RaptorBeaver

Thanks for your answer. When I create a pool with only one NVMe i get the full speed...

Interesting, what could be the difference ? I go to the pool folder in /mnt/…. I directly pv file > /mnt/destinationpool/file thanks

Hi guys, I have 2 ZFS pool. ZFS Pool (A) : 4x NVMe samsung 990 pro 2TB drives (ZFS RAID0) ZFS Pool (B) : 15x SATA SSD samsung 870 evo 4TB drives (1x vdev / RAIDZ1) connected via HBA 9500 16i card. The rest of the configuration is pretty powerful so no limitation with the CPU and co. I tried everything. But regarding the configuration it's very slow. When i open a shell in unraid and try to cp / pv files between Pool (A) to Pool (B) (So no network, no SMB and co) I get something like... 600 MB/s. When i try to use dd with bs 4M i get 725 MB/s. When i try to copy via SMB on a 10gbe connection on Pool (A) or (B) i get 1GB/s speed... Sounds crazy. (Thanks JorgeB to help me in another thread to play with Disk Shares and co, fixed the smb thing). Thanks for helping

When I try to copy files between those 2 pools with unraid CLI i get 400MB/s with rsync and 650MB/s with pv... Definetely don't understand. Driving me crazy

My CPU is a AMD EPYC 7402... Because if i can only get this kind of speed it will be more effective in terms of cost to send ssd back and get somme mechanical HDD... With 15x mechanical HDD the speed will be basically the same....

I don't understand... while i'm trying to move files from one ZFS pool (nvme raid0 x4) to other pool (ssd raidz1 x15) netdata tell me that my max speed is 2GB/s... In this case it's not about the network and not about SMB... Seems very slow regarding the setup of both pool....

Thanks itimpi

Thanks JorgeB, i tried some dd commands, i get 9GB/s reading and 5GB/s writing so i guess the pool is working well i need to tune my smb. Still waiting for my 25GB NIC that's why i try to push more speed, because basically you're write with 10gbe it's useless to have this kind of pool. I try to understand how exclusive shares and disk shares works, the documentation is very small regardins that, do you have some readings about it ? Just to understand what changed ? Thanks for your help

Thank you so much for your quick reply After enabling exclusive shares I get almost 1GO/s on the NVMe pool and on the SSD pool. Better but i do not saturate my 10gbe link...

Hello, I have 15x SSD 870 evo plugged to an HBA 9500 16i card. I have configured a zfs pool in RAIDz1 with only 1 vdev. I get via SMB 500mo/s with a 10gbe link. I also have a synology with 8x HDD RAID5 + NVMe caching, with the same client i get 1,2go/s.... I try to create a ZFS pool with 4x NVMe in raid0 and i get 600mo/s..... What am i missing please ?

Thanks a lot

Yes understood.... What do you recommand in terms of vdev design if i put 15x SSD disk together as a pool ? I'm hesitating between having 15x SSDs and 3 vdev so 3 parity disks and having 14x SSDs and 2x 7 disks vdev with 2 parity disks

Thanks, So basically with this output i can considere i only have 1 vdev ? pool: mypool state: ONLINE config: NAME STATE READ WRITE CKSUM mypool ONLINE 0 0 0 /dev/nvme2n1p1 ONLINE 0 0 0 /dev/nvme3n1p1 ONLINE 0 0 0 /dev/nvme0n1p1 ONLINE 0 0 0 /dev/nvme1n1p1 ONLINE 0 0 0 errors: No known data errors

Thanks a lot for your reply, how can I see vdevs in unraid ? Because for now i can add pool see differents pools, disks etc, but i cannot find the vdev identification/definition...

Hello guys, New to unraid and i love it ! I read a lot of documentation about ZFS... I created a ZFS Pool with 2 slot nvme drives in raid0 and i have some questions... - I add 2 disk (same than 2 first ones) by switching the number of slot from 2 to 4... I had no problem... I thought we cannot expand zfs pools so i don't understand why does it work...? - I read that if we don't have multiple vdevs with ZFS we don't cumulate speed... The max speed is the speed of the fastest disk. Is that true with unraid ? - I see no information regarding vdevs with ZFS Pool in unraid... How does it works ? Regarding my previous question if i want to get max speed of my pool i need to be able to configure my vdevs... For this pool it's not really important because it is a small pool just for performance without any parity but i plan to put a lot of ssd together in another pool with parity and i wanted to know before that what will happen regarding expandability, performance, vdevs and co... Sorry to bother you with theses simple questions but the unraid manual part regarding ZFS is pretty small... Thanks a lot