ASM CREATE DISK FAILED

i am getting this error while trying to create disk
[root@dbanew sysconfig]# /etc/init.d/oracleasm createdisk VOL1 /dev/sda3
Marking disk "/dev/sda3" as an ASM disk: asmtool: Unable to clear device "/dev/sda3": Input/output error
[FAILED]
[root@dbanew sysconfig]#
could any please look into this and help me

try to clear the disk with the command:
dd if=/dev/zero of=/dev/sda3 bs=4096 count=10000
and after that do your createdisk. perhaps there are some infos in the diskheader that prevents
asmlib from doing its work.

Similar Messages

ORA-01501: CREATE DATABASE failed in asm

i am trying to create manual database using asm
and i am using oracle SID
and when i create manual database i am getting the below error
ERROR at line 1:
ORA-01501: CREATE DATABASE failed
ORA-00200: control file could not be created
ORA-00202: control file: '+ASMDG/manual/control1.ctl'
ORA-17502: ksfdcre:4 Failed to create file +ASMDG/manual/control1.ctl
ORA-15001: diskgroup "ASMDG" does not exist or is not mounted
and when i use asm SID +asm and if i create a manual database i am getting the below error
ERROR at line 1:
ORA-15000: command disallowed by current instance type
please help me to resolve this

Hi Friend,
Please check the following permissions for all the below :
Grid Infrastructure Home Owner : grid
Primary Group : oinstall
Secondary Groups : asmadmin, asmdba, asmoper
RDBMS Home Owner : oracle
Primary Group : oinstall
Secondary Groups : dba, oper, asmdba
In case of stand alone set up, if the 11.2 Database be managed by Oracle Restart ( srvctl stop/start ), then 'grid' user should also be a part of 'dba' group.
The ASM Disks would be owned by grid:asmadmin
Please check once again...Before starts
Hope it helps...
Thanks
LaserSoft

How to create ASM device disk groups

I have new Oracle unbreakable linux installed. I have Oracle 11g running. Now I'm wanting to install ASM. When going through dbca - there are no available disk groups. When I click on "Create New" - there are no member disks for me to use. Normally these are already created for me by unix admin, but this is home set-up. Appreciate any help.

Hi,
You need to apply below RPM's and configure the ASMLIB, follow below steps, after the setup install the ASM and then it will show the avaliable disks.
Required RPM for ASM Configuration
oracleasm-support-2.0.1-1.i386.rpm
oracleasm-2.4.21-37.EL-1.0.4-1.i686.rpm
oracleasmlib-2.0.1-1.i386.rpm
Configuring ASMLib
Before using ASMLib, you must run a configuration script to prepare the driver. Run the following command as root, and answer the prompts as shown in the example below. Run this on each node in the cluster.
/etc/init.d/oracleasm configure
Configuring the Oracle ASM library driver
This will configure the on-boot properties of the Oracle ASM library driver. The following questions will determine whether the driver is loaded on boot and what permissions it will have. The current values
will be shown in brackets ('[]'). Hitting <ENTER> without typing an answer will keep that current value. Ctrl-C will abort.
Default user to own the driver interface []: oracle Default group to own the driver interface []: dba Start Oracle ASM library driver on boot (y/n) [n]: y Fix permissions of Oracle ASM disks on boot (y/n) [y]: y
Writing Oracle ASM library driver configuration: [ OK ] Creating /dev/oracleasm mount point: [ OK ] Loading module "oracleasm": [ OK ] Mounting ASMlib driver filesystem: [ OK ] Scanning system for ASM disks: [ OK ]
Next you tell the ASM driver which disks you want it to use. Oracle recommends that each disk contain a single partition for the entire disk. See Partitioning the Disks at the beginning of this section for an example of creating disk partitions.
You mark disks for use by ASMLib by running the following command as root from one of the cluster nodes, run it from node 1:
/etc/init.d/oracleasm createdisk DISK_NAME device_name
Tip: Enter the DISK_NAME in UPPERCASE letters.
Ex:
[root@vmractest1 ASMlib]# /etc/init.d/oracleasm createdisk VOL1 /dev/sdc1
Marking disk "/dev/sdd1" as an ASM disk: [ OK ]
[root@vmractest1 ASMlib]# /etc/init.d/oracleasm createdisk VOL2 /dev/sdd1
Marking disk "/dev/sdd1" as an ASM disk: [ OK ]
[root@vmractest1 ASMlib]# /etc/init.d/oracleasm createdisk VOL3 /dev/sde1
Marking disk "/dev/sde1" as an ASM disk: [ OK ]
Verify that ASMLib has marked the disks:
[root@vmractest1 ASMlib]# /etc/init.d/oracleasm listdisks
VOL1
VOL2
VOL3
On all other cluster nodes, run the following command as root to scan for configured ASMLib disks:
/etc/init.d/oracleasm scandisks
Ex:
[root@vmractest2 ASMlib_install]# /etc/init.d/oracleasm scandisks
Scanning system for ASM disks: [ OK ]
[root@vmractest3 ASMlib_install]# /etc/init.d/oracleasm scandisks
Scanning system for ASM disks: [ OK ]
And then check that everything is as in the first node:
[root@vmractest2 ASMlib_install]# /etc/init.d/oracleasm listdisks
VOL1
VOL2
VOL3
[root@vmractest3 ASMlib_install]# /etc/init.d/oracleasm listdisks
VOL1
VOL2
VOL3
The above steps are clearly explained in the document " http://blogs.oracle.com/content/dav/oracle/mtblog/A/Al/AlejandroVargas/gems/StepbyStepRAConLinux3.pdf " under section *11- Configure ASMlib for ASM Management*
If you still have issues please do let us know.
Regards,
Satya.

Database is not created on ASM configured Disks

hi,
I have installed Oracle 11gR2 Grid Infrastructure and Automatic Storage Management for a Standalone Server through "Grid" user. After then I install Oracle Database 11gR1 Software through "Oracle" User. There is no problem occure during the installation of these software. The OS is OEL-5.4. AND
ASM configured Disks are "DISK1, DISK2 AND DISK3" and the Group Name is "+DATA".
The Problem is when i want to create Database and chose ASM configured disk for Database storage, at the database creation process on 27% an error occur that is "ORA-03114 Not connected to Oracle". Sir but when i chose File System for Database Storage, Database created successfully.
Sir i am new in Oracle Grid Infrastructure and ASM please help me.

Hi buddy,
Are there errors in the alert.log of RDBMS istance, and what about traces ? Have it been generated ?
Regards,
Cerreia

Recovery of data after ASM Disk fails

OS : Sun Solaris
DB: 10.2.0.3 RAC (2 Nodes)
Are there any steps to be followed for recovery of data after ASM Disk fails?
We are using a 2 Node RAC with ASM normal redundancy. Say if one disk of a diskgroup fails, then what steps we need to follow to make sure that Database is aware of the new disk ?

you said you are using NOrmal Redundancy, which is 2 way mirroring. So with that said, your data should be fine as one only disk has failed and got mirrored. So once you replace to disk, oracle should pick that up and move to data back into it....BUT NOT QUIET SURE, just an opinion.

Can't create disks for oracle ASM

Sorry for duplicating my post, I posted it in linux group, but don't know if I also can get help here.
Hi, all advanced,
I am installing oracle 10gR2 in Fedora core 4, and I prefer to use oracle Automatic Storage Management feature. Since oracle doesn't support FC4, I have to set up rRHEL4 kernel core to install ASM driver and configure it. The things went well until I want to create disks for ASM, for example:
# /etc/init.d/oracleasm createdisk DISK1 /dev/hda5
Marking disk "/dev/hda5" as an ASM disk: asmtool: Unable to clear device "/dev/hda5": Input/Output error
When I install the FC4, /dev/hda5 is only one of the partitions in the physical disk, not a full independent physical disk. Same to other disks that I want to put into ASM disks. I google the net but didn't find any similar problem happened to other players. So I need your help!
wand

Hi Rafael,
What version are you using? I have had similar problems in the past. Worst case I had to recreate the widget and copy the coding across.
Can you send me the project file, I will understand also if you do not want to, I will try it on my machine.
Regards
John

Disk Utility - Create Image Fails

Hello all -
I'm trying to make an image of one of my hard drives as a back up. I've followed the instructions in Disk Utility help, but when I click "Save" to try to create the image I get a failure message "Unable to create <Disk Name>. (Resource Busy)".
I've tried saving to the destination with a new folder, that did not solve the problem. No other applications are running and both the source and destination disks are mounted and appearing on my desktop. The source is a USB connected drive, destination is a firewire drive, and I can read and write to both the source and destination disks.
Anyone have any idea what this failure message means and how to correct the problem? Thanks - Randy

If you don't mind I'd like to discourage you from backing up a drive onto a disc image file no matter where you plan to save it. Disc image files can be very problematical when it comes to trying to restore the backup. Furthermore, you cannot boot from a disc image. If the disc image file becomes corrupted then you have no backup.
I would like to propose that you think about a better way to backup your drive. You can clone the drive to your backup drive. It's easy to do using Disk Utility's Restore feature. A clone backup is not only bootable but you have direct access to all the files on the backup.
In order to make a bootable clone open Disk Utility. Select Disk Utility Help from the Help menu. Search for +duplicating a disk+. Click on "Duplicating a disk" at the top of the list of articles. Follow the directions.

ASM DG creation fails on sles11_x86_64 with 11gR1

Hi,
I have sles11x86_64 installed and using Veritas Volume manager raw disks for ASM but ASM dg creation fails with error mentioned below;
ls /dev/vx/rdsk/asmdg/asmvol
/dev/vx/rdsk/asmdg/asmvol
test:~ # ls -l /dev/vx/rdsk/asmdg/asmvol
crw-rw---- 1 oracle oinstall 199, 65533 Feb 26 12:08 /dev/vx/rdsk/asmdg/asmvol
test:~ # su - oracle
oracle@test:~> bash
oracle@test:~> export ORACLE_SID=+ASM
oracle@test:~> export ORACLE_HOME=/oracle/orabin/product/11.1.0/db_1
oracle@test:~> cd /oracle/orabin/product/11.1.0/db_1/bin
cat /etc/oratab
# This file is used by ORACLE utilities. It is created by root.sh
# and updated by the Database Configuration Assistant when creating
# a database.
# A colon, ':', is used as the field terminator. A new line terminates
# the entry. Lines beginning with a pound sign, '#', are comments.
# Entries are of the form:
# $ORACLE_SID:$ORACLE_HOME:<N|Y>:
# The first and second fields are the system identifier and home
# directory of the database respectively. The third filed indicates
# to the dbstart utility that the database should , "Y", or should not,
# "N", be brought up at system boot time.
# Multiple entries with the same $ORACLE_SID are not allowed.
+ASM:/oracle/orabin/product/11.1.0/db_1:N
test./sqlplus /nolog
SQL*Plus: Release 11.1.0.6.0 - Production on Fri Feb 26 12:25:32 2010
Copyright (c) 1982, 2007, Oracle. All rights reserved.
SQL> connect /as sysdba
Connected.
SQL> select name from v$asm_diskgroup;
no rows selected
SQL> select path from v$asm_disk;
PATH
/dev/vx/rdsk/asmdg/asmvol
SQL> create diskgroup asm_dg external redundancy disk '/dev/vx/rdsk/asmdg/asmvol';
create diskgroup asm_dg external redundancy disk '/dev/vx/rdsk/asmdg/asmvol'
ERROR at line 1:
ORA-15018: diskgroup cannot be created
ORA-15201: disk /dev/vx/rdsk/asmdg/asmvol contains a valid RDBMS file
SQL> select name from v$asm_diskgroup;
no rows selected
SQL> create diskgroup asm_dg external redundancy disk '/dev/vx/rdsk/asmdg/asmvol' -f;
create diskgroup asm_dg external redundancy disk '/dev/vx/rdsk/asmdg/asmvol' -f
ERROR at line 1:
ORA-00933: SQL command not properly ended
SQL> create diskgroup asm_dg external redundancy disk '/dev/vx/rdsk/asmdg/asmvol' force;
create diskgroup asm_dg external redundancy disk '/dev/vx/rdsk/asmdg/asmvol' force
ERROR at line 1:
ORA-15018: diskgroup cannot be created
ORA-15080: synchronous I/O operation to a disk failed
ORA-15080: synchronous I/O operation to a disk failed
ORA-15080: synchronous I/O operation to a disk failed
ORA-15080: synchronous I/O operation to a disk failed
SQL> create diskgroup asm_dg external redundancy disk '/dev/vx/rdsk/asmdg/asmvol';
create diskgroup asm_dg external redundancy disk '/dev/vx/rdsk/asmdg/asmvol'
ERROR at line 1:
ORA-15018: diskgroup cannot be created
ORA-15201: disk /dev/vx/rdsk/asmdg/asmvol contains a valid RDBMS file
SQL> create diskgroup asm_dg external redundancy disk '/dev/vx/rdsk/asmdg/asmvol' force;
create diskgroup asm_dg external redundancy disk '/dev/vx/rdsk/asmdg/asmvol' force
ERROR at line 1:
ORA-15018: diskgroup cannot be created
ORA-15080: synchronous I/O operation to a disk failed
ORA-15080: synchronous I/O operation to a disk failed
ORA-15080: synchronous I/O operation to a disk failed
ORA-15080: synchronous I/O operation to a disk failed
SQL>
can some body help on this.
Also wanted to know the background process during ASM creation.
~Dhananjay
Edited by: user9075978 on Feb 26, 2010 4:18 AM

Force the partition table on the second node to be reread
# partprobe
Initialize all shared disks on one node (execute as user root)
dd if=/dev/zero of=/dev/sdc1 bs=1M count=10
dd if=/dev/zero of=/dev/sdc2 bs=1M count=10
dd if=/dev/zero of=/dev/sdc3 bs=1M count=10
dd if=/dev/zero of=/dev/sdc4 bs=1M count=10
dd if=/dev/zero of=/dev/sdd1 bs=1M count=10
dd if=/dev/zero of=/dev/sdd2 bs=1M count=10
dd if=/dev/zero of=/dev/sdd3 bs=1M count=10
dd if=/dev/zero of=/dev/sdd4 bs=1M count=10
dd if=/dev/zero of=/dev/sde1 bs=1M count=10
dd if=/dev/zero of=/dev/sde2 bs=1M count=10
dd if=/dev/zero of=/dev/sde3 bs=1M count=10
dd if=/dev/zero of=/dev/sde4 bs=1M count=10
dd if=/dev/zero of=/dev/sdf3 bs=1M count=10
dd if=/dev/zero of=/dev/sdf4 bs=1M count=10
Install ASM lib (execute as user root) on all cluster nodes
rpm -i /ptc/oms/asmlib/*
Configure ASM lib (set driver owner to oracle and group to dba) on all cluster nodes
/etc/init.d/oracleasm configure
Label ASM lib disks on one node (execute as user root)
/etc/init.d/oracleasm createdisk data01 /dev/sdc3
/etc/init.d/oracleasm createdisk data02 /dev/sdc4
/etc/init.d/oracleasm createdisk flash01 /dev/sdd3
/etc/init.d/oracleasm createdisk flash02 /dev/sdd4
/etc/init.d/oracleasm createdisk flash03 /dev/sde3
/etc/init.d/oracleasm createdisk flash04 /dev/sde4
/etc/init.d/oracleasm createdisk flash05 /dev/sdf3
/etc/init.d/oracleasm createdisk flash06 /dev/sdf4
Scan and list the disks on the other node (execute as user root)
/etc/init.d/oracleasm scandisks
/etc/init.d/oracleasm listdisks
Set up udev to configure block device permissions (as user root)
vi /etc/udev/permissions.d/49-oracle.permissions
sdc1:root:oinstall:0640
sdd1:root:oinstall:0640
# Voting
sdc2:crs:oinstall:0640
sdd2:crs:oinstall:0640
sde2:crs:oinstall:0640
# ASM spfile
sde1:asm:oinstall:0640
# ASM devices
sdc3:asm:oinstall:0640
sdc4:asm:oinstall:0640
sdd3:asm:oinstall:0640
sdd4:asm:oinstall:0640
sde3:asm:oinstall:0640
sde4:asm:oinstall:0640
sdf3:asm:oinstall:0640
sdf4:asm:oinstall:0640
Restart the udev service (execute as user root)
/sbin/udevstart

What's the best way to create disk images?

of 300GB hard drives or partitions?
Disk utility is failing for me with an input/output error.
A typical example:
I have a new HFS+ 500GB external FW 800 drive that I am using a destination.
I will boot from my original 'install' DVD and then open up disk utility to start the disk image creation.
Note: my source is my "Macintosh HD" partition that is around 300GB.
Everything looks like it is running well, then a couple hours into it, it fails... something like:
"cannot create img.. blah input/output error".
Note: Verify Disk shows no errors on the source.
One guess is that the img creation process is failing after I leave the computer and perhaps my computer falls asleep. I tried setting the 'Energy Saver' prefs in the systems prefs, but of course, since I'm running off the install DVD, I wasn't able to get into the prefs.
Anyway, ultimately, I need to create periodic disk images of my macs.. so what are people using to do this?
Thanks for the comments!
Donovan

Eric, Carbon Copy Cloner is what I was leaning towards. The owner says his guess is that there are bad blocks on my HD, and since Disk Utility is block based, that it is failing where CCC is file based, and will just skip files that are corrupted or that it can't copy.
I guess I'll roll with that for now.. but it would be nice if the Disk Utility logs spit out a more descriptive log.. instead of "could not create disk image, input/output error".
Thanks!
Donovan

Can't create disk image of external disk

I just switched from a PowerBook G4 running OS 10.4, to a MacBook Pro running 10.5. I'm trying to create a disk image of the old machine's hard disk, as a backup. Before doing this, I ran Disk Utility to make sure none of my disks were in need of repair.
I started up the old machine in Target Disk mode and connected it to the new one. In Disk Utility, I selected the disk, and clicked Create Disk Image. I told it to save the disk image as uncompressed and writable, on a disk that has plenty of space. So it chugs along for about an hour, creating an 80GB image.
Then once the image is done, I try to mount it and get an error, saying that the disk image has no mountable file systems. I've done this four times already, each time with the same result. In addition, if I try to restart after creating the image, the system hangs.
Any ideas why this might be happening? Are there any known bugs with Disk Utility in Leopard? Interestingly, I tried to do the same thing with Carbon Copy Cloner, and ran into a different error (it thought that it couldn't mount the newly-created image).

Yesterday I bought a Maxtor Basic external harddrive for my mac.
Followed the instructions, using Disk Utility, formatted the hd, then I tried to create a 60 gb blank encrypted disk image but failed twice; after clicking 'Create', Disk Utility does not prompt to create a password.
First time Disk Utility just hangs; there's no respond for 30mins, so i force quit it and reformatted the drive, again.
Then I tried to create a 10mb encrypted disk image and the box appears to enter a password, so I presume it was working fine.
Again, I tired to create the 60gb blank image. This time, i left it overnight, thinking maybe it just takes a longer time. No prompt for passwords, and in the morning, the msg I got was 'No drive found' or something like that, because the drive has ejected itself. (???)
Anyone has any idea why? I could create the image on my mac and throw it in the external drive, but my mac onlyhas 15 gb of space.
Let me know if this sounds like a problem with the Maxtor so I could exchange it ASAP.

ASM LABLED DISK NOT SHOWN IN GRID INSTALLATION

Hi Guru,
Im new to oracle,just started, we are installing ORCALE 11gr2 11.2.0.3 single node cluster for an test environment on RHEL 6.2.
we installed oracle prerequisite with yum provided by oracle with following command.
yum install "oracle-rdbms-server-11gR2-preinstall" ##did all pathch,rpm & parameter set automatically.
create users oracle & grid with required group.
part-ion disk
#fdisk /dev/sd*
n,p,1,<>,<>,w
#partprob /dev/sd*
Install oracleasm with "yum install kmod-oracleasm" including support & asmlib file .
oracleasm configure
ORACLEASM_ENABLED=true
ORACLEASM_UID=grid
ORACLEASM_GID=asmdba
ORACLEASM_SCANBOOT=true
ORACLEASM_SCANORDER=""
ORACLEASM_SCANEXCLUDE=""
ORACLEASM_USE_LOGICAL_BLOCK_SIZE="false"
oracleasm listdisks
DATA01
DATA02
VOTE01
VOTE02
VOTE03
ls -ltr /dev/oracleasm/disks/*
brw-rw---- 1 grid asmdba 8, 17 May 17 15:58 /dev/oracleasm/disks/VOTE01
brw-rw---- 1 grid asmdba 8, 33 May 17 15:58 /dev/oracleasm/disks/VOTE02
brw-rw---- 1 grid asmdba 8, 49 May 17 15:58 /dev/oracleasm/disks/VOTE03
brw-rw---- 1 grid asmdba 8, 65 May 17 15:59 /dev/oracleasm/disks/DATA01
brw-rw---- 1 grid asmdba 8, 81 May 17 15:59 /dev/oracleasm/disks/DATA02
started grid installation with (grid, asmdba) ./runInstaller
Every things seems good till the time.
while it looks for asmdisk during installation it will not show asm labled disk there with discovery string "/dev/oracleasm/disks/*" -----"OCRL:*"
Please help, im stuck in this issue from 5 days.
Regards
Sumit Sharma

Hello,
To resolve this issue, first reconfigure your ASMlib using following steps:
[root@host02 ~]# ll -ltr /dev/oracleasm/disks/ASMDISK0*
brw-rw---- 1 grid asmadmin 8, 17 May 15 11:05 /dev/oracleasm/disks/ASMDISK01
brw-rw---- 1 grid asmadmin 8, 18 May 15 11:05 /dev/oracleasm/disks/ASMDISK02
brw-rw---- 1 grid asmadmin 8, 19 May 15 11:05 /dev/oracleasm/disks/ASMDISK03
brw-rw---- 1 grid asmadmin 8, 21 May 15 11:05 /dev/oracleasm/disks/ASMDISK04
brw-rw---- 1 grid asmadmin 8, 22 May 15 11:05 /dev/oracleasm/disks/ASMDISK05
brw-rw---- 1 grid asmadmin 8, 23 May 15 11:05 /dev/oracleasm/disks/ASMDISK06
brw-rw---- 1 grid asmadmin 8, 24 May 15 11:05 /dev/oracleasm/disks/ASMDISK07
brw-rw---- 1 grid asmadmin 8, 25 May 15 11:05 /dev/oracleasm/disks/ASMDISK08
If the permission is not like this then do the following:
*[root@host02 ~]# oracleasm configure -i*
Configuring the Oracle ASM library driver.
Default user to own the driver interface [asd]: grid
Default group to own the driver interface [asd]: asmadmin
Start Oracle ASM library driver on boot (y/n) [y]: y
Scan for Oracle ASM disks on boot (y/n) [y]: y
Writing Oracle ASM library driver configuration: done
[root@host02 ~]# oracleasm exit
[root@host02 ~]#
[root@host02 ~]#
[root@host02 ~]# oracleasm init
Loading module "oracleasm": oracleasm
Mounting ASMlib driver filesystem: /dev/oracleasm
[root@host02 ~]#
[root@host02 ~]#
[root@host02 ~]#
[root@host02 ~]# oracleasm scandisks
Reloading disk partitions: done
Cleaning any stale ASM disks...
Scanning system for ASM disks...
Instantiating disk "ASMDISK01"
Instantiating disk "ASMDISK02"
Instantiating disk "ASMDISK03"
Instantiating disk "ASMDISK04"
Instantiating disk "ASMDISK05"
Instantiating disk "ASMDISK06"
[root@host02 ~]#
[root@host02 ~]#
[root@host02 ~]#
[root@host02 ~]# oracleasm listdisks
ASMDISK01
ASMDISK02
ASMDISK03
ASMDISK04
ASMDISK05
ASMDISK06
Hope it will work.
Thanks,
Ashish Shukla

How to create disks for disk group ?

Hello Experts
I am RHEL 5 with Oracle 10g, I am configuring ASM. What will be steps to create disks that can be used in disk group and I am using normal redundancy so how many disk groups are needed(min.)

Sunil,
Well to be honest, so far I have not tested ASM over RHEL/OEL 5. I demonstrate ASM over 10g using DD command , creating virtual devices than binding them as a raw decices. So far, this technique is very successful, though I have not tested the same over RHEL5.
The article quoted uses asmlib driver. Its good but not mandatory to work with asm, at least for the learning purpose. So I wont' recommend to do the labor. What you can do is the following,
# mkdir /asmdisks
# chown oracle:dba /asmdisks
# su - oracle
$ dd if=/dev/zero of=/asmdisks/disk1 bs=1k count= 4000
$ dd if=/dev/zero of=/asmdisks/disk2 bs=1k count=4000
$ dd if=/dev/zero of=/asmdisks/disk3 bs=1k count=4000
$ dd if=/dev/zero of=/asmdisks/disk4 bs=1k count=4000
# losetup /dev/loop1 /asmdisks/disk1
# losetup /dev/loop2 /asmdisks/disk2
# losetup /dev/loop3 /asmdisks/disk3
# losetup /dev/loop4 /asmdisks/disk4
# raw /dev/raw/raw1 /dev/loop1
# raw /dev/raw/raw2 /dev/loop2
# raw /dev/raw/raw3 /dev/loop3
# raw /dev/raw/raw4 /dev/loop4
# chown oracle:dba /dev/raw/raw1
# chown oracle:dba /dev/raw/raw2
# chown oracle:dba /dev/raw/raw3
# chown oracle:dba /dev/raw/raw4
# chmod 660 /dev/raw/raw1
# chmod 660 /dev/raw/raw2
# chmod 660 /dev/raw/raw3
# chmod 660 /dev/raw/raw4You should be able to see these logical devices with the DBCA. I have not tested the same over RHEL5 so far so no guarantee that it would work over there or not and I don't have a RHL5 box with me at the moment to test the same too. But over OEL4, RHEL4 this works dandy. Do give it a try and post the feedback.
HTH
Aman....

How ASM Manages Disk Failures

Hi,
Was going through Oracle ASM document and came across this topic, need some clarification on this please.
"The disks are first taken offline and then automatically dropped. In this case, the disk group remains mounted and serviceable. In addition, because of mirroring, all of the disk group data remains accessible. After the disk drop operation, Oracle ASM performs a rebalance to restore full redundancy for the data on the failed disks". -- What does this mean?
Thanks

Simple example.
Single normal redundancy diskgroup DATA1 with 2 failgroups called MIRROR1 and MIRROR2. Each failgroup has 3 x disks (let's say 512GB).
Disk 2 in failgroup MIRROR1 fails. The MIRROR1 failgroup is not available as a result. DB operations continue unaware of the problem as MIRROR2 is online and working fine.
The dba cannot fix disk 2 within the meantime for repair period of ASM. ASM forces disk 2 out the MIRROR1 failgroup by force dropping it. MIRROR1 has now 2 disk remaining.
ASM starts a rebalance process to stripe the contents of the MIRROR1 failgroup across 2 disks - as oppose to 3 disks. If the space in use fits on 2 disks the rebalance operation will succeed. MIRROR1 will become online and available. But it will only be able to carry 1TB of data, as oppose to MIRROR2 with it 3 disks and 1.5TB capacity.
If the space used cannot be striped across the remaining disks in MIRROR1, the rebalance will fail due to insufficient capacity and the failgroup will remain offline.
In either scenario, the recommended action is to add a new 512GB disk to MIRROR1, reverting it back to a 3 disk failgroup, and then rebalance the failgroup.

Cannot create disk image in Disk Utility

I am trying to create a disk image of my macbook pro hard drive to an external firewire drive. The image starts, then I get an error that says "unable to create disk image: Input/Output Error"
I've verified both disks and permissions, but the image creation still fails. I've never had this happen before, and can't find anything about it. Any ideas?
Thanks,
-Jason

Glynn;
You're a genius - THANK YOU!!!!
I just wanted to backup my HD before I upgraded to tiger again .. had my main HD go flakey on me and had to resort to my back up jaguar drive - You're a genius and this worked for me .. as I got the device busy message as well. I figured it was because I was on my start up drive, but didn't have the extra OS drive anymore to switch start up disks to do this.
Thanx so much for your answer!!!
Try this. Open disk utility and highlight your
MacintoshHD(the one you want to copy). In the
options inside the
window(FirstAid-Erase-RAID-Restore) choose restore.
For the source--The Top field--Drag the highlighted
MacintoshHD to the source field.
Destination Field--Drag the image of your lacie
drive(Thats also in the side bar below your
MacintoshHD) to the destination field. click
restore....
g4 Mac OS X (10.3.9)

Can't create disk image with Disk Utility

I just upgraded to OS X Mountain Lion and i can no longer create disk images with Disk Utility in order to store encrypted data.
The operation fails and ends with the post :
Failed to create disk image, error:
hdiutil: create failed - Resource busy
I use three Macs with Mountain Lion, and this problem occurs only on one of the three.
I check the disk, repair permissions and did a reset of the PRAM. I even did a reinstall of Mountain Lion, without success.
But curiously, using a new user account, I was able to create a first disk image. But no one after.

Launch the Console application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Console in the page that opens.
Make sure the title of the Console window is All Messages. If it isn't, select All Messages from the SYSTEM LOG QUERIES menu on the left.
Click the Clear Display icon in the toolbar. Try the action that you're having trouble with again. Post any messages that appear in the Console window – the text, please, not a screenshot.
When posting a log extract, be selective. In most cases, a few dozen lines are more than enough.
DO NOT INDISCRIMINATELY DUMP THOUSANDS OF LINES FROM THE LOG INTO A MESSAGE. If you do that, I will not respond.
Important: Some private information, such as your name, may appear in the log. Edit it out by search-and-replace in a text editor before posting.

ASM CREATE DISK FAILED

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