.. drop disk Removes a disk from a failure group within a disk group
and performs an automatic rebalance
alter diskgroup ... drop ... add Drops a disk from a failure group and adds another disk,
all in the same command
alter diskgroup ... mount Makes a disk group available to all instances
alter diskgroup ... dismount Makes a disk group unavailable to all instances
alter diskgroup ... check all Verifies the internal consistency of the disk group
TABLE 4-6 Disk Group ALTER Commands
FIGURE 4-20 EM Database Control ASM instance login page
Chapter 4: Physical Database Layouts and Storage Management 115
FIGURE 4-21 EM Database Control ASM instance home page
FIGURE 4-22 EM Database Control ASM disk group administration page
116 Oracle Database 11g DBA Handbook
On the page in Figure 4-23 you can see that the new disk in the disk group is significantly
smaller than the other disks in the group; this may affect the performance and waste disk space
within the disk group. To remove a failure group using EM Database Control, select the member
disk??™s check box and click the Remove button.
Other EM Database Control ASM??“related pages show I/O response time for the disk group,
the templates defined for the disk group, the initialization parameters in effect for this ASM
instance, and more.
Using the asmcmd Command
The asmcmd utility, new to Oracle 10g Release 2, is a command-line utility that provides you an
easy way to browse and maintain objects within ASM disk groups by using a command set similar
to Linux shell commands such as ls and mkdir.
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