That sounds more like the result I expected, maybe there's something wrong with my disk or server (other disks perform fine, though). Paul Paul On Fri, Feb 22, 2019 at 8:25 PM Jacob DeGlopper <jacob@xxxxxxxx> wrote: > > What are you connecting it to? We just got the exact same drive for > testing, and I'm seeing much higher performance, connected to a > motherboard 6 Gb SATA port on a Supermicro X9 board. > > [root@centos7 jacob]# smartctl -a /dev/sda > > Device Model: Samsung SSD 883 DCT 960GB > Firmware Version: HXT7104Q > SATA Version is: SATA 3.2, 6.0 Gb/s (current: 6.0 Gb/s) > > [root@centos7 jacob]# fio --filename=/dev/sda --direct=1 --sync=1 > --rw=write --bs=4k --numjobs=1 --iodepth=1 --runtime=60 --time_based > --group_reporting --name=journal-test > > write: IOPS=15.9k, BW=62.1MiB/s (65.1MB/s)(3728MiB/60001msec) > > 8 processes: > > write: IOPS=58.1k, BW=227MiB/s (238MB/s)(13.3GiB/60003msec) > > > On 2/22/19 8:47 AM, Paul Emmerich wrote: > > Hi, > > > > it looks like the beloved Samsung SM/PM863a is no longer available and > > the replacement is the new SM/PM883. > > > > We got an 960GB PM883 (MZ7LH960HAJR-00005) here and I ran the usual > > fio benchmark... and got horrible results :( > > > > fio --filename=/dev/sdX --direct=1 --sync=1 --rw=write --bs=4k > > --numjobs=1 --iodepth=1 --runtime=60 --time_based --group_reporting > > --name=journal-test > > > > 1 thread - 1150 iops > > 4 threads - 2305 iops > > 8 threads - 4200 iops > > 16 threads - 7230 iops > > > > Now that's a factor of 15 or so slower than the PM863a. > > > > Someone here reports better results with a 883: > > https://www.sebastien-han.fr/blog/2014/10/10/ceph-how-to-test-if-your-ssd-is-suitable-as-a-journal-device/ > > > > Maybe there's a difference between the SM and PM variant of these new > > disks for performance? (This wasn't the case for the 863a) > > > > Does anyone else have these new 883 disks yet? > > Any experience reports? > > > > Paul > > _______________________________________________ > > ceph-users mailing list > > ceph-users@xxxxxxxxxxxxxx > > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > _______________________________________________ > ceph-users mailing list > ceph-users@xxxxxxxxxxxxxx > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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