but not quite, entirely unlike RAIDz1 (with drives without PLP): https://forum.proxmox.com/threads/fabu-can-i-use-zfs-raidz-for-my-vms.159923/post-734643

...will do, and will not really impact performance since all they are being used for is to load the OS and record logs. Many people talk about plp this and enterprise that, but there is very little benefit for OS drives. 4. Depending on your answers for 1 and 2, dont be so quick to discount...

...2x Kingston DC600M 480 GB with ZFS mirror for the Proxmox host - 3x Kingston DC600M 960 GB for the VMs in a RAIDZ1 This is the cheapest SSD with PLP i found. Speed of the SATA SSD is more than enough. His old server runs on HDDs only and performance was never a problem. He knows that it's...

...work without any problems ;) For your current issue I would however strongly recommend to: Buy used enterprise ssds with power-loss-protection (PLP is important! You can filter for it on geizhalz.at to get an idea for which models to look ) Backup as much as possible (maybe after fixing...

I did use the installation wizard (clicked on ceph on all 3 nodes where the install automatically popped up and went through the installation process). That's the first thing I did before creating any of the other ceph components. I can try to remove all the OSDs, monitors and the pool again...

Thanks a lot

...use the PVE installation wizard? The monitor "maintains a master copy of the cluster map." I would imagine doing it the other way could result in OSDs not connected to the system...? re: SSDs, yes it can make a big difference, search the forum for enterprise (drives with PLP) vs consumer SSDs.

No, sorry. Some search engines support to filter for (for example) "M.2 with PLP", e.g. this German one: https://geizhals.de/?cat=hdssd&xf=7156_Power-Loss%20Protection~7177_M.2%202230~7177_M.2%202242~7177_M.2%202260~7177_M.2%202280~7177_M.2%2022110&offset=0&promode=true

...motherboard (last bios & BMC) EPYC 9475F 48C / 96C HT processor 12x DDR5 ECC REG 6400 FSP Pro Twins 2x930w power supply 4x NVME Gen5 Enterprise (PLP) Kingston DC3000ME 7.86 TB (spec: https://www.kingston.com/en/ssd/dc3000me-data-centre-solid-state-drive? Capacity=7.68tb ) Cooling AIO + 4x Fan...

Do you have a recommendation for an nvme drive with PLP?

No, that's the wrong workaround for a well known symptom. The correct (and possibly more expensive) solution is to use "Enterprise Class, with PLP" devices for ZFS. (And probably for all CoW filesystems.) PLP will give you two things: endurance and performance in terms of IOPS for "sync...

This cannot be stressed enough. A used enterprise SSD with PLP does not cost more then 40 euro on ebay, just buy it and spend your lifetime on something better.

I don't think there's any workaround other than using an SSD that supports PLP. I recommend buying an SSD rather than wasting time worrying about it.

You can decrease the wearout per time if you use a device with PLP - actually writing data to the hardware cells is going to happen more infrequent. Unfortunately the A400 series lacks this feature. Additionally PLP will increase the performance of synchrone writes drastically.

...and random reads improved at lot. I've been mixing drives in ZFS mirror using consumer and enterprise HDD, consumer SSD and enterprise SSD (with PLP) and it all worked (well enough as can be expected). Then again, I've been using ZFS mirrors for some time and maybe it's been sub par and I...

Yes. And yes. It has been discussed so many times... I won't repeat the arguments. Yes. I must admin that in my Homelab all of my NVMe lack PLP (while nearly all SSDs have it). For my $Dayjob cluster I would never do so. Yes, NVMe has a much higher IOPS (and bandwidth) than SATA, but the...

...)) If you do anything valuable you might consider "one disk for this, one disk for that" and go for redundancy. While this won't count as a backup it makes losing data much harder. Go for two "Enterprise Class" (with PLP!) SSD/NVMe and select "ZFS mirror" during installation. Just my 2 €¢...