Using ASM,you want to create a disk group that will provide for the greatest amount of redundancy for your ASM data
(you do not have advanced SAN mirroring technology available to you,unfortunately).
Which of the following commands would create a disk group that would offer the maximum in data redundancy?
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A. CREATE DISKGROUP dg_alliance1 NORMAL REDUNDANCY failgroup diskcontrol1 DISK 'c:\oracle\asm_disk\_file_disk3' NAME file_diska1 failgroup diskcontrol2 DISK 'c:\oracle\asm_disk\_file_disk4' NAME file_diskb1; B. CREATE DISKGROUP dg_alliance1 EXTERNAL REDUNDANCY failgroup diskcontrol1 DISK'c:\oracle\asm_disk\_file_disk3'NAME file_diska1; C. CREATE DISKGROUP dg_alliance1 HIGH REDUNDANCY failgroup diskcontrol1 DISK 'c:\oracle\asm_disk\_file_disk1' NAME file_disk1 failgroup diskcontrol2 DISK 'c:\oracle\asm_disk\_file_disk2' NAME file_disk2 failgroup diskcontrol2 DISK 'c:\oracle\asm_disk\_file_disk3' NAME file_disk3; D. CREATE DISKGROUP dg_alliance1 MAXIMUM REDUNDANCY failgroup diskcontrol1 DISK 'c:\oracle\asm_disk\_file_disk1' NAME file_disk1 failgroup diskcontrol2 DISK 'c:\oracle\asm_disk\_file_disk2' NAME file_disk2 failgroup diskcontrol2 DISK 'c:\oracle\asm_disk\_file_disk3' NAME file_disk3 failgroup diskcontrol2 DISK 'c:\oracle\asm_disk\_file_disk4' NAME file_disk4; E.None of the above |
答案：（C）
解析：
题目要求provide for the greatest amount of redundancy for your ASM data，即使用最高级别的冗余来创建磁盘组。
指定冗余度，有三个选择：
1. HIGH(高度冗余>三路)
2. NORMAL(标准冗余--双路)
3. XTERNAL(外部存储冗余)