Oracle RAC - ASMCA answers (disk groups DATA, FRA, ONTRLG)

category: solutionz · date: 2016-12-31 · updated: 2026-10-02 · author: LALA

Oracle RAC Solution · Config document · referenced from Database software, listener and disk groups

The answers given to the Oracle ASM Configuration Assistant (asmca) to create the three disk groups of the database. The fourth disk group of the cluster, OCR on ASMDISK1, was created by the Grid Infrastructure installer and is not part of this document.

Item	Value
Tool	`asmca`
Started on	`oradb01`, as `grid`, with an X server running on the workstation
Disk groups created	`DATA`, `FRA`, `ONTRLG`
Redundancy	External (None) for all three
Disks	ASMLib disks `ORCL:ASMDISK2` to `ORCL:ASMDISK5`
Software version at the time	Grid Infrastructure 11.2.0.4

The answers

ini

# Tab "Disk Groups": click Create, once for each disk group.
# The member disk lines carry the columns of the "Select Member Disks" table:
# Disk Path, Header Status, Disk Name (empty for all disks), Size (MB), Quorum.

Create Disk Group / Disk Group Name = DATA
Create Disk Group / Redundancy = External (None)
Create Disk Group / Member disk = ORCL:ASMDISK2, PROVISIONED, 102399 MB, quorum not checked
Create Disk Group / Member disk = ORCL:ASMDISK3, PROVISIONED, 102399 MB, quorum not checked

Create Disk Group / Disk Group Name = FRA
Create Disk Group / Redundancy = External (None)
Create Disk Group / Member disk = ORCL:ASMDISK4, PROVISIONED, 204799 MB, quorum not checked

Create Disk Group / Disk Group Name = ONTRLG
Create Disk Group / Redundancy = External (None)
Create Disk Group / Member disk = ORCL:ASMDISK5, PROVISIONED, 20479 MB, quorum not checked

Disk group	Disks	LUNs behind them	Size as ASMCA showed it
`DATA`	`ASMDISK2`, `ASMDISK3`	`ORADB-DATA01`, `ORADB-DATA02`	2 x 102399 MB
`FRA`	`ASMDISK4`	`ORADB-FRA`	204799 MB
`ONTRLG`	`ASMDISK5`	`ORADB-ONTRLG`	20479 MB

PROVISIONED is the header status of a disk that ASMLib has labelled and that belongs to no disk group yet. External redundancy means ASM keeps one copy of every extent and leaves protection to the storage behind the LUNs; what that storage does is not in the notes.

The sizes here agree with the disk table of the preparation notes (two data disks of 107.4 GB, one recovery disk of 214.7 GB). The oracleasm-discover output in the same notes does not: it lists ASMDISK2 as the large disk and ASMDISK3 and ASMDISK4 as the two smaller ones. See Storage and ASM disks.

The notes stop at the last Create Disk Group dialogue: no allocation unit size, no compatibility attributes and no listing of the mounted groups (asmcmd lsdg or similar) were recorded.

Checked against Oracle AI Database 26ai

As built	Today
`asmca` in graphical mode, run as `grid`	ASMCA still exists and is the documented tool for creating disk groups
External redundancy on all disk groups	Still what Oracle recommends for storage that protects the data itself: "use external redundancy with storage devices such as RAID, or other similar devices that provide their own data protection mechanisms". The protection then rests entirely on the storage system behind the LUNs
ASMLib disks, discovered as `ORCL:ASMDISKn`	ASMLib is still supported and the discovery string `ORCL:*` is unchanged; version 3 works through io_uring without a kernel driver

The disk groups could be created the same way today.