I understand that my SSD is not suitable for journal. I want to test ceph using
existing components before buy more expensive SSD (such as intel dc s3700).
I run fio with those options:
[global]
ioengine=libaio
invalidate=1
ramp_time=5
iodepth=1
runtime=300
time_based
direct=1
bs=4k
size=1m
file
The drive you have is not suitable at all for journal. Horrible, actually.
"test with fio (qd=32,128,256, bs=4k) show very good performance of SSD disk
(10-30k write io)."
This is not realistic. Try:
fio --sync=1 --fsync=1 --direct=1 --iodepth=1 --ioengine=aio
Jan
On 23 Oct 2015, at 16:3
Hello.
Some strange things happen with my ceph installation after I was moved journal
to SSD disk.
OS: Ubuntu 15.04 with ceph version 0.94.2-0ubuntu0.15.04.1
server: dell r510 with PERC H700 Integrated 512MB RAID cache
my cluster have:
1 monitor node
2 OSD nodes with 6 OSD daemons at each server
