Hi Guys,
I read all Ceph documentation more than twice. I'm now very
comfortable with all the aspect of Ceph except for the strategy of using
my SSD and HDD.
Here is my reflexion
I've two approach in my understanding about use fast SSD (900 GB) for my
primary storage and huge but slower HDD (4 TB) for replicas.
FIRST APPROACH
1. I can use PG with cache write enable as my primary storage that's
goes on my SSD and let replicas goes on my 7200 RPM.
With the cache write enable, I will gain performance for my VM
user machine in VDI environment since Ceph client will not have to wait
for the replicas write confirmation on the slower HDD.
SECOND APPROACH
2. Use pools hierarchies and let's have one pool for the SSD as primary
and lets the replicas goes to a second pool name platter for HDD
replication.
As explain in the Ceph documentation
rule ssd-primary {
ruleset 4
type replicated
min_size 5
max_size 10
step take ssd
step chooseleaf firstn 1 type host
step emit
step take platter
step chooseleaf firstn -1 type host
step emit
}
At this point, I could not figure out what approach could have the most
advantage.
Your point of view would definitely help me.
Sincerely,
Martin
--
Martin Catudal
Responsable TIC
Ressources Metanor Inc
Ligne directe: (819) 218-2708
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