aix的文件系统扩容是非常灵活的，如果不涉及加硬盘的硬件操作，只要通过aix里面的命令或者smitty菜单就行了，当然做好数据备份在任何情况下都是必要的。
1、因为数据库归档日志目录空间较小，而日志增长又比较快，因归档日志满很容易造成数据库挂起，所以准备对文件系统进行扩容。
# df -g
Filesystem GB blocks Free %Used Iused %Iused Mounted on
/dev/hd4 5.00 4.90 3% 7024 1% /
/dev/hd2 20.00 14.77 27% 57946 2% /usr
/dev/hd9var 10.00 9.37 7% 7454 1% /var
/dev/hd3 15.00 14.41 4% 3290 1% /tmp
/dev/hd1 6.00 5.01 17% 1873 1% /home
/proc - - - - - /proc
/dev/hd10opt 15.00 14.62 3% 10242 1% /opt
/dev/lv00 0.25 0.24 4% 18 1% /var/adm/csd
/dev/fslv00 10.00 9.20 8% 2876 1% /sapmnt/BWP
/dev/lv_oracle 0.50 0.50 1% 47 1% /oracle
/dev/BWP 5.00 4.55 9% 12334 2% /oracle/BWP
/dev/BWP_102_64 9.00 4.84 47% 22062 2% /oracle/BWP/102_64
/dev/BWP_mirrlogA 0.50 0.40 20% 6 1% /oracle/BWP/mirrlogA
/dev/BWP_mirrlogB 0.50 0.40 20% 6 1% /oracle/BWP/mirrlogB
/dev/BWP_oraarch 50.00 38.82 93% 279 1% /oracle/BWP/oraarch
/dev/BWP_origlogA 0.50 0.36 29% 9 1% /oracle/BWP/origlogA
2、查看当前活动的卷，只有两个，经与工程师确认数据库归档日志目录在ORAVG卷上。
# lsvg -o
oravg
rootvg
进一步详细查看ORAVG卷的信息
# lsvg -l oravg
oravg:
LV NAME TYPE LPs PPs PVs LV STATE MOUNT POINT
lv_oracle jfs2 2 2 1 open/syncd /oracle
client jfs2 2 2 1 open/syncd /oracle/client
stage_102_64 jfs2 28 28 1 open/syncd /oracle/stage/102_64
BWP jfs2 20 20 1 open/syncd /oracle/BWP
BWP_102_64 jfs2 36 36 1 open/syncd /oracle/BWP/102_64
BWP_origlogA jfs2 2 2 1 open/syncd /oracle/BWP/origlogA
BWP_origlogB jfs2 2 2 1 open/syncd /oracle/BWP/origlogB
BWP_mirrlogA jfs2 2 2 1 open/syncd /oracle/BWP/mirrlogA
BWP_mirrlogB jfs2 2 2 1 open/syncd /oracle/BWP/mirrlogB
BWP_oraarch jfs2 200 200 1 open/syncd /oracle/BWP/oraarch
发现当前目录的PPS大小为200
3、# lsvg oravg
VOLUME GROUP: oravg VG IDENTIFIER: 00c6abcf00004c000000012d038039cb
VG STATE: active PP SIZE: 256 megabyte(s)
VG PERMISSION: read/write TOTAL PPs: 7191 (1840896 megabytes)
MAX LVs: 512 FREE PPs: 2589 (582912 megabytes)
LVs: 18 USED PPs: 4602 (1257984 megabytes)
OPEN LVs: 18 QUORUM: 5 (Enabled)
TOTAL PVs: 9 VG DESCRIPTORS: 9
STALE PVs: 0 STALE PPs: 0
ACTIVE PVs: 9 AUTO ON: no
MAX PPs per VG: 130048
MAX PPs per PV: 1016 MAX PVs: 128
LTG size (Dynamic): 1024 kilobyte(s) AUTO SYNC: no
HOT SPARE: no BB POLICY: relocatable
查看oravg卷组信息可知每个PPS大小为256M，目前oravg还剩2589个PPS，共计662784M；
4、
扩展文件系统的空间
使用命令 # chfs -a size=+78G /oracle/BWP/oraarch #意思是给/oracle/BWP/oraarch增加78G的空间(注意G是大写)
执行完再lsvg 发现free pp size 没有增加，但是用smitty chfs 来做的时候
发现，增加的 size 在/oracle/BWP/oraarch上已经体现了。
使用smitty chfs来扩容的过程：
#smitty chfs回车后选择这一项Change/Show Characteristics of an Enhanced Journaled File System，然后在目录列表里找到需要扩容的目录按回车。
Type or select values in entry fields.
Press Enter AFTER making all desired changes.
[Entry Fields]
File system name /oracle/BWP/oraarch
NEW mount point [/oracle/BWP/oraarch]
SIZE of file system
Unit Size Megabytes +
Number of units [79872] #
Mount GROUP []
Mount AUTOMATICALLY at system restart? no +
PERMISSIONS read/write +
Mount OPTIONS [] +
Start Disk Accounting? no +
Block Size (bytes) 4096
Inline Log? no
Inline Log size (MBytes) [0] #
Extended Attribute Format [v1]
Enable Quota Management? no +
Allow Small Inode Extents? no +
we will see result:
COMMAND STATUS
Command: OK stdout: yes stderr: no
Before command completion, additional instructions may appear below.
Filesystem size changed to 131072 #扩容后包含已有空间的容量
5、再检查一下看新增上没有
# df -g
Filesystem GB blocks Free %Used Iused %Iused Mounted on
/dev/hd4 5.00 4.90 3% 7024 1% /
/dev/hd2 20.00 14.77 27% 57935 2% /usr
/dev/hd9var 10.00 9.37 7% 7454 1% /var
/dev/hd3 15.00 14.41 4% 3381 1% /tmp
/dev/hd1 6.00 5.01 17% 1873 1% /home
/proc - - - - - /proc
/dev/hd10opt 15.00 14.62 3% 10242 1% /opt
/dev/lv00 0.25 0.24 4% 18 1% /var/adm/csd
/dev/fslv00 10.00 9.20 8% 2876 1% /sapmnt/BWP
/dev/lv_oracle 0.50 0.50 1% 47 1% /oracle
/dev/BWP 5.00 4.55 10% 12348 2% /oracle/BWP
/dev/BWP_102_64 9.00 4.84 47% 22069 2% /oracle/BWP/102_64
/dev/BWP_mirrlogA 0.50 0.40 20% 6 1% /oracle/BWP/mirrlogA
/dev/BWP_mirrlogB 0.50 0.40 20% 6 1% /oracle/BWP/mirrlogB
/dev/BWP_oraarch 128.00 99.82 23% 663 1% /oracle/BWP/oraarch
好了，一切正常，扩容成功。