Search results for query: SMR

ok i will read about SMR vs CMR disk, i was under impression for nas you need WD RED or iron wolf nas drive

Also keep in mind that your disk (WD40EFAX) isn't suited for ZFS. It's a SMR disk which shouldn't be used with ZFS. You need a CMR disk. So for example a WD "Red Plus" or WD "Red Pro" but no normal "WD Red". What is ls -la /dev/disk/by-id now reporting? Does a third partition still exist?

Could be worse. PBS could run as a VM using ZFS on top of ZFS ;) But yes...thats nearly the worst setup you could imagine for IOPS performance.

...does not fit PBS. Or is there an actual question/problem, I missed? It is btw also no wonder, since you stack up all the worst things that are possible: Not only HDDs, but even SMR-HDDs connected through USB with not only ZFS on top, but even ZFS-raidZ and using this with millions of small...

...* https://arstechnica.com/gadgets/2020/05/zfs-versus-raid-eight-ironwolf-disks-two-filesystems-one-winner/ * https://arstechnica.com/gadgets/2020/06/western-digitals-smr-disks-arent-great-but-theyre-not-garbage/

...and setup everthing again from scratch in case a disk fails. And if you care about data integrity. And check if the HDD models are using CMR or SMR. And if the SSDs got a power-loss protection or not and what type of NAND hey are using (QLC, TLC, ...). I would highly recommend to...

What make and model are your drives? If they use SMR then they might slow down too much after a while and be marked problematic by ZFS. zpool status (whose output when errors occur would be very useful) would show write errors in that case. If it shows different error counts (or CMR drives)...

Could you please be more specific about the model of the drives? The reason I ask is because you generally need good datacenter drives for ZFS or Proxmox VE in general, a consumer grade (in contrast to datacenter grade) SMR HDD will quickly fill its cache and become extremely slow.

A short guideline: - SMR HDDs -> avoid at all cost - CMR HDDs -> only useful as additional cheap cold storage - QLC SSDs -> avoid whenever possible - TLC conumer SSDs -> might be fine for a low demanding small consumer grade homeserver with ext4/LVM - Enterprise/Datacenter SSD with power-loss...

QLC SSDs are little IOPS and with sustained write perform worst than spinning harddrives (except for SMR harddrives). Please search the forum. I'm a stranger on the internet, what do I know, maybe your experience with QLC drives might be great.

WD60EFAX is an SMR drive and cannot handle sustained writes and is therfore not suitable for ZFS (or NAS in general, even though WD claims it is). Please search the forum for issues with SMR drives. In case of WD, you need Red Plus instead of Red. EDIT: You are getting ZFS write errors because...

Shingled platters are expected to produce problems with ZFS earlier or later. You can find several threads describing the problem here and on other places. Just try everything to not use them... Good luck!

...FW:83.00A83, 2. Aug 13 08:12:08 silver smartd[976]: Device: /dev/sdb [SAT], found in smartd database: Western Digital Red (SMR) Aug 13 08:12:08 silver smartd[976]: Device: /dev/sdb, type changed from 'scsi' to 'sat' Aug 13 08:12:08 silver smartd[976]: Device: /dev/sdb [SAT], opened Aug 13...

At least that's not what i see on my side, maybe i am lucky in my mistake indeed, but still right now, i can tell that after 10TB transferred of the VM disk the bandwidth is still steady at 340MB/s, which is honest from my perspective. when the setup was with the 12 disks in Raid10, i ended up...

...doing short small bursts of writes. No matter if it is random or sequential. Maybe your disk models aren't that bad, but I for example owned a SMR HDD that dropped from ~160MB/s down to the very low KB/s or even B/s range when doing something like extracting a 50GB zip file. And yes, with...

In 2,5" you don't find any consumer HDD with that capacity, or at least i couldn't find any by myself. I agree with you, tendency in computers is to go for cheap and bad ... so sad. I tried already this and was able to perform sequential write on 2 HDD of the lot over the entire drive keeping a...

...CMR HDDs. Try to write something like 1TB of media at once. Performance should significantly drop once the CMR cache is full. Problem with SMR disks is not only that it might get unusable slow. The latency then might become that bad, that ZFS thinks the disks failed, because they can't answer...

...{ print $1 " " $3 / 1048576 }' < /proc/spl/kstat/zfs/arcstats size 64330.6 - Disks are Seagate Barracuda SATA 5TB 2,5" ST5000LM000 and yes, are SMR based :-( So obviously, the disks are definitely not enterprise grade and SMR based which according to what you are saying are terrible in...

...your ~100 IOPS are the bottleneck, even wh3n doing sequential writes? And did you verify before buying the disks, that these use CMR and not SMR, as the write performance with shingled magnetic recording will be terrible and should be avoided with ZFS at all cost. CPU isn't too weak and...

SMR is not good for ZFS (or NAS in general) and you might want/need to replace the drive for a CMR one (Red Plus). Please search the forum for SMR problem reports.