Re: NFS on a 10g RAC cluster

Well, for every good experience, there's an equally compelling bad experience 
lurking somewhere I suspect. While I've known many successful deployments of 
NFS supporting Oracle DBs (apparently, you're one of them), I haven't been so 
lucky. I have seen many problems and have avoided it whenever possible in the 
last several years. So, my information may be a little dated and maybe I should 
take another look. I've never found a compelling argument FOR using NFS for 
Oracle and it's always seemed to be near equal in cost to the iSCSI solutions 
that I've had good luck with in the past few years. So, when there has been a 
decision to make, I've usually suggested using iSCSI instead of NFS and that's 
worked well in my experiences. 

So, I wouldn't refuse to work on a system using NFS, it would just be my 2nd 
choice when there are other options (and there usually are).

Dan

----- Original Message ----
From: D'Hooge Freek <Freek.D'Hooge@xxxxxxxxx>
To: "dannorris@xxxxxxxxxxxxx" <dannorris@xxxxxxxxxxxxx>; 
"krish.hariharan@xxxxxxxxxxxx" <krish.hariharan@xxxxxxxxxxxx>; 
"Jon.Crisler@xxxxxxx" <Jon.Crisler@xxxxxxx>
Cc: Oracle-L Freelists <oracle-l@xxxxxxxxxxxxx>
Sent: Monday, December 10, 2007 4:08:39 PM
Subject: RE: NFS on a 10g RAC cluster


Dan,

If I understood Jon's original question correctly, he does not want to
 place his datafiles on nfs, but instead setup an nfs server on one of
 the rac nodes and he wanted to know if there was a way to let the nfs
 server failover from one rac node to the other.

BTW, Is there any particular reason why you are not a fan of putting
 Oracle databases on NFS? I must say I have rather good experiences with
 it.


regards,

Freek D'Hooge
Uptime
Oracle Database Administrator
e-mail: freek.dhooge@xxxxxxxxx
tel. +32 (0)3 451 23 82
http://www.uptime.be
disclaimer


From: oracle-l-bounce@xxxxxxxxxxxxx [oracle-l-bounce@xxxxxxxxxxxxx] On
 Behalf Of Dan Norris [dannorris@xxxxxxxxxxxxx]
Sent: 10 December 2007 22:59
To: krish.hariharan@xxxxxxxxxxxx; Jon.Crisler@xxxxxxx
Cc: Oracle-L Freelists
Subject: Re: NFS on a 10g RAC cluster


I'm not a fan of putting Oracle DBs on NFS. Furthermore, as this list
 shows:
 
http://www.oracle.com/technology/products/database/clustering/certify/tech_generic_unix_new.html,
 only a relatively small handful of specialized NFS appliances/software
 are supported for RAC. That is, you can't take the typical UNIX NFS
 server implementation and use it to run RAC in a supported way. If you
 don't care about support and just want to build a sandbox, it may work
 fine--I've used OpenFiler for sandboxes and it worked well for my
 functional (not load) testing.

Dan


----- Original Message ----
From: "krish.hariharan@xxxxxxxxxxxx" <krish.hariharan@xxxxxxxxxxxx>
To: Jon.Crisler@xxxxxxx
Cc: Oracle-L Freelists <oracle-l@xxxxxxxxxxxxx>
Sent: Monday, December 10, 2007 1:37:46 PM
Subject: Re: NFS on a 10g RAC cluster

Jon,

From discussions with a Unix architect, I understood that read-write
 nfs
has some holes that our security teams did not like. We however use
 read
only nfs routinely in many environments. The issues were:
1. Security did not like us using nfs, especially read-write
2. In our Solaris environments, in some older OS releases, stale nfs
mounts were problematic.

A question though: Is there a reason why you wouldn't have the nfs
 mounts
on all nodes of the RAC and perhaps control access to that mount point
through, say the services framework as opposed to failing the mount
 point
to different nodes?

-Krish

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