Adaptec 1130U2 - Storage Controller RAID)- U2W SCSI 80 MBps Specifications download pdf (Page 56)

This format requires host name and address, port (default 1521) and SID (for example, "ORCL"):

jdbc:oracle:thin:@host:port:SID

This format is for a fully configured Oracle client with Oracle Net, which is useful for non-TCP

configuration or Oracle RAC (real application clusters):

jdbc:oracle:thin:@tnsname

The following example is for an Oracle RAC with a thin driver, without the full Oracle client installed:

jdbc:oracle:thin:@(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=rac1-vip)(PORT=1521))

(ADDRESS=(PROTOCOL=TCP)(HOST=rac2-vip)(PORT=1521))(LOAD_BALANCE=yes)(FAILOVER=ON)

(CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME=RAC.DBTEAM)(FAILOVER_MODE=(BACKUP=rac1)

(TYPE=SELECT)(METHOD=BASIC)))))

In this example, rac1-vip is first node virtual IP, rac2-vip is second node virtual IP, RAC.DBTEAM is RAC

DB service name, and rac1 is name of failover node.

For more information about JDBC URL formatting for Oracle databases, see the oracle.com Web site.

DNS Load Balancing Solutions and vCenter Server Datastore Naming

vCenter Server 5.x uses different internal identifiers for datastores than earlier versions of vCenter Server.

This change affects the way that you add shared NFS datastores to hosts and can affect upgrades to vCenter

Server 5.x.

vCenter Server versions before version 5.0 convert datastore host names to IP addresses. For example, if you

mount an NFS datastore by the name \\nfs-datastore\folder, pre-5.0 vCenter Server versions convert the

name nfs-datastore to an IP address like 10.23.121.25 before storing it. The original nfs-datastore name is

lost.

This conversion of host names to IP addresses causes a problem when DNS load balancing solutions are

used with vCenter Server. DNS load balancing solutions themselves replicate data and appear as a single

logical datastore. The load balancing happens during the datastore host name-to-IP conversion by resolving

the datastore host name to different IP addresses, depending on the load. This load balancing happens

outside vCenter Server and is implemented by the DNS server. In vCenter Server versions before version

5.0, features like vMotion do not work with such DNS load balancing solutions because the load balancing

causes one logical datastore to appear as several datastores. vCenter Server fails to perform vMotion

because it cannot recognize that what it sees as multiple datastores are actually a single logical datastore that

is shared between two hosts.

To solve this problem, vCenter Server versions 5.0 and later do not convert datastore names to IP addresses

when you add datastores. This enables vCenter Server to recognize a shared datastore, but only if you add

the datastore to each host by the same datastore name. For example, vCenter Server does not recognize a

datastore as shared between hosts in the following cases.

The datastore is added by IP address to host1 and by hostname to host2.

The datastore is added by hostname to host1, and by hostname.vmware.com to host2.

For vCenter Server to recognize a datastore as shared, you must add the datastore by the same name to

every host.

Datastore Names and Upgrades to vCenter Server 5.x

In vCenter Server versions before version 5.0, vCenter Server database stores datastore paths in the old

format, as IP addresses. The upgrade to vCenter Server 5.x converts these paths to the new format. If you

use a DNS load balancing solution with shared datastores, before you upgrade to vCenter Server 5.x, make

sure that every shared datastore is mounted on each of its hosts with the same name.

vSphere Upgrade

56 VMware, Inc.

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