Linux下Oracle软件、数据文件等所在的磁盘分区空间不足的解决思路
虚拟机中的ORACLE运行的久了，归档、数据文件不断增长，原来安装ORACLE的分区空间不足。此时可以重新向虚拟机增加一块硬盘，将OR
虚拟机中的Oracle运行的久了，归档、数据文件不断增长，原来安装ORACLE的分区空间不足。
此时可以重新向虚拟机增加一块硬盘，将ORACLE的数据文件或归档的目录挂载到新增加的磁盘分区上。
--我这里未新增加磁盘，而是将原磁盘未划分分区的部分重新分区、格式化来挂载使用。--原理和新增加磁盘来分区并格式化再挂载是一样了。
--如果空间使用达到100%，ORACLE数据库正在运行会HANG住，，此时通过SQLPLUS登陆，也会有出错提示-具体提示未记录。如未启动，不能启动**。
一次因磁盘空间不足归档无法完成导致DML操作HANG住。
[root@oel-01 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda2 19G 13G 5.4G 71% /
/dev/sda1 99M 21M 74M 22% /boot
tmpfs 3.0G 528M 2.5G 18% /dev/shm
/dev/sda5 4.6G 3.2G 1.2G 73% /backup
计划重新挂载的就是这个目录：---仅为测试，具体根据实际需要来确定需要挂载到新分区的目录。
[root@oel-01 ~]# du -sh /home/oracle/rmanlog/
44K /home/oracle/rmanlog/
[root@oel-01 ~]# ls /home/oracle/rmanlog/
back01.log back11.log back13.log back22.log back24.log
back02_1.log back12.log back21.log back23.log rmanarch2013061815-40.log
############
--我这里因知道我的磁盘未使用完，直接就可以用fdisk来分区。如是新增加磁盘，可以使用 fdisk -l 来查看出新磁盘的名称。 --fdisk用法可以百度。
开始分区：--软件、系统提示为节约篇幅已经省略。
[root@oel-01 ~]# fdisk /dev/sda
Command (m for help): p
Disk /dev/sda: 32.2 GB, 32212254720 bytes
255 heads, 63 sectors/track, 3916 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sda1 * 1 13 104391 83 Linux
/dev/sda2 14 2563 20482875 83 Linux
/dev/sda3 2564 2824 2096482+ 82 Linux swap / Solaris
/dev/sda4 2825 3916 8771490 5 Extended
/dev/sda5 2825 3433 4891761 83 Linux
Command (m for help): n
First cylinder (3434-3916, default 3434):
Using default value 3434
Last cylinder or +size or +sizeM or +sizeK (3434-3916, default 3916): +100M ----测试用，所以只划分了100M。
Command (m for help): p --验证已经划分了新分区
Disk /dev/sda: 32.2 GB, 32212254720 bytes
255 heads, 63 sectors/track, 3916 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sda1 * 1 13 104391 83 Linux
/dev/sda2 14 2563 20482875 83 Linux
/dev/sda3 2564 2824 2096482+ 82 Linux swap / Solaris
/dev/sda4 2825 3916 8771490 5 Extended
/dev/sda5 2825 3433 4891761 83 Linux
/dev/sda6 3434 3446 104391 83 Linux
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
WARNING: Re-reading the partition table failed with error 16: Device or resource busy.
The kernel still uses the old table. ----重读分区表失败，用的扔是旧的分区表--直接格式时会出错找不到新分区。
The new table will be used at the next reboot.
Syncing disks.
##################
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