多选题What are three benefits of using ASM？（）AEase of disk administration and maintenanceBLoad balancing across physical disksCSoftware RAID-1 data redundancy with double or triple mirrorsDAutomatic recovery of failed disks

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多选题

What are three benefits of using ASM？（）

Ease of disk administration and maintenance

Load balancing across physical disks

Software RAID-1 data redundancy with double or triple mirrors

Automatic recovery of failed disks

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相似问题和答案

第1题：

You are the network administrator for Ezonexam. You are installing Windows 2000 Server on a new computer by using the Windows 2000 Server compact disk. The computer has five 18-GB hard disks Dick0, Disk1, Disk2, Disk3, and Disk4. The disks do not have any partitions defined.

You want to use as much space on Disk0 as possible for the partition on which Windows 2000 Server is installed. You want the disk on which you install Windows 2000 Server to be fault tolerant. You also want as much disk space as possible across the other disks to be available for data storage and to be fault tolerant.

What should you do? (Each correct answer presents part of the solution. Choose three)

A. Install Windows 2000 Server on a 4-GB NTFS partition on Disk 0. Configure the five disks as dynamic disks.

B. Install Windows 2000 Server on a 18-GB NTFS partition on Disk 0. Configure the five disks as dynamic disks.

C. Create a RAID-5 volume using Disk2, Disk3, and Disk4.

D. Create a stripped volume using Disk2, Disk3, and Disk4.

E. Create a RAID-5 volume using all disks.

F. Create a stripped volume using all disks.

G. Select the volume on Disk0 and add a mirror using Disk1.

正确答案：BCG
B,C,G 解析：Explanation: RAID-5 volume is where data is written to 3 to 32 physical disks at the same rate, and is interlaced with parity to provide fault tolerance for a single disk failure. Good read performance; good utilization of disk capacity; expensive in terms of processor utilization and write performance as parity must be calculated during write operations.

Only Windows 2000 supports dynamic storage. To support dynamic storage, a single partition is created that includes the entire disk. A disk that you initialize for dynamic storage is a dynamic disk. Dynamic disks are divided into volumes, which can consist of a portion or portions of one or more physical disks. A dynamic disk can contain simple volumes, spanned volumes, striped volumes (RAID-0), mirrored volumes (RAID-1), and striped with parity volumes (RAID-5). You create a dynamic disk by upgrading a basic disk. A Mirrored volume is where two disks contain identical copies of data. The only software RAID supported on the system volume. Good read and write performance; excellent fault tolerance; but costly in terms of disk utilization, because 50 percent of the volume's potential capacity is used for data redundancy.

Incorrect answers:
A: It is not necessary to install Windows 2000 Server on a 4-GB NTFS partition on Disk0. Disk0 consists of 18-GB.

D: Striped volume is where data is written to 2 to 32 physical disks at the same rate. It offers maximum performance and capacity but no fault tolerance.

E: The main disadvantage of a RAID-5 volume is that once a drive fails, system performance suffers until you rebuild the RAID-5 volume. This is because the parity information must be recalculated through memory to reconstruct the missing drive. If more than one drive fails, the RAID-5 volume becomes inaccessible. This does not bode well for fault tolerance as is required in this question.

F: Striped volumes do not provide fault tolerance.

第2题：

Which two are the uses of the ASM metadata backup and restore （AMBR） feature？（）

A、 It can be used to back up all data on ASM disks.
B、 It can be used to recover the damaged ASM disk group along with the data.
C、 It can be used to gather information about a preexisting ASM disk group with disk paths，disk name，failure groups，attributes templates，and alias directory structure.
D、 It can be used to re-create the ASM disk group with its attributes.

正确答案:C,D

第3题：

Examine the following command:ALTER DISKGROUP data MOUNT FORCE;In which scenario can you use the above command to mount the disk group? ()

A. when ASM disk goes offline

B. when one or more ASM files are dropped

C. when some disks in a disk group are offline

D. when some disks in a failure group for a disk group are rebalancing

参考答案：C

第4题：

You plan to use the In Database Archiving feature of Oracle Database 12c, and store rows that are inactive for over three months, in Hybrid Columnar Compressed (HCC) format. Which three storage options support the use of HCC?（）

A、ASM disk groups with ASM disks consisting of Exadata Grid Disks.
B、ASM disk groups with ASM disks consisting of LUNS on any Storage Area Network array
C、ASM disk groups with ASM disks consisting of any zero padded NFS-mounted files
D、Database files stored in ZFS and accessed using conventional NFS mounts.
E、Database files stored in ZFS and accessed using the Oracle Direct NFS feature
F、Database files stored in any file system and accessed using the Oracle Direct NFS feature
G、ASM disk groups with ASM disks consisting of LUNs on Pillar Axiom Storage arrays

正确答案:A,E,G

第5题：

Examine the following command： ALTER DISKGROUP data MOUNT FORCE； In which scenario can you use the above command to mount the disk group？（）

A、 when ASM disk goes offline
B、 when one or more ASM files are dropped
C、 when some disks in a disk group are offline
D、 when some disks in a failure group for a disk group are rebalancing

正确答案:C

第6题：

What are three benefits of using chassis clustering？（）

A、Provides stateful session failover for sessions.
B、Increases security capabilities for IPsec sessions.
C、Provides active-passive control and data plane redundancy.
D、Enables automated fast-reroute capabilities.
E、Synchronizes configuration files and session state

正确答案:A,C,E

第7题：

Which of the following is a benefit of ASM fast disk resync?（）

A、Failed disks are taken offline immediately but are not dropped.
B、Disk data is never lost.
C、By default, the failed disk is not dropped from the disk group ever, protecting you from loss of that disk.
D、The failed disk is automatically reformatted and then resynchronized to speed up the recovery process.
E、Hot spare disks are automatically configured and added to the disk group.

正确答案:A

第8题：

You plan to use the In Database Archiving feature of Oracle Database 12c, and store rows that are inactive for over three months, in Hybrid Columnar Compressed (HCC) format.Which three storage options support the use of HCC?（）

A. ASM disk groups with ASM disks consisting of Exadata Grid Disks.

B. ASM disk groups with ASM disks consisting of LUNS on any Storage Area Network array

C. ASM disk groups with ASM disks consisting of any zero padded NFS-mounted files

D. Database files stored in ZFS and accessed using conventional NFS mounts.

E. Database files stored in ZFS and accessed using the Oracle Direct NFS feature

F. Database files stored in any file system and accessed using the Oracle Direct NFS feature

G. ASM disk groups with ASM disks consisting of LUNs on Pillar Axiom Storage arrays

参考答案：A, E, G

第9题：

You are an Oracle DBA responsible for an ASM instance. The disk controller on your system fails. You suspect that the disk itself is okay. You know it will take 24 hours to replace the controller and you don’t want to have to rebuild the disks from scratch. What do you do？（）

A、 Take the whole disk group offline and wait for the controller card to be installed. Once it’s installed，bring the disk group online again.
B、 Change the ASM parameter ASM_PREFERRED_READ_FAILURE_GROUPS to indicate that you want to read from the non-failed disk. Once the disk controller is replaced，reset the parameter to its original value.
C、 You have no choice but to rebuild the disk. Drop the disk from the disk group and wait for the controller to be replaced. Once the controller is replaced， add the disk back into the disk group and allow ASM to rebuild it.
D、 If you are using any setting other than REDUNDANCY EXTERNAL for your disk group，you will have to recover any data on that disk from a backup. The database will be unavailable until you can correct the problem and perform recovery.
E、 Change the attribute DISK_REPAIR_TIME on the disk group to a time greater than 24 hours.

正确答案:E

第10题：

You are administering a database stored in Automatic Storage Management (ASM). You use RMAN to back up the database and the MD_BACKUP command to back up the ASM metadata regularly. You lost an ASM disk group DG1 due to hardware failure. In which three ways can you re-create the lost disk group and restore the data?（）

A、Use the MD_RESTORE command to restore metadata for an existing disk group by passing the existing disk group name as an input parameter and use RMAN to restore the data.
B、Use the MKDG command to restore the disk group with the same configuration as the backed-up disk group and data on the disk group.
C、Use the MD_RESTORE command to restore the disk group with the changed disk group specification, failure group specification, name, and other attributes and use RMAN to restore the data.
D、Use the MKDG command to restore the disk group with the same configuration as the backed-up disk group name and same set of disks and failure group configuration, and use RMAN to restore the data.
E、Use the MD_RESTORE command to restore both the metadata and data for the failed disk group.
F、Use the MKDG command to add a new disk group DG1 with the same or different specifications for failure group and other attributes and use RMAN to restore the data.

正确答案:C,E,F

多选题What are three benefits of using ASM？（）AEase of disk administration and maintenanceBLoad balancing across physical disksCSoftware RAID-1 data redundancy with double or triple mirrorsDAutomatic recovery of failed disks

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