（537）On the development database rac0,there are six raw devices: /dev/raw/raw1 through/dev/raw/raw6.

/dev/raw/raw1 and/dev/raw/raw2 are 8GB each,and the rest are 6GB each.

An existing disk group +DATA1, of NORMAL REDUNDANCY, uses /dev/raw/raw1 and /dev/raw/raw2.

Which series of the following commands will drop one of the failure groups for +DATA1,

create a new disk group +DATA2 using two of the remaining four raw devices,and then cancel the drop operation from +DATA1?

A.

ALTER DISKGROUP DATA1 DROP DISK DATA1_0001;

CREATE DISKGROUP DATA2 NORMAL REDUNDANCY

FAILGROUP DATA1A DISK '/dev/raw/raw3'

FAILGROUP DATA1B DISK '/dev/raw/raw4';

ALTER DISKGROUP DATA1 UNDROP DISKS;

B.

ALTER DISKGROUP DATA1 DROP DISK DATA1_0001;

CREATE DISKGROUP DATA2 HIGH REDUNDANCY

FAILGROUP DATA1A DISK '/dev/raw/raw3'

FAILGROUP DATA1B DISK '/dev/raw/raw4';

ALTER DISKGROUP DATA1 UNDROP DISKS;

C.

ALTER DISKGROUP DATA1 DROP DISK DATA1_0001;

CREATE DISKGROUP DATA2 NORMAL REDUNDANCY

FAILGROUP DATA1A DISK '/dev/raw/raw3'

FAILGROUP DATA1B DISK '/dev/raw/raw4';

ALTER DISKGROUP DATA1 UNDROP DATA1_0001;

D.

ALTER DISKGROUP DATA1 DROP DISK DATA1_0001

ADD DISK GROUP DATA2 NORMAL REDUNDANCY

FAILGROUP DATA1A DISK '/dev/raw/raw3'

FAILGROUP DATA1B DISK '/dev/raw/raw4';

ALTER DISKGROUP DATA1 UNDROP DISKS;

答案：（A）

解析：

排除法，对答案进行详细比对.

B（X），HIGH REDUNCANCY

C（X），最后一个语句

D（X），应该是CREATE DISKGROUP而不是ADD DISKGROUP