Abstract: . . .  hard,intr,sync,bg 0 0 Page 6 ENTERPRISE RESOURCE PLANNING: SAP DELL POWER SOLUTIONS Reprinted from Dell Power Solutions, February 2006. Copyright © 2006 Dell Inc. All rights reserved . February 2006 84 Configuring SAP central instance services for the cluster Access to data in the underlying database of an SAP system is synchronized with a special lock system called the SAP enqueue mechanism. This mechanism serializes access and prevents access from being changed for more than . . .
. . .  network-scripts/ifcfg-eth0 DEVICE=eth0 BOOTPROTO=static IPADDR=10.17.64.25 NETMASK=255.255.252.0 ONBOOT=yes TYPE=Ethernet GATEWAY=10.17.64.1 1 For more information, refer to the “Checking the network connections” section in “Creating Flexible, Highly Available SAP Solutions Leveraging Oracle9 i and Linux on Dell Servers and Dell/EMC Storage” by David Detweiler, Achim Lernhard, Florenz Kley, Thorsten Staerk, and Wolfgang Trenkle in Dell Power Solutions,s November 2005; www.dell.com/downloads/global/power/ps4q05-20050174-SAP.pdf. . . .
. . .  recognizes that the enqueue server has started up, it will transfer its current lock table before exiting. The newly started enqueue server can now continue without losing valuable enqueue state information. Additionally, OS-level high-availability software makes the enqueue server available via a virtual, clustered IP address, masking the restart from the clients so that they always connect to the same IP address. Splitting the central instance To secure the SAP system’s services in a high-availability cluster, administrators must split the traditional . . .
. . .  Staerk is a consultant at the Dell SAP Competence Center in Walldorf, Germany, as part of the SAP LinuxLab. He works extensively on Oracle9 i RAC technologies for SAP, researches new SAP technologies and functionality, and certifies Dell platforms for SAP on Linux . Wolfgang Trenkle is a senior consultant at the Dell SAP Competence Center in Walldorf, Germany, and is also a member of the Dell EMEA Enter- prise Solutions Center team in Limerick, Ireland. In addition to serving as a consultant and supporting proof of concepts, Wolfgang . . .
. . .  global SAP community. RAC_app_server DVBGS00 ls3216 10.17.64.22 RAC_message_server DM01 ls3221 10.17.64.27 RAC_enqueue_server E02 ls3222 10.17.64.28 R02 no address. Bound to the public IP address of the owning member. Figure 15. Corresponding init scripts for cluster services RAC_app_server /etc/init.d/sapappserver-RAC RAC_message_server /etc/init.d/sapmsgsrv-RAC RAC_enqueue_server /etc/init.d/sapenserver-RAC  . . .
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