No, if you used cache tiering, It is no need to use ssd journal again.
From: Florent MONTHEL
Date: 2015-01-17 23:43
To: ceph-users
Subject: [ceph-users] Cache pool tiering & SSD journal
Hi list,
With cache pool tiering (in write back mode) enhancement, should I keep to use
SSD journal on SSD ?
C
Here are a few values commonly used:
Less than 5 OSDs set pg_num to 128
Between 5 and 10 OSDs set pg_num to 512
Between 10 and 50 OSDs set pg_num to 4096
If you have more than 50 OSDs, you need to understand the tradeoffs and how to
calculate the pg_num value by yourself
But i think 10 OSD is to s
Hi everyone:
I used writeback mode for cache pool :
ceph osd tier add sas ssd
ceph osd tier add sas ssd
ceph osd tier cache-mode ssd writeback
ceph osd tier set-overlay sas ssd
and i also set dirty ratio and full ratio:
ceph osd pool set ssd cache_target_dirty_ratio .4
ceph osd pool s
Hi everyone:
I plan to use SSD Journal to improve performance.
I have one 1.2T SSD disk per server.
what is the best practice for SSD Journal ?
There are there choice to deploy SSD Journal
1. all osd used same ssd partion
ceph-deploy osd create ceph-node:sdb:/de
more better performance.
From: lidc...@redhat.com
Date: 2015-01-12 12:35
To: ceph-us...@ceph.com
Subject: SSD Journal Best Practice
Hi everyone:
I plan to use SSD Journal to improve performance.
I have one 1.2T SSD disk per server.
what is the best practice for SSD Journal
