December 2, 2007
Linux RAC OCFS文件系统与INODES
作者:eygle
出处:http://blog.eygle.com
在ITPUB上看到这样一个案例，在一套Linux的RAC环境中，一个OCFS卷的inode节点已经用完，但是数据库仍然能够正常运行。文件可以正常创建，该系统的几本情况大致如下：
OS:LINUXAS3 U3以下为具体显示，/U04仅仅存放两节点产生的归档日志
ORACLE:ORACLE9204 RAC
[root@db1 /]# cat /etc/issue最后作者从Metalink上找到了解释，也就是说OCFS和通常的文件系统不同，inodes在这里并不发挥通常文件系统的作用。
Red Hat Enterprise Linux AS release 3 (Taroon Update 3)
[root@db1/]# rpm -qa |grep ocfs
ocfs-support-1.0.10-1
ocfs-tools-1.0.10-1
ocfs-2.4.21-EL-smp-1.0.13-1
[root@db1 /]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/emcpowerd1 50G 44M 50G 1% /u04
[root@db1 /]# df -i
Filesystem Inodes IUsed IFree IUse% Mounted on
/dev/emcpowerd1 409580 409231 349 100% /u04
这是OCFS的特性，是正常的。
引用一点解释记录如下：
@ OCFS does not have the concept of inodes, however, for the vfs layer in the
@ kernel we need to fill out structures. the number returned by df -i is
@ based on diskspace free. it's the number of clusterblocsk in the filesystem
@ we dont' preallocate inodes like most filesystems do. nor do we HAVE to do
@ that. not a bug, expected behaviour, not required to do what any other
@ filesystem does.
-The End-
Posted by eygle at 12:40 PM | Comments (0)