![]() ![]() Samsung SSDs earn their own reputation due to high performance, better techniques and long warranty time. is one of the most popular SSD manufacturers over the world. I have to admit, I'm not familiar with the help an NVMe slog might provide, I'll go do some reading.Samsung Corp. I find it odd that the two drives that are slow have serial number formats far different than the other 6 SSD's. da0-da1 still exhibited the same higher latency / disk busy %age.ĭelete latency for da0-da1 seem to be 2-3x higher than the rest of the drives (da2-da7 averages 1.2 ms, da0-da1 averages over 3). Gptid/cd4b50cf-9733-11e7-bd11-74867ae04eaa -Īll drives were new and installed at same time, although I tried a different configuration first - 2 4-drive RAIDZ1 sets. NAME SIZE ALLOC FREE EXPANDSZ FRAGĜAP DEDUP HEALTH ALTROOTĭATASSD 3.62T 884G 2.76T -đ5%Ē3% 1.00x ONLINE /mnt ZFS pool set up as 4 groups of mirror pairsġ0GbE twinax to switch, 10 GbE twinax to compute nodesĪ.b.c.d:/mnt/DATASSD/NAS-VMD on /mnt/pve/NAS-VMD type nfs (rw,relatime,vers=3,rsize=131072,wsize=131072,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,mountaddr=a.b.c.d,mountvers=3,mountport=x,mountproto=udp,local_lock=none,addr=a.b.c.d) I'm finding that the performance of the installation is not where I expect it, and I can't seem to get maximum performance from the configuration - on a "dd if=/dev/zero of=/mnt/DATASSD/NAS-VMD/freenas/outfile bs=1M count=262144", gstat shows da0 and da1 as 80%+ busy while the rest of the drives are only 30% busy.ģ2 GB RAM, 8x Samsung 850 EVO 1TB SSD's on Dell PERC controller flashed to "IT" (passthrough) mode ![]() ![]() Problem: 2 of the SSD's (da0,da1) report high "disk busy" numbers compared to the other 6 (da2 through da7) for the same amount of load. I'm seeing a bit of weirdness and I'm unsure of whether it's causing me some problems with performance. ![]()
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