How to Set Up Oracle ASM on Ubuntu Gutsy Gibbon

8/18/2019 How to Set Up Oracle ASM on Ubuntu Gutsy Gibbon

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w To Set Up Oracle ASM on Ubuntu Gutsy Gibbon

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HOW TO SET UP ORACLE ASM ON UBUNTU GUTSY GIBBONby Grégory Guillou

Posted in: Technical Track

Tags: OracleI’ve recently moved to Ubuntu Linux, and this post describes my attempt to play

around with Oracle ASM on Ubuntu. For this demonstration, I used Oracle 11.1.0.6

on Gutsy Gibbon. I hope it will be useful to somebody out there.

I m p o r t a n t N o t i c e : What I describe below is among the worst thing you can ever

do with ASM. You can use it to play around but n e v e r use it with anything other

than test data. If you lose something because of me, you’ll be the only one to

blame !

Question #1: How do you simulate a disk from a file?

If you have a free partition or disk to be used as an ASM disk, just skip this step. If

you don’t, you can create a file with the dd command and create a device that

actually loops to the file with the l oset up command.

Let’s assume you’ve created a directory named / asmdi sks (and you have write

access to it). Run the command below to create a file named disk1 that is 3GB in

size:

$ dd if=/dev/zero of=/asmdisks/disk1 bs=1024k count=3072

3072+0 records i n

3072+0 r ecor ds out

3221225472 byt es ( 3. 2 GB) copi ed, 80. 9113 seconds, 39. 8 MB/ s

Once you’ve created the file, map it to a device named loopN in / dev. You can list

the used loop devices with the l oset up - a command.

Once you’ve made sure the one you plan to used is free, e.g. / dev/ l oop1, you can

map the device to the file with the following commands (you have to be root) :

# losetup /dev/loop1 /asmdisks/disk1

# losetup -a

/ dev/ l oop1: [ 0802] : 7438407 ( / asmdi sks/ di sk1)

Question #2: How do you create an interface to the disk that is

usable by ASM?

Actually, the preferred way to access a disk from ASM on Linux is ASMLib. To be

fair, I must say I didn’t even give it a try. Of course, I’d be more than interested if

February 7, 2008|

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Note 3: If you want the CSSD daemon to startup automatically, you’ll have to create

a service in Ubuntu.

Question #4: How do you create the ASM instance, add a

diskgroup, etc?

This is not really the subject of this post, but assuming you’ve already installed Oracle 11g accordingly to Augusto’s Installing Oracle 11g on Ubuntu Linux 7.10

(Gutsy Gibbon) and you’ve setup the PATH, ORACLE_HOME and ORACLE_BASE

variables, you can do everything in one command:

$ dbca - si l ent - conf i gur eASM \

- asmSysPassword change_on_i nst al l \

- di skSt r i ng "/ dev/ l oop*" \

- di skLi st / dev/ l oop1 \

- di skGr oupName DG1 \ - r edundancy EXTERNAL

Once that is done, you can connect to the ASM instance with SQL*Plus:

$ source oraenv

ORACLE_SI D = [ or acl e] ?+ASM

The Or acl e base f or ORACLE_HOME=/ u01/ app/ or acl e/ pr oduct / 11. 1. 0/ db_1 i s

/ u01/ app/ or acl e

$ sql pl us / as sysdba

SQL> sel ect NAME, TOTAL_MB

f r om v$asm_di skgr oup;

NAME TOTAL_MB

- - - - - - - - - - - -

DG1 3072

Or you can use ASMCMD as below:

$ source oraenvORACLE_SI D = [ or acl e] ?+ASM

The Or acl e base f or ORACLE_HOME=/ u01/ app/ or acl e/ pr oduct / 11. 1. 0/ db_1 i s

/ u01/ app/ or acl e

$ asmcmd

ASMCMD> l s

DG1/

Question #5: How do you create a database that uses ASM?I cannot resist providing the syntax for 11g (t ot al Memory will have to be replaced

by memor yPer cent age in 10g):

http://www.pythian.com/blogs/654/installing-oracle-11g-on-ubuntu-linux-710-gutsy-gibbon/http://www.pythian.com/blogs/654/installing-oracle-11g-on-ubuntu-linux-710-gutsy-gibbon/http://www.pythian.com/blogs/654/installing-oracle-11g-on-ubuntu-linux-710-gutsy-gibbon/http://www.pythian.com/blogs/654/installing-oracle-11g-on-ubuntu-linux-710-gutsy-gibbon/


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$ dbca -silent -createDatabase \

-templateName General_Purpose.dbc \

-gdbName BLUJ \

-sysPassword change_on_install \

-systemPassword manager \

-emConfiguration NONE \

-storageType ASM \

-asmSysPassword change_on_install \

-diskGroupName DG1 \

-characterSet WE8ISO8859P15 \

-totalMemory 250

ul i mi t : 1: I l l egal opt i on - u




Copyi ng dat abase f i l es

1% compl ete

3% compl ete

37% compl ete

Cr eat i ng and st ar t i ng Or acl e i nst ance

40% compl ete

45% compl ete

50% compl ete55% compl ete

56% compl ete

60% compl ete

62% compl ete

Compl et i ng Database Cr eat i on

66% compl ete

70% compl ete

73% compl ete77% compl ete

88% compl ete

100% compl et e

Look at t he l og f i l e "/ u01/ app/ or acl e/ cf gt ool l ogs/ dbca/ BLUJ / BLUJ . l og"

f or f ur t her det ai l s .

Question #2 (Revisited): How do you create an interface to the

disk that is usable by ASM ?For 11g ASM offline tests, raw devices can actually be useful. And, despite the

missing pieces, creating a raw device that maps the loop device (or real


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// hi /bl /h l b ibb /[25/02/2016 14 42 45]

disk/partition) is straightforward. The first step consists in filling the holes in

Ubuntu, i.e. in creating some character files that are not created by default on

Gutsy Gibbon (r awct l , r aw0 . . . r aw1).

Run the set of commands below as r oot :

# mknod / dev/ r awct l c 162 0

# mknod / dev/ r aw/ r aw0 c 162 1

# mknod / dev/ r aw/ r aw1 c 162 2

# l n - s / dev/ r awct l / dev/ r aw/ r awct l

Once the missing pieces rebuilt, mapping a raw devices to your disk or loop

interface is as easy as:

# r aw / dev/ r aw/ r aw1 / dev/ l oop1

Or if you use a partition named / dev/ sdb1:

# r aw / dev/ r aw/ r aw1 / dev/ sdb1

You can display the result of your settings with the command below.

# raw -qa

/ dev/ r aw/ r aw1: bound t o maj or 7, mi nor 0

The raw devices won’t change anything but the path to the device when you’ll go

from Question #3 to Question #5.

Note 4: If you want the raw devices to be setup automatically at boot time, you’ll

have to define the correct rules in /etc/udev/rules.d .

Conclusion

What I really like about Oracle is that once you’ve done something, you have ten

different ways to go. I hope this post will enable you to explore some 11g’s new

features on your favorite operating system.

Related Posts:

1. Breaking News: How Fast Can Your Query be With Exadata?

2. Adding Columns with Default Values and Not Null in Oracle 11g

3. Log Buffer #152: A Carnival of the Vanities for DBAs

4. Performance Problems with Dynamic Statistics in Oracle 12c

Interested in working with Grégory? Schedule a tech call.
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How to Set Up Oracle ASM on Ubuntu Gutsy Gibbon