After split brain has been detected, one node will always have the resource in a StandAlone connection state. The other might either also be in the StandAlone state (if both nodes detected the split brain simultaneously), or in WFConnection (if the peer tore down the connection before the other node had a chance to detect split brain).

At this point, unless you configured DRBD to automatically recover from split brain, you must manually intervene by selecting one node whose modifications will be discarded (this node is referred to as the split brain victim). This intervention is made with the following commands:

# drbdadm secondary resource 
# drbdadm disconnect resource
# drbdadm -- --discard-my-data connect resource

On the other node (the split brain survivor), if its connection state is also StandAlone, you would enter:

# drbdadm connect resource

You may omit this step if the node is already in the WFConnection state; it will then reconnect automatically.

If all else fails and the machines are still in a split-brain condition then on the secondary (backup) machine issue:

drbdadm invalidate resource

I am pleased to finally report that the Centos release of Redhats 5.3 has been built and is available for download from http://www.centos.org/

The highlights of this release can be found at the following URL: http://www.redhat.com

The main areas of interest in my opinion excluding critical secirty fixes are:

• Updated hardwaresupport support for the new Intel Core i7 (Nehalem) chips
• Beefed up virtualiseation support increasing CPU and Ram limits of Virtual machines.
• Inclusion of the fully open sourced OpenJDK. This makes Red Hat Enterprise Linux 5.3 the first enterprise-ready solution with a fully open source Java stack when combined with JBoss Enterprise Application Platform.

For those who already have Centos 5.2 installed you can simply receive the update via Yum.

Before you do the following, check that  you do not have 3rd party repo's and the Centos-testing repo enabled.

You can display the currently enabled repo's using the following command.

$ yum repolist

Then as root at the prompt type:

$ yum update

open database southwind
// open child table
use order_details order orderid in 0
// open parent table
use orders order orderid in 0
set relation to orderid into order_details
do while not eof()
    ? orders.orderid, order_details.productid
    skip
enddo

open database southwind
select orders.orderid, order_details.productid;
from orders left outer join order_details;
on orders.orderid = order_details.orderid

open database southwind
use order_details order orderid in 0
use orders order orderid in 0
set relation to orderid into order_details
do while not eof()
    // Display first or 0 child record
    ? orders.orderid, order_details.productid
    // Display any additional child records
    do while not eof(order_details)
        ? orders.orderid, order_details.productid
        skip in order_details
    enddo
    skip
enddo

open database southwind
use order_details order orderid in 0
use orders order orderid in 0
set relation to orderid into order_details
set skip on
set skip to order_details
list orders.orderid, order_details.productid

Recital is a dynamic programming language with an integrated high performance database particularly well suited for the development and deployment of high transaction throughput applications.  Recital 10 further enhances Recital with extensive features and functionality to facilitate its use in fault tolerant high availability systems. Much of the development of Recital 10 was concentrated on performance optimizations and cluster aware functionality to provide an application platform that can be scaled as needed without any application changes. 

Key features of Recital 10 include:

• Cluster aware database engine that works transparently with drbd, heartbeat, glusterfs and samba
• High degree of fault tolerance with self healing indexes
• Massive performance improvements 
• Extensive internals overall and modernization with superior object-oriented capabilities
• Chronological data versioning with database timelines
• SmartQuery caching
• Database Administration Tools
• Code and Data Profiling
• Better integration with unix/linux command shell
• Incorporates a range of new built-in functions compatible with those in the PHP core libraries
• Built-in support for outputting data in HTML, XML, and JSON format
• Seamless SQL command integration into the Recital scripting language
• Much improved Microsoft FoxPRO language compatibility
• Numerous extensions and improvements (see below for details)
• Very large file support (2^63)