Hi i have a Intel Optane: INTEL-SSDPEL1K100GA-E2010450-93.16GB
running this under latest ESXi 6.7 and OI Hipster 2020-04 with Passthrough. General information Name NVMe Datacenter SSD [Optane] Device ID 2701 Subdevice ID 3907 Class ID 108 Vendor Name Intel Corporation Vendor ID 8086 Subvendor ID i was trying to use this as SLOG device, was very promising but after adding it to the pool, the pool wasn't acception IO after a while... so switched back to my SAS SSD and pool was immediately fast again. I created a test pool on that device and did a quick and dirty test to a filesystem with compression=off: while true; do dd if=/dev/zero of=/dummy/testfil bs=8k count=10240 oflag=sync; done now i can see that after some good numbers with >100MB/Sec IO drops to zero, this comes back after a minute or more then again some writes are going to the device and IO stops again and again in cycles. # zpool iostat dummy 1 capacity operations bandwidth pool alloc free read write read write ---------- ----- ----- ----- ----- ----- ----- dummy 500M 92.5G 0 1.10K 9.63K 14.6M dummy 443M 92.6G 0 8.29K 0 99.4M dummy 443M 92.6G 0 8.92K 0 107M dummy 443M 92.6G 0 8.68K 0 104M dummy 780M 92.2G 0 8.85K 0 124M dummy 780M 92.2G 0 8.83K 0 106M dummy 780M 92.2G 0 8.98K 0 108M dummy 780M 92.2G 0 8.64K 0 104M dummy 780M 92.2G 0 9.16K 0 110M dummy 780M 92.2G 0 761 4.00K 61.4M dummy 780M 92.2G 0 0 0 0 dummy 780M 92.2G 0 0 0 0 dummy 780M 92.2G 0 0 0 0 dummy 780M 92.2G 0 0 0 0 dummy 780M 92.2G 0 0 0 0 dummy 780M 92.2G 0 0 0 0 dummy 780M 92.2G 0 0 0 0 dummy 780M 92.2G 0 0 0 0 dummy 780M 92.2G 0 0 0 0 dummy 780M 92.2G 0 0 0 0 dummy 780M 92.2G 0 0 0 0 dummy 780M 92.2G 0 0 0 0 dummy 780M 92.2G 0 0 0 0 dummy 780M 92.2G 0 0 0 0 dummy 780M 92.2G 0 0 0 0 dummy 780M 92.2G 0 0 0 0 dummy 780M 92.2G 0 0 0 0 dummy 780M 92.2G 0 0 0 0 dummy 780M 92.2G 0 0 0 0 dummy 780M 92.2G 0 0 0 0 dummy 780M 92.2G 0 0 0 0 dummy 780M 92.2G 0 0 0 0 dummy 780M 92.2G 0 0 0 0 dummy 780M 92.2G 0 0 0 0 dummy 780M 92.2G 0 0 0 0 dummy 780M 92.2G 0 0 0 0 This behavior is not there if i Passthrough that device to a Linux or Windows VM on the same physical ESXi machine. Any known issue? Heiko ------------------------------------------ illumos: illumos-discuss Permalink: https://illumos.topicbox.com/groups/discuss/T2dae243fee8d6880-Mbc5dfddee5e4639219f80ddd Delivery options: https://illumos.topicbox.com/groups/discuss/subscription
