Well, tried a different disk and basically got the same results as Jacob. So I've just had a bad disk there (server was fine as other disks work in it). Paul -- Paul Emmerich Looking for help with your Ceph cluster? Contact us at https://croit.io croit GmbH Freseniusstr. 31h 81247 München www.croit.io Tel: +49 89 1896585 90 On Sun, Feb 24, 2019 at 8:55 PM Paul Emmerich <paul.emmerich@xxxxxxxx> wrote: > > 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
 |