Not much suggestion from my side (I never ran Ceph on complete HDDs), other than probably running more OSDs/HDDs. More OSDs should help specially if you can
spread these on many nodes.
I would say try with fio-rbd (librbd) first (rbd_cache = false) as it may give you some boost over kernel rbd since the TCP_NODELAY patch is probably not in
yet with krbd. But, I doubt how significant it is in the HDD world.
Thanks & Regards
Somnath
From: Le Quang Long [mailto:longlq.openstack@xxxxxxxxx]
Sent: Sunday, August 30, 2015 5:19 PM
To: Somnath Roy
Cc: ceph-users@xxxxxxxxxxxxxx
Subject: Re: [ceph-users] Fwd: [Ceph-community]Improve Read Performance
Yes, I will use Ceph RBD as shared Storage for Oracle Database Cluster, so I need high I/O read write random. With 3 nodes and 24 SAS 15K 1TB, what is the most optimized solution to get it ?
On Aug 31, 2015 2:01 AM, "Somnath Roy" <Somnath.Roy@xxxxxxxxxxx> wrote:
And what kind of performance are you looking for?
I assume your workload will be small block random read/write?
Btw, without SSD journal write performance will be very bad specially when your cluster is small..
Sent from my iPhone
Thanks for your reply.
I intend use Ceph RBD as shared storage for Oracle Database RAC.
My Ceph deployment has 3 nodes with 8 1TB 15k SAS per node, I do not have SSD at the moment, so I design every SAS will be Journal and OSD.
Can you suggest me a way to get highest performance for Oracle Cluster with this deployment?
Many thanks.
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