Date: Sat, 22 Jul 2017 22:24:36 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 211713] NVME controller failure: resetting (Samsung SM961 SSD Drives) Message-ID: <bug-211713-8-MCvClcHIeh@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-211713-8@https.bugs.freebsd.org/bugzilla/> References: <bug-211713-8@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=211713 --- Comment #37 from stb@lassitu.de --- [root@foo ~]# diskinfo -t /dev/nvd0 /dev/nvd0 512 # sectorsize 128035676160 # mediasize in bytes (119G) 250069680 # mediasize in sectors 0 # stripesize 0 # stripeoffset S347NY0HB01730 # Disk ident. Seek times: Full stroke: 250 iter in 0.014551 sec = 0.058 msec Half stroke: 250 iter in 0.015022 sec = 0.060 msec Quarter stroke: 500 iter in 0.029067 sec = 0.058 msec Short forward: 400 iter in 0.015134 sec = 0.038 msec Short backward: 400 iter in 0.015675 sec = 0.039 msec Seq outer: 2048 iter in 0.063374 sec = 0.031 msec Seq inner: 2048 iter in 0.057973 sec = 0.028 msec Transfer rates: outside: 102400 kbytes in 0.094174 sec = 1087349 kbytes/sec middle: 102400 kbytes in 0.089065 sec = 1149722 kbytes/sec inside: 102400 kbytes in 0.089141 sec = 1148742 kbytes/sec I think I should be getting 2.2GB/s. With 4 concurrent dd's, gstat shows: [root@foo ~]# gstat -I60s -f '^....$' dT: 60.002s w: 60.000s filter: ^....$ L(q) ops/s r/s kBps ms/r w/s kBps ms/w %busy Name 4 13578 13578 1737975 0.3 0 0 0.0 100.0| nvd0 [root@foo ~]# for i in 0 1 2 3; do dd if=/dev/nvd0 of=/dev/null bs=1m count=100k & done; wait; echo 'done' [1] 41520 [2] 44578 [3] 46696 [4] 47833 102400+0 records in 102400+0 records out 107374182400 bytes transferred in 192.262522 secs (558476927 bytes/sec) [1] Done dd if=/dev/nvd0 of=/dev/null bs=1m count=100k 102400+0 records in 102400+0 records out 107374182400 bytes transferred in 241.421031 secs (444759026 bytes/sec) [2] Done dd if=/dev/nvd0 of=/dev/null bs=1m count=100k 102400+0 records in 102400+0 records out 107374182400 bytes transferred in 241.552144 secs (444517613 bytes/sec) [3]- Done dd if=/dev/nvd0 of=/dev/null bs=1m count=100k 102400+0 records in 102400+0 records out 107374182400 bytes transferred in 241.559861 secs (444503412 bytes/sec) [4]+ Done dd if=/dev/nvd0 of=/dev/null bs=1m count=100k done So I'm guessing the penalty is not too big. The 128 GB model has a significantly lower write speed compared to the 256GB and 512GB models (around 800MB/s I believe), so I didn't test that. -- You are receiving this mail because: You are the assignee for the bug.help
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