Oracle ASM and Cluster related Important Links

http://www.pythian.com/blog/oracle-11g-asm-diskgroup-compatibility/
https://twiki.cern.ch/twiki/bin/view/PDBService/ASM_Internals
http://asmsupportguy.blogspot.in/2010/04/asm-metadata.html
http://www.datadisk.co.uk/html_docs/oracle/asm.htm

Automatic Storage Management (ASM) FAQ [ID 1366579.1]

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Questions and Answers

How To Downgrade ASM Instances From 11.1 Release To 10.2 (RAC or Standalone)? 

Please refer to steps outlined in document
 How To Downgrade ASM Instances From 11.1 Release To 10.2 (RAC or Standalone)?  Document 1288664.1

How can I ensure that I use the same disk names across platforms in a Unix RAC cluster? 

Please refer to document
How To Create Alias (mknod) For Candidate or Member ASM Disks on Linux/Unix. Document 1313687.1

How can I verify that new candidate disks are visible cluster wide before trying to add them to a diskgroup? 

Please review
How To Verify If A New Candidate ASM Disk Is Cluster Wide Visible ORA-15075 / ORA-15080 Document 1316936.1

How can I create a new ACFS volume and set the filesystem ownership to non-Grid OS user? 

Please follow the steps outlined in
How To Create A New ACFS Volume And Set The ACFS Filesystem Ownership To A Non-Grid/Oracle OS User? Document 1322383.1

Is there a comprehensive document that outlines steps to install Grid Infrastructure in single instance mode to use ASM? 

Please refer to
ASM 11.2 Configuration KIT (ASM 11gR2 Installation & Configuration, Deinstallation, Upgrade, ASM Job Role Separation (Standalone Only). Document 1092213.1
There are PDF files attached to this document that discuss installation, setting up the environment to separate the roles for ASM from the database as well as steps to deinstall cleanly. 

How can I move a database from a file system to ASM or from ASM to a file system? 

Please review
Steps To Migrate/Move a Database From Non-ASM to ASM And Vice-Versa Document 252219.1

https://communities.oracle.com/portal/server.pt/community/storage_management/288

References

NOTE:1316936.1 - How To Verify If A New Candidate ASM Disk Is Cluster Wide Visible ORA-15075 / ORA-15080
NOTE:1322383.1 - How To Create A New ACFS Volume & Filesystem And Set The ACFS Filesystem Ownership To A Non-Grid/Oracle OS User?
NOTE:252219.1 - Steps To Migrate/Move a Database From Non-ASM to ASM And Vice-Versa
NOTE:1092213.1 - ASM 11.2 Configuration KIT (ASM 11gR2 Installation & Configuration, Deinstallation, Upgrade, ASM Job Role Separation (Standalone Only).
NOTE:1288664.1 - How To Downgrade ASM Instances From 11.1 Release To 10.2 (RAC or Standalone)?
NOTE:1313687.1 - How To Create Alias (mknod) For Candidate Or Member ASM Disks On Linux/Unix.

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ACFS:

Note:? 1369107.1? ACFS Supported On OS Platforms.


ASM:

Note:? 452924.1?? How to Prepare Storage for ASM.
Note:? 1187723.1? Master Note for Automatic Storage Management (ASM).
Note:? 1345562.1? Master Note For Automatic Storage Management (ASM) For Operating System (OS) Administrators.

ACFS:

Note:? 603210.1?? ACFS: How To Unmount/Dismount An ACFS Filesystem?
Note:? 1173978.1? How To Resize An ACFS Filesystem/ASM Volume (ADVM).
Note:? 885363.1?? What diagnostic information to collect for ADVM/ACFS related issues?


ASM:

Note:? 557348.1?? How To Add a New Disk(s) to An Existing Diskgroup on RAC (Best Practices).
Note:? 946213.1?? How To Add Back An ASM Disk or Failgroup (Normal or High Redundancy) After A Transient Failure Occurred (11.1 & 10.2) Or When The DISK_REPAIR_TIME Attribute Expired (10.1 & 11.2)?
Note:? 1382840.1? 11.2.0.3 ASM Grid Infrastructure Installation Allows AU Size Setting Thru The OUI Interface.
Note:? 1313687.1? How To Create Alias (mknod) For Candidate Or Member ASM Disks On Linux/Unix.
Note:? 1366159.1? New 11.2 Grid Infrastructure Installation (root.sh) Is Removing Candidate mknod devices Or Symbolic Link Devices Created At /dev/asm Directory.

ACFS:
Note: 1322383.1? How To Create A New ACFS Volume & Filesystem And Set The ACFS Filesystem Ownership To A Non-Grid/Oracle OS User?
Note: 1371067.1? How To Install/Reinstall Or Deinstall ACFS Modules/Installation Manually?
Note: 1347365.1? How To Manually Create An ACFS Snapshot.
Note: 1350188.1? How To Setup 11.2.0.X ACFS On Windows (64-bit) On RAC.
?
ASM:
?
Note:? 837308.1? Exact Steps To Migrate ASM Diskgroups To Another SAN Without Downtime.
Note:? 567508.1? How To Migrate ASMLIB Devices To Block Devices (Non-ASMLIB)?
Note:? 461718.1? How To Install ASMLIB API via the Unbreakable Linux Network
Note:? 726915.1? ASMLIB Installation Demo & ASMLIB Troubleshooting
Note:? 566676.1? How To Determinate If An EMCPOWER Partition Is Valid For ASMLIB?
Note:? 1349613.1? How To Gather The OS Logs For Each Specific OS Platform.
Note:? 1349705.1? ASM Installation Logs Location.
Note:? 1180491.1? KFED Tool For Windows OS.
Note:? 1395851.1? ASMCA Can Not Discover All The ASMLIB Disks On The Second RAC Node (ASM 11.2).
Note:? 745271.1? How To Reconfigure the Cluster Synchronization Service (CSS) on Non-RAC & Trace It (Linux/Unix)?
Note:? 948040.1? How To Rename A Diskgroup On ASM 11gR2?
Note:? 470211.1? How To Gather/Backup ASM Metadata In A Formatted Manner? ?
Note:? 1355977.1? Steps To Shutdown/Startup The CRS, OHAS, ASM & RDBMS Services on RAC 11.2 Configuration.
Note:? 603210.1? How To Identify If A Disk/Partition Is Still Used By ASM, Has Been Used by ASM Or Has Not Been Used by ASM (Unix/Linux)?
Note:? 1382372.1? Unable To Open Database Due To Diskgroup Used To Multiplex The RedoLogs & Controlfiles & Archivelogs Got Corrupted.
Note:? 1422415.1? Alternative Way To Upgrade An ASM RAC Configuration From Release 10.2 Or 11.1 To Release 11.2.
Note:? 1434351.1? Alternative Way To Upgrade An ASM Standalone Configuration From Release 11.2.0.1 or 11.2.0.2 to release 11.2.0.3.

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Cluster Info Blogs:
http://oracle-info.com/2013/03/19/rac-find-when-the-crs-resource-was-last-started-or-status-changes/

http://aprakash.wordpress.com/2011/02/23/crs-11gr2/

http://dbatrain.wordpress.com/2010/08/13/get-started-with-oracle-restart/ --> Cluster startup sequence.