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UDEV SCSI Rules Confguration or ASM in OracleLinux 5, 6 an !

For Oracle Automatic Storage Manager (ASM) to use disks, it needs to be able to

identify the devices consistently and for them to have the correct ownership andpermissions. In Linux you can use ASMLib to manage these tasks, but it is seen as an

additional layer of complexity and has never really gained any popularity. Instead, many

people use the Linux device manager "udev" to perform these tasks. This article

presents a brief overview of setting up udev rules with respect to disks for use with ASM

in Oracle 11g. The examples are all done using Oracle Linux 5, 6 and 7, so they will be

consistent with RHEL and CentOS 5, 6 and 7.

• Background

• Identify the Disks (/sbin/scsi_id)

• Make SCSI Devices Trusted

• Create UDEV Rules File

• Load Updated Block Device Partitions (/sbin/partprobe)

• Test Rules (udevtest)

• Restart UDEV Service

• Check Ownership and Permissions

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2/19

Essentially, what udev does is apply rules defined in files in the "/etc/udev/rules.d"

directory to the device nodes listed in the "/dev" directory. The rules can be defined in a

variety of ways, but what we need to do is identify the device and say what we want

udev to do with it.

In this case I know all my disk devices are named "/dev/sd?1", where the "?" represents

a letter from a-d, so I can identify the devices of interest using the following rule

parameters.

$ER%EL&&'s()', "US&&'scsi'

I want to tie each specific device to an alias, so it is always identified the same way,

regardless of the device name Linux assigns it. So I need to be able to test each device

that matches the previous pattern to see if it is the disk I am interested in. Each disk has

a unique SCSI ID, so I can place a test into the rule, telling it how to perform the test,

and the result it should return for a positive match. The following rule parameters explain

how to test the device and what result constitutes a match in Oracle Linux 5.

*RO+RAM&&'s-inscsi.i /g /u /s -loc#01arent',RESUL2&&'SA2A.V"O3.4ARDDIS$.V"6-e/6!e.'

Thescsi.i command works a little differently in Oracle Linux 6, so for that the following

test works better.

*RO+RAM&&'s-inscsi.i /g /u / e701arent',RESUL2&&'SA2A.V"O3.4ARDDIS$.V"6-e/6!e.'

Thescsi.i command is located in a different place in Oracle Linux 7, so for that the

following test is correct.

*RO+RAM&&'usrli-ue7scsi.i /g /u / e701arent',RESUL2&&'SA2A.V"O3.4ARDDIS$.V"6-e/6!e.'

Once we have identified the specific device of interest, we need to indicate what actionsshould be performed on it. The following parameters specify an alias, the ownership and

the permissions for the device.

%AME&'as8/is#)', O9%ER&'oracle', +ROU*&'-a', MODE&'66'

So the whole rule for each disk will look something like this in Oracle Linux 5.


3/19

$ER%EL&&'s()', "US&&'scsi', *RO+RAM&&'s-inscsi.i /g /u /s -loc#01arent', RESUL2&&'SA2A.V"O3.4ARDDIS$.V"6-e/6!e.',%AME&'as8/is#)', O9%ER&'oracle', +ROU*&'-a', MODE&'66'

Or this in Oracle Linux 6.

$ER%EL&&'s()', "US&&'scsi', *RO+RAM&&'s-inscsi.i /g /u / e701arent', RESUL2&&'SA2A.V"O3.4ARDDIS$.V"6-e/6!e.',%AME&'as8/is#)', O9%ER&'oracle', +ROU*&'-a', MODE&'66'

Or this in Oracle Linux 7.

$ER%EL&&'s()', SU"S:S2EM&&'-loc#', *RO+RAM&&'usrli-ue7scsi.i /g/u / e701arent', RESUL2&&'SA2A.V"O3.4ARDDIS$.V"6-e/6!e.', S:MLI%$;&'as8/is#)', O9%ER&'oracle', +ROU*&'-a',MODE&'66'

This means that the device pointing to the partition "sd*1" on the disk with the SCSI ID

of "SATA_VBOX_HARDDISK_VBd306dbe0-df3367e3_" will always be called "/dev/asm-

disk1", regardless of the letter "?" Linux assigns when the device is discovered. In

addition, the device will have the correct ownership and permissions for ASM.

There are a number of wildcards and matching patterns that can be used if you don't

want to write device-specific rules.

Now we know roughly what we are trying to achieve, we will look at each step

necessary for setting up the disks for ASM to use.

Ienti< t=e Dis#s >s-inscsi.i?

We are going to write device-specific rules, so we need to be able to identify each

device consistently, irrespective of the order in which Linux discovers it. To do this we

are going to use the SCSI ID for each disk (not the partition), which we get using the

scsi.i command. The "-s" option makes the paths relative to the "/sys" directory. For

Oracle Linux 5, use the following command.

@ s-inscsi.i /g /u /s -loc#s-

SA2A.V"O3.4ARDDIS$.V"6-e/6!e.

@ s-inscsi.i /g /u /s -loc#sc


4/19

SA2A.V"O3.4ARDDIS$.V"6ec!e/)Be.

@ s-inscsi.i /g /u /s -loc#s

SA2A.V"O3.4ARDDIS$.V"cec6--/ac6!a)!.

@ s-inscsi.i /g /u /s -loc#se

SA2A.V"O3.4ARDDIS$.V"!!a-!/B5-)BBc.

@

The "-s" is not available in Oracle Linux 6, so you must use the following syntax.

@ s-inscsi.i /g /u / e7s-


@ s-inscsi.i /g /u / e7sc


@ s-inscsi.i /g /u / e7s


@ s-inscsi.i /g /u / e7se


@

The location of thescsi.i command has changed in Oracle Linux 7, so you must use

the following syntax.

@ usrli-ue7scsi.i /g /u / e7s-


@ usrli-ue7scsi.i /g /u / e7sc


@ usrli-ue7scsi.i /g /u / e7s


@ usrli-ue7scsi.i /g /u / e7se


@


5/19

Ma#e SCSI De7ices 2ruste

Add the following to the "/etc/scsi_id.config" file to configure SCSI devices as trusted.

Create the file if it doesn't already exist.

o1tions&/g

Create UDEV Rules ile

Create the "/etc/udev/rules.d/99-oracle-asmdevices.rules" file.

@ 7i etcue7rulesFBB/oracle/as8e7icesFrules

The file should contain the following lines for Oracle Linux 5. The*RO+RAM parameter

must match the command you used to retrieve the SCSI ID, and theRESUL2 parameter

must match the value returned from your disks.

$ER%EL&&'s()', "US&&'scsi', *RO+RAM&&'s-inscsi.i /g /u /s -loc#01arent', RESUL2&&'SA2A.V"O3.4ARDDIS$.V"6-e/6!e.',%AME&'as8/is#)', O9%ER&'oracle', +ROU*&'-a', MODE&'66'

$ER%EL&&'s()', "US&&'scsi', *RO+RAM&&'s-inscsi.i /g /u /s -loc#01arent', RESUL2&&'SA2A.V"O3.4ARDDIS$.V"6ec!e/)Be.',%AME&'as8/is#', O9%ER&'oracle', +ROU*&'-a', MODE&'66'

$ER%EL&&'s()', "US&&'scsi', *RO+RAM&&'s-inscsi.i /g /u /s -loc#01arent', RESUL2&&'SA2A.V"O3.4ARDDIS$.V"cec6--/ac6!a)!.',%AME&'as8/is#', O9%ER&'oracle', +ROU*&'-a', MODE&'66'

$ER%EL&&'s()', "US&&'scsi', *RO+RAM&&'s-inscsi.i /g /u /s -loc#01arent', RESUL2&&'SA2A.V"O3.4ARDDIS$.V"!!a-!/B5-)BBc.',%AME&'as8/is#', O9%ER&'oracle', +ROU*&'-a', MODE&'66'

The equivalent for Oracle Linux 6 is shown below.

$ER%EL&&'s()', "US&&'scsi', *RO+RAM&&'s-inscsi.i /g /u / e7

01arent', RESUL2&&'SA2A.V"O3.4ARDDIS$.V"6-e/6!e.',%AME&'as8/is#)', O9%ER&'oracle', +ROU*&'-a', MODE&'66'

$ER%EL&&'s()', "US&&'scsi', *RO+RAM&&'s-inscsi.i /g /u / e701arent', RESUL2&&'SA2A.V"O3.4ARDDIS$.V"6ec!e/)Be.',%AME&'as8/is#', O9%ER&'oracle', +ROU*&'-a', MODE&'66'


6/19

$ER%EL&&'s()', "US&&'scsi', *RO+RAM&&'s-inscsi.i /g /u / e701arent', RESUL2&&'SA2A.V"O3.4ARDDIS$.V"cec6--/ac6!a)!.',%AME&'as8/is#', O9%ER&'oracle', +ROU*&'-a', MODE&'66'

$ER%EL&&'s()', "US&&'scsi', *RO+RAM&&'s-inscsi.i /g /u / e7

01arent', RESUL2&&'SA2A.V"O3.4ARDDIS$.V"!!a-!/B5-)BBc.',%AME&'as8/is#', O9%ER&'oracle', +ROU*&'-a', MODE&'66'

The equivalent for Oracle Linux 7 is shown below.

$ER%EL&&'s()', SU"S:S2EM&&'-loc#', *RO+RAM&&'usrli-ue7scsi.i /g/u / e701arent', RESUL2&&'SA2A.V"O3.4ARDDIS$.V"6-e/6!e.', S:MLI%$;&'as8/is#)', O9%ER&'oracle', +ROU*&'-a',MODE&'66'

$ER%EL&&'s()', SU"S:S2EM&&'-loc#', *RO+RAM&&'usrli-ue7scsi.i /g

/u / e701arent', RESUL2&&'SA2A.V"O3.4ARDDIS$.V"6ec!e/)Be.', S:MLI%$;&'as8/is#', O9%ER&'oracle', +ROU*&'-a',MODE&'66'

$ER%EL&&'s()', SU"S:S2EM&&'-loc#', *RO+RAM&&'usrli-ue7scsi.i /g/u / e701arent', RESUL2&&'SA2A.V"O3.4ARDDIS$.V"cec6--/ac6!a)!',S:MLI%$;&'as8/is#', O9%ER&'oracle', +ROU*&'-a', MODE&'66'

$ER%EL&&'s()', SU"S:S2EM&&'-loc#', *RO+RAM&&'usrli-ue7scsi.i /g/u / e701arent', RESUL2&&'SA2A.V"O3.4ARDDIS$.V"!!a-!/B5-)BBc.', S:MLI%$;&'as8/is#', O9%ER&'oracle', +ROU*&'-a',MODE&'66'

Loa U1ate "loc# De7ice *artitions >s-in1art1ro-e?

Load updated block device partition tables.

@ s-in1art1ro-e e7s-)

@ s-in1art1ro-e e7sc)

@ s-in1art1ro-e e7s)

@ s-in1art1ro-e e7se)

2est Rules >ue7test?

Test the rules are working as expected.


7/19

@ @OL5

@ ue7test -loc#s-s-)

@ ue7test -loc#scsc)

@ ue7test -loc#ss)

@ ue7test -loc#sese)

@ @OL6 an OL!

@ ue7a8 test -loc#s-s-)

@ ue7a8 test -loc#scsc)

@ ue7a8 test -loc#ss)

@ ue7a8 test -loc#sese)

The output from the first disk should look something like this.

@ ue7test -loc#s-s-)

8ainG loo#ing at e7ice H-loc#s-s-)H ro8 su-s


8/19

ue7.noe.aG creating s


9/19

-r/r//// ) oracle -a , )! A1r G! as8/is#)

-r/r//// ) oracle -a , A1r G! as8/is#

-r/r//// ) oracle -a , B A1r G! as8/is#

-r/r//// ) oracle -a , 65 A1r G! as8/is#

@

So theASM.DIS$S2RI%+ initialization parameter in the ASM instance can be set to

'/dev/asm-disk*' to identify the ASM disks.

For more information see:

• udev

• Configuring Disk Devices Manually for Oracle ASM

Hope this helps. Regards Tim...

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9eic=eng =ong Co88ents*osts

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10/19

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Oracle ASM on

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As the root user, install the device-

mapper-multipath package using the yumpackage manager

[root@vzwc1 ~]# cat /etc/redhat-releaseRed Hat Enterprise Linux erver release !"

$antia%o&[root@vzwc1 ~]# una'e -p

x(!)!

[root@vzwc1 ~]# *u' install device-'apper-'ultipath

Copy the multipath.conf file found

within /usr/share/doc/device-mapper-

multipath-0.4.9/ to /etc/[root@vzwc1 ~]# cp /usr/share/doc/device-'apper-'ultipath-+"",/'ultipath"con /etc/'ultipath"con

Capture the scsi id of the local disks on

the system.

[root@vzwc. ~]# or i in c d e % h i 0 do

scsi)id 2whitelisted 2replace-whitespace 2device3/dev/sd4i

done1565)789:)H5R;;.,+c1-..(1565)789:)H5R;;!ad>-?d.>c?11565)789:)H5R;;>c(1c->ce,..

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15/19

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文章归档

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16/19

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