2018-02-20

Configuring Disk Devices Manually for Oracle ASM (without ASMLib)

Environment: Oracle Linux Server release 7.3 on Oracle VM 3.4.3

In Oracle VM Manager, edit VM and add a new Virtual Disk, e.g.

 

In the VM as root, see the new disk:

 

lsblk

NAME    MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT

xvda    202:0    0   30G  0 disk

├─xvda1 202:1    0  512M  0 part /boot

├─xvda2 202:2    0    8G  0 part /

├─xvda3 202:3    0    4G  0 part /tmp

├─xvda4 202:4    0    1K  0 part

├─xvda5 202:5    0  1.5G  0 part /home

└─xvda6 202:6    0   16G  0 part [SWAP]

xvdb    202:16   0   50G  0 disk

└─xvdb1 202:17   0   50G  0 part /opt/oracle

xvdc    202:32   0   10G  0 disk

└─xvdc1 202:33   0   10G  0 part /opt/netbackup

xvdd    202:48   0  800G  0 disk

└─xvdd1 202:49   0  800G  0 part /data001/oradata/CDRDEV

xvde    202:64   0  200G  0 disk

└─xvde1 202:65   0  200G  0 part /data001/fast_recovery_area

xvdf    202:80   0  800G  0 disk

└─xvdf1 202:81   0  800G  0 part /data001/oradata/CDRSIT

xvdg    202:96   0  100G  0 disk

└─xvdg1 202:97   0  100G  0 part /data001/archivelogs

xvdh    202:112  0  800G  0 disk

└─xvdh1 202:113  0  800G  0 part /data001/oradata/CDRDEV1

xvdi    202:128  0  800G  0 disk

└─xvdi1 202:129  0  800G  0 part /data001/oradata/CDRSIT1

xvdj    202:144  0  800G  0 disk

└─xvdj1 202:145  0  800G  0 part

 

For persistent device naming, we can configure ASMLIB or set udev rules. We need to use a partition UUID (not a filesystem UUID) in udev rules. For this, use parted to create a GPT partition.

parted /dev/xvdj

mktable gpt

 

to create a GPT partition:

mkpart PART-LABEL START END

e.g.

mkpart asmpart1 0% 100%

(parted) print

Model: Xen Virtual Block Device (xvd)

Disk /dev/xvdj: 859GB

Sector size (logical/physical): 512B/512B

Partition Table: gpt

Disk Flags:

 

Number  Start   End    Size   File system  Name      Flags

 1      1049kB  859GB  859GB               asmpart1

 

udevadm info --query=property /dev/xvdj1

DEVLINKS=/dev/disk/by-partlabel/asmpart1 /dev/disk/by-partuuid/48940eb5-f6fa-4558-aeba-b12b81199e27 /dev/oracleasm/disk1

DEVNAME=/dev/xvdj1

DEVPATH=/devices/vbd-51856/block/xvdj/xvdj1

DEVTYPE=partition

ID_FS_TYPE=oracleasm

ID_FS_USAGE=filesystem

ID_PART_ENTRY_DISK=202:144

ID_PART_ENTRY_NAME=asmpart1

ID_PART_ENTRY_NUMBER=1

ID_PART_ENTRY_OFFSET=2048

ID_PART_ENTRY_SCHEME=gpt

ID_PART_ENTRY_SIZE=1677717504

ID_PART_ENTRY_TYPE=ebd0a0a2-b9e5-4433-87c0-68b6b72699c7

ID_PART_ENTRY_UUID=48940eb5-f6fa-4558-aeba-b12b81199e27

ID_PART_TABLE_TYPE=gpt

MAJOR=202

MINOR=145

SUBSYSTEM=block

TAGS=:systemd:

USEC_INITIALIZED=800372237892

 

 

vi /etc/udev/rules.d/99-oracle-asmdevices.rules

KERNEL=="xvd??", ENV{ID_PART_ENTRY_UUID}=="48940eb5-f6fa-4558-aeba-b12b81199e27", SYMLINK+="oracleasm/disk1", OWNER="oracle", GROUP="dba", MODE="0660"

 

To implement the new rules:

udevadm trigger

 

ls -la /dev/oracleasm/disk1

lrwxrwxrwx. 1 root root 8 Feb 15 12:32 /dev/oracleasm/disk1 -> ../xvdj1

 

ls -la /dev/xvd*

brw-rw----. 1 root   disk 202,   0 Feb 15 12:32 /dev/xvda

brw-rw----. 1 root   disk 202,   1 Feb 15 12:32 /dev/xvda1

brw-rw----. 1 root   disk 202,   2 Feb 15 12:32 /dev/xvda2

brw-rw----. 1 root   disk 202,   3 Feb 15 12:32 /dev/xvda3

brw-rw----. 1 root   disk 202,   4 Feb 15 12:32 /dev/xvda4

brw-rw----. 1 root   disk 202,   5 Feb 15 12:32 /dev/xvda5

brw-rw----. 1 root   disk 202,   6 Feb 15 12:32 /dev/xvda6

brw-rw----. 1 root   disk 202,  16 Feb 15 12:32 /dev/xvdb

brw-rw----. 1 root   disk 202,  17 Feb 15 12:32 /dev/xvdb1

brw-rw----. 1 root   disk 202,  32 Feb 15 12:32 /dev/xvdc

brw-rw----. 1 root   disk 202,  33 Feb 15 12:32 /dev/xvdc1

brw-rw----. 1 root   disk 202,  48 Feb 15 12:32 /dev/xvdd

brw-rw----. 1 root   disk 202,  49 Feb 15 12:32 /dev/xvdd1

brw-rw----. 1 root   disk 202,  64 Feb 15 12:32 /dev/xvde

brw-rw----. 1 root   disk 202,  65 Feb 15 12:32 /dev/xvde1

brw-rw----. 1 root   disk 202,  80 Feb 15 12:32 /dev/xvdf

brw-rw----. 1 root   disk 202,  81 Feb 15 12:32 /dev/xvdf1

brw-rw----. 1 root   disk 202,  96 Feb 15 12:32 /dev/xvdg

brw-rw----. 1 root   disk 202,  97 Feb 15 12:32 /dev/xvdg1

brw-rw----. 1 root   disk 202, 112 Feb 15 12:32 /dev/xvdh

brw-rw----. 1 root   disk 202, 113 Feb 15 12:32 /dev/xvdh1

brw-rw----. 1 root   disk 202, 128 Feb 15 12:32 /dev/xvdi

brw-rw----. 1 root   disk 202, 129 Feb 15 12:32 /dev/xvdi1

brw-rw----. 1 root   disk 202, 144 Feb 15 12:32 /dev/xvdj

brw-rw----. 1 oracle dba  202, 145 Feb 15 12:32 /dev/xvdj1

 

to see all disks and partitions:

lsblk -o name,mountpoint,label,size,uuid,partlabel,partuuid,serial,wwn,fstype

 

Alternatively, you can use a partition label name ID_PART_ENTRY_NAME:

cat /etc/udev/rules.d/99-oracle-asmdevices.rules

KERNEL=="xvd??", ENV{ID_PART_ENTRY_UUID}=="48940eb5-f6fa-4558-aeba-b12b81199e27", SYMLINK+="oracleasm/disk1", OWNER="oracle", GROUP="dba", MODE="0660"

KERNEL=="xvd??", ENV{ID_PART_ENTRY_NAME}=="asmpart2", SYMLINK+="oracleasm/disk2", OWNER="oracle", GROUP="dba", MODE="0660"

 

lsblk -o name,partlabel,partuuid

NAME    PARTLABEL PARTUUID

xvda

├─xvda1

├─xvda2

├─xvda3

├─xvda4

├─xvda5

└─xvda6

xvdb

└─xvdb1

xvdc

└─xvdc1

xvdd

└─xvdd1

xvde

└─xvde1

xvdf

└─xvdf1

xvdg

└─xvdg1

xvdh

└─xvdh1

xvdi

└─xvdi1

xvdj

└─xvdj1 asmpart1  48940eb5-f6fa-4558-aeba-b12b81199e27

xvdk

└─xvdk1 asmpart2  0b8ba20c-a10d-4564-b582-0692fd9657e8

 

 

 

 

 

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