RE: OCR / VD external vs. normal redundancy using NFS.
Date: Thu, 1 Jul 2010 07:31:38 +0200
Message-ID: <4814386347E41145AAE79139EAA398980E776A58E9_at_ws03-exch07.iconos.be>
I'm usually using the normal redundancy, putting each voting disk / cluster registry in its own volume. You might want to read http://freekdhooge.wordpress.com/2009/11/03/two-oracle-rac-bugs-on-the-wall-two-oracle-bugs-take-one-down/. Because of this "bug" I needed to switch to iscsi for the cluster registry volumes. It is probably still valid with 11gR2
Regards,
Freek D'Hooge
Uptime
Oracle Database Administrator
email: freek.dhooge_at_uptime.be
tel +32(0)3 451 23 82
http://www.uptime.be
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-----Original Message-----
From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of David Robillard
Sent: woensdag 16 juni 2010 16:44
To: oracle-l mailing list
Subject: OCR / VD external vs. normal redundancy using NFS.
Hello everyone,
I'd like to know how does each of us configure redundancy for both the Grid Infrastructure's Oracle Cluster Registry (OCR) and Voting disks (VD) when they're stored over NFSv3 on an enterprise grade storage array with RAID disks. Do you use external or normal redundancy for OCR and VD?
I'm looking to install Grid Infrastructure 11gR2 on RedHat Enterprise Linux 5 x86_64 over NFSv3 on a clustered Sun/Oracle Unified Storage 7410. The storage array has built-in redundancy on every components. Each cluster node has two quad-ethernet network interface cards (NIC). All network interfaces are built with two ports, one on each NIC, to create a private (bond0), public (bond1) and storage (bond2) interface. There are two redundant GbE switches dedicated for a storage-only non-routable subnet.
Quick note, I'm not using ASM over iSCSI for various reasons. Mostly because every paper I read from NetApp/Sun/Oracle/EMC says the performance of ASM with software initiator iSCSI is not as good as NFS. Also because it's easier to manage the storage array's total disk space when using NFS instead of iSCSI. I'm also not using Oracle's dNFS feature simply because I haven't had the time to look at it and I've been working with NFS for over 10 years. Plus I'm also lucky (?) enough to be the UNIX sysadmin, the storage array administrator and the DBA, so I don't need to configure everything from the Oracle stand-point (i.e. I can't do finger pointing in case things go wrong, I'm the only one to blame).
With that in mind, which option would you choose and why?
Option A)
Create an NFS share for OCR and another one for VD then use external redundancy. That would generate the following mount points:
OCR = /u01/ocr/cluster.registry
VD = /u01/vd/voting.disk
-or-
Option B)
Create three different NFS shares for OCR and three other shares for VD then use normal redundancy. That would create the following mount points:
OCR 1 = /u01/ocr/ocr1/cluster.registry OCR 2 = /u02/ocr/ocr2/cluster.registry OCR 3 = /u03/ocr/ocr3/cluster.registry VD 1 = /u01/vd/vd1/voting.disk
VD 2 = /u02/vd/vd2/voting.disk
VD 3 = /u03/vd/vd3/voting.disk
Of course there are other options and variations. I welcome all comments and critics on that setup :)
Many thanks,
David
--
David Robillard, UNIX team leader and Oracle DBA
CISSP, RHCE, SCSA & SCSECA
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Received on Thu Jul 01 2010 - 00:31:38 CDT