RE: oracle rac 10g and OS clusterware.
- From: "John Hallas" <john.hallas@xxxxxxxxxx>
- To: <dannorris@xxxxxxxxxxxxx>, <ujang.jaenudin@xxxxxxxxx>, "Peter McLarty" <peter.mclarty@xxxxxxxxxxxxxxxxxx>
- Date: Wed, 5 Dec 2007 14:21:09 -0000
Good response Dan. How often does node eviction take place on a 'normal'
configuration (if there is such a thing).
PS I came across an excellent presentation of yours this morning on HA
options for Oracle
http://www.dannorris.com/wp-content/uploads/2007/11/ha-options-for-oracl
e-db-oow2007-slides.pdf
John
________________________________
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Dan Norris
Sent: 05 December 2007 03:32
To: ujang.jaenudin@xxxxxxxxx; Peter McLarty
Cc: oracle-l@xxxxxxxxxxxxx
Subject: Re: oracle rac 10g and OS clusterware.
Ujang,
Oracle Clusterware 10g will always handle node fencing (aka eviction) by
rebooting one or more nodes. Oracle didn't have it's own cluster manager
software for most platforms on 9i. So, if your customer was on a
platform where Oracle didn't have a cluster manager of its own (it only
had Linux and Windows), then building the RAC cluster would have
required some 3rd party software. Some of the 3rd party cluster managers
used different schemes to fence nodes from the cluster. Many of them
used I/O fencing which was somewhat less disruptive in that it didn't
require a node reboot, but required more proprietary interfaces to be
used to access and manage storage.
The answer to your question is that it depends. You will always have to
have Oracle Clusterware if you're building a 10g cluster. However, if
you additionally use a 3rd party clusterware (one that uses I/O fencing
instead of reboots to handle node eviction), Oracle Clusterware will not
handle cluster membership and therefore won't impose its "reboot the
other node" scheme of node eviction. I should mention that I believe
this is true in most cases, but not all cases.
If you use just Oracle Clusterware (which is the only requirement and
handles all cluster management needs albeit with using node reboots to
evict them from the cluster), you'll be subject to node reboots if node
eviction is required.
See Kirk McGowan's post on Oracle Clusterware's node eviction methods at
http://blogs.oracle.com/kmcgowan/2007/08/09#a13 for some additional
insight.
Dan
The information included in this email and any files transmitted with it may
contain information that is confidential and it must not be used by, or its
contents or attachments copied or disclosed, to persons other than the intended
addressee. It must not be used by, or its contents or attachments copied or
disclosed to, any persons other than the intended addressee. If you have
received this email in error, please notify BJSS.
In the absence of written agreement to the contrary BJSS’ relevant standard
terms of contract for any work to be undertaken will apply.
Please carry out virus or such other checks as you consider appropriate in
respect of this email. BJSS do not accept responsibility for any adverse
effect upon your system or data in relation to this email or any files
transmitted with it.
BJSS Limited, a company registered in England and Wales (Company Number
2777575), VAT Registration Number 613295452, Registered Office Address, First
Floor, Coronet House, Queen Street, Leeds, LS1 2TW
Other related posts:
