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今天在虚拟机环境下做实验，在将rac环境改动为flashback on时，报出了ORA-27054错误，错误代码例如以下：
Errors in file /u01/app/oracle/admin/racdb/udump/racdb2_ora_25551.trc:
ORA-38701: Flashback database log 2 seq 1 thread 2: "/u01/flashback/RACDB/flashback/o1_mf_%u_.flb"
ORA-27054: NFS file system where the file is created or resides is not mounted with correct options从错误描写叙述能够看出，闪回文件夹是通过nfs文件系统来实现的，而系统挂载nfs时，採用了错误的參数选项，导致oracle报错。上网查资料，通过文档359515.1顺利解决这个问题。
整理部分内容例如以下：
RAC
In the table below
- Binaries is the shared mount points where the Oracle Home and CRS_HOME is installed.
- Datafiles includes Online Logs, Controlfile and Datafiles
|
Operating System |
Mount options for Binaries | Mount options for Oracle Datafiles | Mount options for CRS Voting Disk and OCR |
| Sun Solaris * |
rw,bg,hard,nointr,rsize=32768, |
rw,bg,hard,nointr,rsize=32768, wsize=32768,proto=tcp,noac, forcedirectio, vers=3,suid |
rw,bg,hard,nointr,rsize=32768, wsize=32768,proto=tcp,vers=3, noac,forcedirectio |
| AIX (5L) ** |
rw,bg,hard,nointr,rsize=32768, |
cio,rw,bg,hard,nointr,rsize=32768, |
cio,rw,bg,hard,intr,rsize=32768, |
| HPUX 11.23 **** – | rw,bg,vers=3,proto=tcp,noac, hard,nointr,timeo=600, rsize=32768,wsize=32768,suid |
rw,bg,vers=3,proto=tcp,noac, forcedirectio,hard,nointr,timeo=600, rsize=32768,wsize=32768,suid |
rw,bg,vers=3,proto=tcp,noac, forcedirectio,hard,nointr,timeo=600 ,rsize=32768,wsize=32768,suid |
| Linux x86 # |
rw,bg,hard,nointr,rsize=32768, |
rw,bg,hard,nointr,rsize=32768, wsize=32768,tcp,actimeo=0, vers=3,timeo=600 |
rw,bg,hard,nointr,rsize=32768, |
| Linux x86-64 # | rw,bg,hard,nointr,rsize=32768, wsize=32768,tcp,vers=3, timeo=600, actimeo=0 |
rw,bg,hard,nointr,rsize=32768, wsize=32768,tcp,actimeo=0, vers=3,timeo=600 |
rw,bg,hard,nointr,rsize=32768, wsize=32768,tcp,vers=3, timeo=600,noac |
| Linux – Itanium | rw,bg,hard,nointr,rsize=32768, wsize=32768,tcp,vers=3, timeo=600, actimeo=0 |
rw,bg,hard,nointr,rsize=32768, wsize=32768,tcp,actimeo=0, vers=3,timeo=600 |
rw,bg,hard,nointr,rsize=32768, wsize=32768,tcp,noac,vers=3, timeo=600 |
* NFS mount option “forcedirectio” is required on Solaris platforms when mounting the OCR/CRS files when using Oracle 10.1.0.4 or 10.2.0.2 or later (Oracle unpublished bug 4466428)
** AIX is only supported with NAS on AIX 5.3 TL04 and higher with Oracle 10.2.0.1 and later (NetApp)
*** NAS devices are only supported with HPUX 11.23 or higher ONLY
# These mount options are for Linux kernels 2.6 and above for older kernels please check Note 279393.1
Due to Unpublished bug 5856342, it is necessary to use the following init.ora parameter when using NAS
with all versions of RAC on Linux (x86 & X86-64 platforms) until 10.2.0.4. This bug is fixed and included in 10.2.0.4 patchset.
filesystemio_options = DIRECTIO
Single Instance
|
Operating System |
Mount options for Binaries | Mount options for Oracle Datafiles |
| Sun Solaris * (8, 9, 10) |
rw,bg,hard,rsize=32768, |
rw,bg,hard,rsize=32768, wsize=32768,vers=3,[forcedirectio or llock], nointr,proto=tcp,suid |
| AIX (5L) ** |
rw,bg,hard,rsize=32768, |
rw,bg,hard,rsize=32768, |
| HPUX 11.23 **** | rw,bg,hard,rsize=32768, wsize=32768,vers=3,nointr, timeo=600,proto=tcp,suid |
rw,bg,hard,rsize=32768, wsize=32768,vers=3,nointr, timeo=600,proto=tcp,suid |
| Linux x86 # |
rw,bg,hard,rsize=32768, wsize=32768,vers=3,nointr, timeo=600,tcp |
rw,bg,hard,rsize=32768, wsize=32768,vers=3,nointr, timeo=600,tcp,actime=0* |
| Linux x86-64 # | rw,bg,hard,rsize=32768, wsize=32768,vers=3,nointr, timeo=600,tcp |
rw,bg,hard,rsize=32768, wsize=32768,vers=3,nointr, timeo=600,tcp,actime=0* |
| Linux – Itanium | rw,bg,hard,rsize=32768, wsize=32768,vers=3,nointr, timeo=600,tcp |
rw,bg,hard,rsize=32768, wsize=32768,vers=3,nointr, timeo=600,tcp |
* actime=0 or noac can be used
參照上文，改动mount參数例如以下：
[root@node2 bdump]# cat /etc/rc.d/rc.local
#!/bin/sh
#
# This script will be executed *after* all the other init scripts.
# You can put your own initialization stuff in here if you don't
# want to do the full Sys V style init stuff.touch /var/lock/subsys/localservice iscsi restart
#start_udevmodprobe hangcheck-timer
mount -t nfs -o rw,bg,noac,hard,nointr,rsize=32768,wsize=32768,nolock,proto=tcp,actimeo=0,vers=3,timeo=600 192.168.2.31:/u01/flashback/ /u01/flashback/问题成功解决！
另外，在网上查到资料，还能够使用例如以下方式解决
1：设置事件10298 level 32
alter system set event=’10298 trace name context forever,level 32′ scope=spfile;
又一次启动数据库后生效.
2：打补丁:5146667
我没有试验，有兴趣的朋友能够试试，
