Re: Is nfs reliable?
- From: Jeremy Schneider <jeremy.schneider@xxxxxxxxxxxxxx>
- To: "napacunningham@xxxxxxxxx" <napacunningham@xxxxxxxxx>
- Date: Fri, 3 Jun 2016 12:37:08 -0400
On Fri, 3 Jun 2016 08:02:29 -0700 Michael Cunningham wrote:
Sherrie, can I ask a question for my own curiosity?
Do you have ORACLE_HOME mounted on a storage device? Is it mounted
using nfs? I know of a few Oracle DBA's doing this and it has worked
well for them. They like the ease of upgrades and just switching
homes.
On Fri, 3 Jun 2016 15:34:04 +0000 Robert Freeman wrote:
We Run our RAC databases using NFS as the shared media for datafiles.
We have yet to have a failure because of NFS. We don’t use shared
software directories however, just local directories. My personal
preference is for local software.
I would second Robert's statement here. I have managed environments
with shared homes on shared storage. The db binaries didn't cause too
much trouble and I've heavily used the "switching-home" upgrade method
with both local and shared homes. It is slick. However oracle *does*
have a lot of log files scattered around - and I do think it's pretty
critical to get log files on a device that's least likely to fail. That
means local disk. Not even a single-server dedicated mountpoint backed
by shared storage. I had issues at one time with shared storage and all
log files were on local mountpoints backed by the problematic SAN
itself... so logs didn't get written. Shortly after that we moved
everything to local storage.
Of course, you've now got a more complicated space management picture
with putting multiple GB of software on each db servers' local disk in
the data center. Moving the diagnostics destination to local storage
will catch the most important log files for database homes. I would
strongly recommend to avoid putting grid infrastructure software on any
mountpoint that's backed by a NAS or SAN... a number of important log
files are hard coded to the GI home and it sucks to troubleshoot when
you have no logs.
Just a few thoughts on that topic based on my experiences... not
specific to NFS but applicable to any network storage :)
-J
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