What is ASMVOL? (Doc ID 1447518.1)

Last updated on JUNE 28, 2017

Applies to:

Oracle Server - Enterprise Edition - Version 11.2.0.2 and later
Information in this document applies to any platform.

Symptoms

You can see that asmvol is part of diskgroup +DATA so you have the following questions:

What is ASMVOL? What is this space used for? Can I downsize it?


Changes

You have allocated a very big disk for disk group +DATA. ASMCMD du command shows that only small portion is used but application users complain of low available space.
The following example displays information about the clients that are accessing the data disk group.
ASMCMD [+] > lsct data
DB_Name Status Software_Version Compatible_version Instance_Name Disk_Group
+ASM CONNECTED 11.2.0.1.0 11.2.0.0.0 +ASM DATA
asmvol CONNECTED 11.2.0.1.0 11.2.0.0.0 +ASM DATA
orcl CONNECTED 11.2.0.1.0 11.2.0.0.0 orcl DATA
The following are examples of the lsof command. The first example lists the open files for the data disk group. The second example lists the open files for the Oracle ASM instance.
ASMCMD [+] > lsof -G data
DB_Name Instance_Name Path
orcl orcl +data/orcl/controlfile/current.260.691577263
orcl orcl +data/orcl/datafile/example.265.691577295
orcl orcl +data/orcl/datafile/sysaux.257.691577149
orcl orcl +data/orcl/datafile/system.256.691577149
orcl orcl +data/orcl/datafile/undotbs1.258.691577151
orcl orcl +data/orcl/datafile/users.259.691577151
orcl orcl +data/orcl/onlinelog/group_1.261.691577267
orcl orcl +data/orcl/onlinelog/group_2.262.691577271
orcl orcl +data/orcl/onlinelog/group_3.263.691577275
orcl orcl +data/orcl/tempfile/temp.264.691577287
ASMCMD [+] > lsof -C +ASM
DB_Name Instance_Name Path
asmvol +ASM +data/VOLUME1.271.679226013
asmvol +ASM +data/VOLUME2.272.679227351

ASMVOL is listed everywhere but you do not know what this space is used for.

Cause

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