MatzeHali

Hi there, I'm trying to find a sweet spot for a ZFS configuration with 15 disks and potentially a level 2 ARC, and thus, am benchmarking around a bit. Configuration is a 16core XEON with 144GB of RAM, 15 WD RED 14TB drives, a 1TB EVO970 NVME and 10GBE ethernet connectivity. I access via Samba with MacOSX. While trying different RAID-Z configurations, with trying 16GB write once, read multiple times scenario: Writing directly to the NVME as a single drive pool (for testing only) I can reach 880MB/s. Reading from that same place multiple times I get 574MB/s. Writing to a 2x7raidz1 I'm getting write speeds at about 760MB/s, but the exact same read speeds of 574MB/s. Since the file is easily small enough to fit in the ARC, I would assume, latest with the second read it comes from RAM, so I doubt the read speeds on the box are the problem. So, my question is, why is my read speed somehow capped at 574MB/s? MTU-size is configured to 9000 and SMB-signing is switched off, I don't have any other ideas to try. Thanks, M

Awesome, thanks. I'll try to have some kind of extensive testing scenario before I go into any production state, so I'll report back if I had any reliability problems and hopefully with an extensive performance comparison between raidz2 configurations and a corresponding draid vdev, not only with rebuild times, which definitely will be much faster, but also with IO-performance. Cheers, M

Dear Steini84, thanks for enabling ZFS support on UnRAID, which makes this by far the best system for storage solutions out there, having the chance of creating ZFS pools of any flavour and the possibility of an UnRAID-pool on the same machine. I'm just starting to do testing on my machine, and stumbled over dRAID-vdev-driver documentation and was interested, if there was a possibility if you could include the option for this one in your build? I know, for ZFS-standards, this is far from production ready software, but since I'm testing around, I'd be really interested what performance gains I'd get with an 15+3dspares draid1 setup compared to a 3x 4+1 raidz1 vdev-pool, for example. Thanks. M