[ceph-users] NVME Intel Optane - same servers different performance

Martin Verges martin.verges at croit.io
Thu Oct 25 08:59:54 PDT 2018


Hello Steven,

are you sure that the systems are exact the same? Sometimes vendors
place extension cards into different PCIe slots.

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2018-10-25 17:46 GMT+02:00 Steven Vacaroaia <stef97 at gmail.com>:
> Hi,
> I have 4 x DELL R630 servers with exact same specs
> I installed Intel Optane SSDPED1K375GA in all
>
> When comparing fio performance ( both read and write), when is lower than
> the other 3
> ( see below - just read)
>
> Any suggestions as to what to check/fix ?
>
> BAD server
> [root at osd04 ~]# fio --filename=/dev/nvme0n1 --direct=1 --sync=1 --rw=read
> --bs=4k --numjobs=100 --iodepth=1 --runtime=60 --time_based
> --group_reporting --name=journal-test
> journal-test: (g=0): rw=read, bs=(R) 4096B-4096B, (W) 4096B-4096B, (T)
> 4096B-4096B, ioengine=psync, iodepth=1
> ...
> fio-3.1
> Starting 100 processes
> Jobs: 100 (f=100): [R(100)][100.0%][r=2166MiB/s,w=0KiB/s][r=554k,w=0
> IOPS][eta 00m:00s]
>
>
> GOOD server
> [root at osd02 ~]# fio --filename=/dev/nvme0n1 --direct=1 --sync=1 --rw=read
> --bs=4k --numjobs=100 --iodepth=1 --runtime=60 --time_based
> --group_reporting --name=journal-test
> journal-test: (g=0): rw=read, bs=(R) 4096B-4096B, (W) 4096B-4096B, (T)
> 4096B-4096B, ioengine=psync, iodepth=1
> ...
> fio-3.1
> Starting 100 processes
> Jobs: 100 (f=100): [R(100)][100.0%][r=2278MiB/s,w=0KiB/s][r=583k,w=0
> IOPS][eta 00m:00s]
>
>
> many thanks
> steven
>
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