Application Notes Device Mapper Multipath with Oracle ASM on Linux Part number: 5697-7806 First edition: October 2008
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Document overview This document focuses on the best practices to leverage the features provided by Device Mapper Multipath while deploying Oracle Automatic Storage Management (ASM) on Linux. This document is not designed to replace the documentation supplied with individual solution components. It is intended to provide customers an additional resource for configuring Oracle ASM with Device Mapper multipath on Linux.
On Linux, every path to the storage disk on SAN is represented by a device file /dev/sd*. DM multipath driver creates a pseudo device /dev/mapper/* which can be used by the application for I/O. DM multipath driver manages the I/Os sent to the disk and monitors the disk paths to balance the load across all the available paths or to take corrective action in case of path failures.
Fix permissions of Oracle ASM disks on boot (y/n) [y]:y Writing Oracle ASM library driver configuration:[ OK ] Scanning system for ASM disks:[ OK ] ASMLib on startup scans the devices available on the system and discovers ASMLib labeled disks.
2. Click Next. The following screen displays: 3. Select Configure Automatic Storage Management and click Next. 4. Select the disk groups used by the database instance required to be mounted and click Mount.
5. Click Finish and login to the Oracle Enterprise Manager (as shown in the following figure) as sys, click Startup, and complete the startup procedure by providing the required access credentials.
References • Installation and Reference Guide Device Mapper Multipath Enablement Kit for HP StorageWorks Disk Arrays http://www.hp.com/go/devicemapper • For a more detailed overview of ASM http://www.oracle.
