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.openst...@gmail.com] Sent: Sunday, August 30, 2015 5:19 PM To: Somnath Roy Cc: ceph-users@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....@sandisk.com<mailto:somnath....@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.openst...@gmail.com<mailto:longlq.openst...@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. ________________________________ PLEASE NOTE: The information contained in this electronic mail message is intended only for the use of the designated recipient(s) named above. If the reader of this message is not the intended recipient, you are hereby notified that you have received this message in error and that any review, dissemination, distribution, or copying of this message is strictly prohibited. If you have received this communication in error, please notify the sender by telephone or e-mail (as shown above) immediately and destroy any and all copies of this message in your possession (whether hard copies or electronically stored copies).
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