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Don Burleson Blog 







Oracle to desupport RAW data files

Oracle Database Tips by Donald BurlesonMay 30,  2015

According to MOSC 754305.1, Oracle is planning to deprecate the ability to create raw disk partitions in the next major release of Oracle.  Traditionally, raw devices have been used with RAC databases, and the raw devices are managed with a raw file system metadata tool (Veritas)or by using ASM.

Oracle ACE and OCM Steve Karam has a note about this desupport of raw devices in Oracle 12g:

A colleague sent me an interesting note today. Specifically, MOSC Note 578455.1, which announces that Oracle 12g will not support raw volumes for Datafiles, controlfiles, redo logs, OR voting disks and OCR.

Those of us acquainted with RAC might be shouting "WHAT?!?!" at about this time. This is because without raw volumes, our only choices for OCR and voting disk placement seems to be a CFS (such as OCFS).

However, wording in the MOSC note indicates that ASM will be able to support the OCR and voting disk ("and other database files") in 12g. The note hints at broader support for NFS in 12g as well.

Oracle guru Jeremy Schneider has these excellent insights on Oracle-l about the planned desupport of raw disks:

As stated in MOSC note <578455.1>, Oracle plans to fully desupport RAW/Block device storage effective with the next major release following 11.2.

At this time, customers will need to migrate any data files stored on RAW/Block devices to ASM, a cluster file system, or NFS.

Thus, we recommend new databases not be deployed on RAW/Block devices. 

Also, just a technicality, but if you're on Linux then raw access has long been deprecated in favor of direct block access.



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