Mark Wagner's Oracle on Linux Site » ASM

ASMCMD-08103: failed to connect to ASM; ASMCMD running in non-connected mode

Mark Wagner — Sat, 15 Aug 2009 20:05:15 +0000

The warning is provided in 2 cases. If the ORACLE_SID is not set properly or when the ASM instance is not running.

Before Oracle 11g the user received an error which was indicated that the environment was wrong. In Oracle 11g a must beter message is provide, and there are situations where you can use ASMCMD even when the ASM instance is not started or the ORACLE_SID is not set properly.

So depending on the situation the message can be correct. If this is not wanted, validate if the ASM instance is running and/or ORACLE_SID is set correctly.

When using ASMCMD, if ASM instance is running, v$ views are used to retrieve the information requested. If the ASM instance is down, the diskheader is read to provide the requested information when using ASMCMD.

Oracle ASM Errors

Mark Wagner — Thu, 13 Aug 2009 17:02:08 +0000

# /etc/init.d/oracleasm createdisk VOL1 /dev/xvdb1
Marking disk "/dev/xvdb1" as an ASM disk: asmtool: Device "/dev/xvdb1" is not
a partition
                                                           [FAILED]

Workaround: Run the asmtool command with the -a force=yes parameter to ignore the partition check, for example

# asmtool -C -l /dev/oracleasm -n VOL1 -s /dev/xvdb1 -a force=yes
/etc/init.d/oracleasm scandisks

The oracleasm scandisks command fixes permissions once the disk is created.

How to see the files stored in ASM – Oracle Automatic Storage Management

Mark Wagner — Tue, 07 Jul 2009 15:39:19 +0000

#asmcmd -p

Asmcmd lets you view directory structuture and files stored inside Oracle ASM usitlizing a CLI and unix like commands.

Command	Description
cd	Changes the current directory to the specified directory.
du	Displays the total disk space occupied by ASM files in the specified ASM directory and all its subdirectories, recursively.
exit	Exits ASMCMD.
find	Lists the paths of all occurrences of the specified name (with wildcards) under the specified directory.
help	Displays the syntax and description of ASMCMD commands.
ls	Lists the contents of an ASM directory, the attributes of the specified file, or the names and attributes of all disk groups.
lsct	Lists information about current ASM clients.
lsdg	Lists all disk groups and their attributes.
mkalias	Creates an alias for a system-generated filename.
mkdir	Creates ASM directories.
pwd	Displays the path of the current ASM directory.
rm	Deletes the specified ASM files or directories.
rmalias	Deletes the specified alias, retaining the file that the alias points to.

Wildcard

The wildcard characters “*” and “%” match zero or more characters anywhere within an absolute or relative path. The two characters behave identically. The ASMCMD commands that accept wildcards are ls, du, rm, and find. The following examples illustrate the use of wildcards.