How to Delete ASM Disk on Multipath Device (文档 ID 1949791.1).docx

jenk

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2021-02-22

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APPLIES TO:

Linux OS - Version Oracle Linux 5.0 to Oracle Linux 6.5 [Release

OL5 to Ol6U5]

Linux x86

Linux x86-64

GOAL

Remove ASM disk on multipath device (Labeled as ASMDISK01 in

this sample) from Oracle Linux server.

SOLUTION

1. First make sure that ASM disk is no longer used by any disk

group, otherwise you might risk data integrity.

2. Find out ASM disk mapping:

# oracleasm listdisks

ASMDISK01

(abbreviated output)

# oracleasm querydisk -p ASMDISK01

Disk "ASMDISK01" is a valid ASM disk

/dev/sdf: LABEL="ASMDISK01" TYPE="oracleasm"

(abbreviated output)

# /etc/init.d/oracleasm querydisk -d ASMDISK01

Disk "ASMDISK01" is a valid ASM disk on device [8, 16]

(abbreviated output)

3. Identify multipath device used for ASMDISK01:

# multipath -ll

mpath1 dm-4 IBM DS

size=10G features='0' hwhandler='0' wp=rw

`-+- policy='round-robin 0' prio=1 status=active

`- 5:0:0:1 sdf 8:16 active ready running <-

`- 5:0:0:1 sdg 8:17 active ready running

(abbreviated output)

# dmsetup ls -tree

mpath1 (252:1)

├─ (8:16) <- sdf

└─ (8:17) <- sdg

mpath2 (252:2)

└─ (8:76)

(abbreviated output)

4. Delete ASM disk:

# oracleasm deletedisk ASMDISK01

Removing ASM disk “ASMDISK01″: [ OK ]

5. Clean-up multipathing

# multipath –f mpath1

# dmsetup remove mpath1

6. Delete SCSI devices from kernel:

echo 1 > /sys/block/sdf/device/delete

echo 1 > /sys/block/sdg/device/delete

7. LUN could be removed from SAN Storage Server now.

8. Make sure mpath1 is removed from multipath list:

# multipath -ll

Note: Label mpath1 is a friendly name which can be setup

in /etc/multipath.conf with option in defaults {} section:

user_friendly_names = yes

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