Performing Oracle Advanced Recovery - OCP: Oracle Database 12c Administrator Certified Professional - page 322

(which should be using a GRID_HOME location that is separate from your ORACLE_HOME loca-
tion. So, starting asmcmd might look like this:

/opt/oracle>export ORACLE_SID=+ASM1
/opt/oracle>asmcmd

The asmcmd tool provides a great deal of functionality, as seen in Table 7.5 below:

TABle 7.5 ASMCMD commands

Command Purpose Example

Cd Changes ASM directory. cd +group1

du Gets disk use. du

find Finds directory or file. find + rob11g

help Displays the help screen. help

ls Lists files in directory. ls -l

lsct Lists all clients using the

ASM instance.

lsct

lsdg Lists information on disk

groups in the ASM instance.

lsdg

lsdsk Lists ASM visible disks.

Supported only in Unix.

lsdsk -k -d DATA *

mkalias Creates an ASM alias for a

given ASM filename.

mkalias +cooked_dgroup1/11gDB/
controlfile/Current.258.613087119
+cooked_dgroup1/control01.ctl

Mkdir Creates an ASM directory. mkdir old

md_backup Backs up ASM metadata. md_backup -b /tmp/dgbackup070222 -g

dgroup1 -g dgroup2

md_restore Restores ASM metadata. md_restore -t full -g dgroup1 -i /

tmp/dgbackup070222

pwd Locates where you are on

the ASM directory tree.

pwd

remap Remaps a range of physical

blocks on disk.

remap data data_0003 6000-8000