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
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