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46Storage Foundation and High Availability Solutions support for Solaris ZonesConcurrent I/O access in non-global zones# zoneadm -z zonename bootConcurrent I/O access in non-global zonesConcurrent I/O allows multiple processes to read from or write to the same filewithout blocking other read(2) or write(2) calls. POSIX semantics requires readand write calls to be serialized on a file with other read and write calls.Concurrent I/O is generally used by applications that require high performancefor accessing data and do not perform overlapping writes to the same file.Veritas Storage Foundation supports concurrent I/O for applications running inthe non-global zones as well. This implies that a process in a non-global zone canaccess the file concurrently with other processes in the global or non-global zone.The application or running threads are responsible for coordinating the writeactivities to the same file when using Concurrent I/O.An application must perform the following activities to enable the concurrent I/Oadvisory on a file:fd=open(filename, oflag)ioctl(fd, VX_SETCACHE, VX_CONCURRENT)write(fd, buff, numofbytes)Veritas extension for Oracle Disk ManagerThe Veritas extension for Oracle Disk Manager (ODM) is specifically designed forOracle9i or later to enhance file management and disk I/O throughput. The featuresof Oracle Disk Manager are best suited for databases that reside in a Veritas FileSystem. Oracle Disk Manager allows Oracle9i or later users to improve databasethroughput for I/O intensive workloads with special I/O optimization.The Veritas extension for Oracle Disk Manager is supported in non-global zones.To run Oracle 10g on a non-global zone and use Oracle Disk Manager, the Oraclesoftware version must be 10.1.0.3 or higher.Care must be taken when installing and removing packages and patches whenworking with the VRTSodm package, for more information refer to the following:■ See “Package and patch installation in non-global zones” on page 52.■ See “Package and patch removal with non-global zone configurations ”on page 52.The following procedure enables Oracle Disk Manager file access from non-globalzones with Veritas File System.
Storage Foundation and High Availability Solutions support for Solaris ZonesExporting VxVM volumes to a non-global zone47To enable Oracle Disk Manager file access from non-global zones with Veritas FileSystem1 Make global zone licenses visible to the non-global zone by exporting the/etc/vx/licenses/lic directory to the non-global zone as a lofs:global# zonecfg -z myzonezonecfg:myzone> add fszonecfg:myzone:fs> set dir=/etc/vx/licenses/liczonecfg:myzone:fs> set special=/etc/vx/licenses/liczonecfg:myzone:fs> set type=lofszonecfg:myzone:fs> endzonecfg:myzone> commit2 Create the /dev/odm directory in the non-global zonepath from the globalzone:global# mkdir -p myzonepath/dev/odm3 Log in to the non-global zone and mount /dev/odm either manually or usethe startup script. Use one of the following:■global# zlogin myzonemyzone# mount -F odm /dev/odm /dev/odmOr:■global# zlogin myzonemyzone# /lib/svc/method/odm startExporting VxVM volumes to a non-global zoneA volume device node can be exported for use in non-global zone using the zonecfgcommand. The following procedure makes a volume vol1 available in thenon-global zone myzone.Caution: Exporting raw volumes to non-global zones has implicit security risks.It is possible for the zone administrator to create malformed file systems thatcould later panic the system when a mount is attempted. Directly writing to rawvolumes, exported to non-global zones, and using utilities such as dd can lead todata corruption in certain scenarios.
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