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sources/tech/20190520 How To Map Oracle ASM Disk Against Physical Disk And LUNs In Linux.md
230 lines
7.8 KiB
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230 lines
7.8 KiB
Markdown
[#]: collector: (lujun9972)
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[#]: translator: ( )
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[#]: reviewer: ( )
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[#]: publisher: ( )
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[#]: url: ( )
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[#]: subject: (How To Map Oracle ASM Disk Against Physical Disk And LUNs In Linux?)
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[#]: via: (https://www.2daygeek.com/shell-script-map-oracle-asm-disks-physical-disk-lun-in-linux/)
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[#]: author: (Magesh Maruthamuthu https://www.2daygeek.com/author/magesh/)
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How To Map Oracle ASM Disk Against Physical Disk And LUNs In Linux?
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======
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You might already know about ASM, Device Mapper Multipathing (DM-Multipathing) if you are working quit long time as a Linux administrator.
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There are multiple ways to check these information. However, you will be getting part of the information when you use the default commands.
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It doesn’t show you all together in the single output.
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If you want to check all together in the single output then we need to write a small shell script to achieve this.
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We have added two shell script to get those information and you can use which one is suitable for you.
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Major and Minor numbers can be used to match the physical devices in Linux system.
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This tutorial helps you to find which ASM disk maps to which Linux partition or DM Device.
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If you want to **[manage Oracle ASM disks][1]** (such as start, enable, stop, list, query and etc) then navigate to following URL.
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### What Is ASMLib?
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ASMLib is an optional support library for the Automatic Storage Management feature of the Oracle Database.
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Automatic Storage Management (ASM) simplifies database administration and greatly reduces kernel resource usage (e.g. the number of open file descriptors).
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It eliminates the need for the DBA to directly manage potentially thousands of Oracle database files, requiring only the management of groups of disks allocated to the Oracle Database.
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ASMLib allows an Oracle Database using ASM more efficient and capable access to the disk groups it is using.
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### What Is Device Mapper Multipathing (DM-Multipathing)?
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Device Mapper Multipathing or DM-multipathing is a Linux host-side native multipath tool, which allows us to configure multiple I/O paths between server nodes and storage arrays into a single device by utilizing device-mapper.
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### Method-1 : Shell Script To Map ASM Disks To Physical Devices?
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In this shell script we are using for loop to achieve the results.
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Also, we are not using any ASM related commands.
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```
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# vi asm_disk_mapping.sh
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#!/bin/bash
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ls -lh /dev/oracleasm/disks > /tmp/asmdisks1.txt
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for ASMdisk in `cat /tmp/asmdisks1.txt | tail -n +2 | awk '{print $10}'`
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do
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minor=$(grep -i "$ASMdisk" /tmp/asmdisks1.txt | awk '{print $6}')
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major=$(grep -i "$ASMdisk" /tmp/asmdisks1.txt | awk '{print $5}' | cut -d"," -f1)
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phy_disk=$(ls -l /dev/* | grep ^b | grep "$major, *$minor" | awk '{print $10}')
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echo "ASM disk $ASMdisk is associated on $phy_disk [$major, $minor]"
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done
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```
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Set an executable permission to port_scan.sh file.
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```
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$ chmod +x asm_disk_mapping.sh
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```
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Finally run the script to achieve this.
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```
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# sh asm_disk_mapping.sh
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ASM disk MP4E6D_DATA01 is associated on /dev/dm-1
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3600a0123456789012345567890234q11 [253, 1]
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ASM disk MP4E6E_DATA02 is associated on /dev/dm-2
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3600a0123456789012345567890234q12 [253, 2]
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ASM disk MP4E6F_DATA03 is associated on /dev/dm-3
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3600a0123456789012345567890234q13 [253, 3]
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ASM disk MP4E70_DATA04 is associated on /dev/dm-4
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3600a0123456789012345567890234q14 [253, 4]
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ASM disk MP4E71_DATA05 is associated on /dev/dm-5
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3600a0123456789012345567890234q15 [253, 5]
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ASM disk MP4E72_DATA06 is associated on /dev/dm-6
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3600a0123456789012345567890234q16 [253, 6]
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ASM disk MP4E73_DATA07 is associated on /dev/dm-7
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3600a0123456789012345567890234q17 [253, 7]
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```
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### Method-2 : Shell Script To Map ASM Disks To Physical Devices?
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In this shell script we are using while loop to achieve the results.
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Also, we are using ASM related commands.
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```
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# vi asm_disk_mapping_1.sh
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#!/bin/bash
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/etc/init.d/oracleasm listdisks > /tmp/asmdisks.txt
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while read -r ASM_disk
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do
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major="$(/etc/init.d/oracleasm querydisk -d $ASM_disk | awk -F[ '{ print $2 }'| awk -F] '{ print $1 }' | cut -d"," -f1)"
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minor="$(/etc/init.d/oracleasm querydisk -d $ASM_disk | awk -F[ '{ print $2 }'| awk -F] '{ print $1 }' | cut -d"," -f2)"
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phy_disk="$(ls -l /dev/* | grep ^b | grep "$major, *$minor" | awk '{ print $10 }')"
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echo "ASM disk $ASM_disk is associated on $phy_disk [$major, $minor]"
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done < /tmp/asmdisks.txt
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```
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Set an executable permission to port_scan.sh file.
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```
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$ chmod +x asm_disk_mapping_1.sh
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```
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Finally run the script to achieve this.
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```
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# sh asm_disk_mapping_1.sh
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ASM disk MP4E6D_DATA01 is associated on /dev/dm-1
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3600a0123456789012345567890234q11 [253, 1]
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ASM disk MP4E6E_DATA02 is associated on /dev/dm-2
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3600a0123456789012345567890234q12 [253, 2]
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ASM disk MP4E6F_DATA03 is associated on /dev/dm-3
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3600a0123456789012345567890234q13 [253, 3]
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ASM disk MP4E70_DATA04 is associated on /dev/dm-4
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3600a0123456789012345567890234q14 [253, 4]
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ASM disk MP4E71_DATA05 is associated on /dev/dm-5
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3600a0123456789012345567890234q15 [253, 5]
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ASM disk MP4E72_DATA06 is associated on /dev/dm-6
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3600a0123456789012345567890234q16 [253, 6]
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ASM disk MP4E73_DATA07 is associated on /dev/dm-7
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3600a0123456789012345567890234q17 [253, 7]
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```
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### How To List Oracle ASM Disks?
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If you would like to list only Oracle ASM disk then use the below command to List available/created Oracle ASM disks in Linux.
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```
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# oracleasm listdisks
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ASM_Disk1
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ASM_Disk2
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ASM_Disk3
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ASM_Disk4
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ASM_Disk5
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ASM_Disk6
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ASM_Disk7
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```
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### How To List Oracle ASM Disks Against Major And Minor Number?
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If you would like to map Oracle ASM disks against major and minor number then use the below commands to List available/created Oracle ASM disks in Linux.
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```
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# for ASMdisk in `oracleasm listdisks`; do /etc/init.d/oracleasm querydisk -d $ASMdisk; done
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Disk "ASM_Disk1" is a valid Disk on device [253, 1]
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Disk "ASM_Disk2" is a valid Disk on device [253, 2]
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Disk "ASM_Disk3" is a valid Disk on device [253, 3]
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Disk "ASM_Disk4" is a valid Disk on device [253, 4]
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Disk "ASM_Disk5" is a valid Disk on device [253, 5]
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Disk "ASM_Disk6" is a valid Disk on device [253, 6]
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Disk "ASM_Disk7" is a valid Disk on device [253, 7]
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```
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Alternatively, we can get the same results using the ls command.
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```
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# ls -lh /dev/oracleasm/disks
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total 0
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brw-rw---- 1 oracle oinstall 253, 1 May 19 14:44 ASM_Disk1
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brw-rw---- 1 oracle oinstall 253, 2 May 19 14:44 ASM_Disk2
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brw-rw---- 1 oracle oinstall 253, 3 May 19 14:44 ASM_Disk3
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brw-rw---- 1 oracle oinstall 253, 4 May 19 14:44 ASM_Disk4
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brw-rw---- 1 oracle oinstall 253, 5 May 19 14:44 ASM_Disk5
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brw-rw---- 1 oracle oinstall 253, 6 May 19 14:44 ASM_Disk6
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brw-rw---- 1 oracle oinstall 253, 7 May 19 14:44 ASM_Disk7
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```
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### How To List Physical Disks Against LUNs?
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If you would like to map physical disks against LUNs then use the below command.
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```
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# multipath -ll | grep NETAPP
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3600a0123456789012345567890234q11 dm-1 NETAPP,LUN C-Mode
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3600a0123456789012345567890234q12 dm-2 NETAPP,LUN C-Mode
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3600a0123456789012345567890234q13 dm-3 NETAPP,LUN C-Mode
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3600a0123456789012345567890234q14 dm-4 NETAPP,LUN C-Mode
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3600a0123456789012345567890234q15 dm-5 NETAPP,LUN C-Mode
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3600a0123456789012345567890234q16 dm-6 NETAPP,LUN C-Mode
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3600a0123456789012345567890234q17 dm-7 NETAPP,LUN C-Mode
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```
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--------------------------------------------------------------------------------
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via: https://www.2daygeek.com/shell-script-map-oracle-asm-disks-physical-disk-lun-in-linux/
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作者：[Magesh Maruthamuthu][a]
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选题：[lujun9972][b]
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]: https://www.2daygeek.com/author/magesh/
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[b]: https://github.com/lujun9972
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[1]: https://www.2daygeek.com/start-stop-restart-enable-reload-oracleasm-service-linux-create-scan-list-query-rename-delete-configure-oracleasm-disk/
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