OCR / VD external vs. normal redundancy using NFS.
- From: David Robillard <david.robillard@xxxxxxxxx>
- To: oracle-l mailing list <oracle-l@xxxxxxxxxxxxx>
- Date: Wed, 16 Jun 2010 10:43:51 -0400
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
--
//www.freelists.org/webpage/oracle-l
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