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List:       ceph-users
Subject:    [ceph-users] Fwd: [Ceph-community]Improve Read Performance
From:       Somnath.Roy () sandisk ! com (Somnath Roy)
Date:       2015-08-31 7:25:07
Message-ID: 755F6B91B3BE364F9BCA11EA3F9E0C6F2CE2EF9A () SACMBXIP01 ! sdcorp ! global ! sandisk ! com
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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 at gmail.com]
Sent: Sunday, August 30, 2015 5:19 PM
To: Somnath Roy
Cc: ceph-users at lists.ceph.com
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 at \
sandisk.com<mailto:Somnath.Roy at sandisk.com>> 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

On Aug 30, 2015, at 4:33 AM, Le Quang Long <longlq.openstack at \
gmail.com<mailto:longlq.openstack at gmail.com>> wrote:

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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