Oracle DB 12c新特性：raw device 裸裝置不再受支援，oracle12c

Oracle DB 12c新特性：raw device 裸裝置不再受支援，oracle12c

Oracle DB 12c新特性：raw device 不再受支援。

參考自：
Announcement of De-Support of using RAW devices in Oracle Database Version 12.1 (Doc ID 578455.1)

細節：
De-Support of Raw
本文的目錄是通知在oracle database 12.1版本中對raw device不再支援。
這意味著，若是使用oracle database 12.1版本，將不能把資料檔案，OCR 或者 voting disk 放在raw devices上，即使升級到這個版本中也不行。

原因：
In the past, clustered databases required raw devices. However raw devices were cumbersome to manage and are no longer required. 

Details of the Announcement

Starting with Oracle Database version 12.1 (release date TBD), support for storing data files, spfiles, controlfiles, online redo logfiles, OCRs and voting files on raw devices directly will end. This means commands such as the following will report an error while attempting to use raw devices directly in Oracle Database Version 12.1:

SQL> create tablespace ABC DATAFILE '/dev/raw/raw1' size 2GB;

 Note that while the direct use of raw devices will be de-supported for Oracle Database 12.1, customers can choose to create Oracle ASM diskgroups on top of raw devices. While it is recommended to store all shared files on ASM diskgroups, storing those files on NFS or certified cluster file systems remains supported.
--->看到這句話，雖然說認證通過的叢集檔案系統仍然受到支援，比如veritas storage foundation,但是誰能保證在未來的版本中還支援cluster file systems呢？veritas 看到這句話，一定有一種唇亡齒寒的感覺。

 The following SQL commands will not return an error while attempting to use raw devices. Reason: the raw devices in the example below are used indirectly via Oracel ASM (no direct use of raw devices here):

SQL>alter diskgroup MYDG add disk '/dev/raw/ABC1.dbf';ORSQL>create diskgroup MYDB EXTERNAL REDUNDANCY disk 'dev/raw/ABC1.dbf' Then use the following command to create the tablespaceSQL> create tablespace ABC DATAFILE '+MYDG' size 2GB;

Actions

If raw devices are not being used directly in the current release then no further actions need to be taken. However, if raw devices are being used directly currently, then planning should be performed to migrate respective files off raw devices. There are many choices currently to replace raw devices, including Oracle ASM, NFS, and supported cluster file systems.

 For more information on supported NFS or cluster file system,
 go to support.oracle.com -> Certifications

This announcement applies to both, Oracle Single Instance and Oracle Real Application Clusters (RAC) databases.

-->對單機和rac都不支援裸裝置了。