Oracle OCP 1Z0 053 Q124(DISK_REPAIR_TIME)

124.You are managing Oracle Database 11g with an ASM storage with high redundancy. The following
command was issued to drop the disks from the dga disk group after five hours:
ALTER DISKGROUP dga OFFLINE DISKS IN FAILGROUP f2 DROP AFTER 5H;
Which statement is true in this scenario?
A. It starts the ASM fast mirror resync.
B. All the disks in the dga disk group would be OFFLINE and the DISK_REPAIR_TIME disk attribute
would be set to 5 hours.
C. It drops all disk paths from the dga disk group.
D. All the disks in the dga disk group in failure group f2 would be OFFLINE and the DISK_REPAIR_TIME
disk attribute would be set to 5 hours.
Answer: D

參考：http://blog.csdn.net/jgmydsai/article/details/37650647
        http://docs.oracle.com/cd/E11882_01/server.112/e18951/asmdiskgrps.htm#OSTMG10044
預設情況下，當一個磁碟離線3.6小時之後，會被ASM移除（drop）。通過將DISK_REPAIR_TIME 引數設定為一個更長的時間，可以推遲磁碟的移除。

原文：
By default, Oracle ASM drops a disk in 3.6 hours after it is taken offline. You can set the DISK_REPAIR_TIME disk group attribute to delay the drop operation by specifying a time interval to repair the disk and bring it back online. The time can be specified in units of minutes (m or M) or hours (h or H). If you omit the unit, then the default unit is hours. TheDISK_REPAIR_TIME disk group attribute can only be set with the ALTER DISKGROUP SQL statement.

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