Which three statements are true about ASM dynamic volume manager (ADVM)?
A. ADVM provides volume management services and a standard disk device driver interface to file system drivers.
B. The administrator can use ADVM to create volumes that contain bootable vendor operating systems.
C. File systems and other disk-based applications issue I/O requests to ADVM volume devices as they would to other storage devices on a vendor operating system.
D. ADVM extends ASM by providing a disk driver interface to storage backed by an ASM volume.
E. To use the ADVM driver, the oraclesacfs, oradeoks, and oracleadvm drivers must be loaded, but an ASM instance is not required.
Correct Answer: ACD
Explanation/Reference:
At the operating system (OS) level, the ASM instance provides the disk group, which is a logical container for physical disk space. The disk group can hold ASM database files and ASM dynamic volume files. The ASM Dynamic Volume Manager (ADVM) presents the volume device file to the operating system as a block device. The mkfs utility can be used to create an ASM file system in the volume device file.
Four OS kernel modules loaded in the OS provide the data service. On Linux, they are:
oracleasm, the ASM module;
oracleadvm, the ASM dynamic volume manager module;
oracleoks, the kernel services module;
and oracleacfs, the ASM file system module.
and oracleacfs, the ASM file system module.
These modules provide the ASM Cluster File System, ACFS snapshots, the ADVM, and cluster services. The ASM volumes are presented to the OS as a device file at /dev/asm/<volume name>-<number>.
ADVM provides volume management services and a standard disk device driver interface to clients. Clients, such as file systems and other disk-based applications, issue I/O requests to ADVM volume devices as they would to other storage devices on a vendor operating system.
ADVM extends ASM by providing a disk driver interface to storage backed by an ASM file. The administrator can use the ADVM to create volumes that contain file systems. These file systems can be used to support files beyond Oracle database files such as executables, report files, trace files, alert logs, and other application data files. With the addition of ADVM and ACFS, ASM becomes a complete storage solution of user data for both database and non-database file needs. ACFS is intended as a general file system accessible by the standard OS utilities. ACFS can be used in either a single server or a cluster environment.
Note: Oracle ACFS file systems cannot be used for an Oracle base directory or an Oracle grid infrastructure home that contains the software for Oracle Clusterware, ASM, Oracle ACFS, and Oracle ADVM components. Oracle ACFS file systems cannot be used for an OS root directory or boot directory.
ASM volumes serve as containers for storage presented as a block device accessed through ADVM. File systems or user processes can do I/O on this “ASM volume device” just as they would on any other device. To accomplish this, ADVM is configured into the operating system. A volume device is constructed from an ASM file.
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