AIX卷組下文件系統怎么實現在線擴容

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 一臺AIX小機因生產需要對/sapdata目錄進行擴容，由原來的90G擴容到210G，增加120G的空間.AIX小機后端通過光纖交換機連的EMC存儲。首先在EMC存儲上把空閑的硬盤做RAID，劃分LUN，映射到生產AIX小機。

 EMC劃完LUN映射完后，在AIX小機上執行cfgmgr ，然后lspv看是否認到新擴容的硬盤.
# cfgmgr  -i  disk
# lspv
hdisk0          00c6abdfc094f4e8                    rootvg          active
hdisk1          00c6abcfc4edbd87                    rootvg          active
hdisk6                                                           oravg           active
hdisk7                                                           oravg           active

注意HDISK后的16位數字，如果沒有請執行
#chdev –l  hdisk6 –a  pv=yes (以使物理卷為LVM所用）。
#chdev –l  hdisk7 –a  pv=yes (以使物理卷為LVM所用）。

#lspv
hdisk0          00c6abdfc094f4e8                    rootvg          active
hdisk1          00c6abcfc4edbd87                    rootvg          active
hdisk6          00c6abcf1d17f7bf                     oravg           active
hdisk7          00c6abcf1d189c64                    oravg           active

(如果是HA架構，在A節點上識別到后執行#rmdev –Rd1 hdisk6然后在B節點上cfgmgr掃再認)--檢查兩節點LSPV是否一致和HDISK是否一致。

原文件目錄大小
#df -g
/dev/sapdata    90.00    84.80   94%       26     1% /oracle/sapdata

然后執行smitty hacmp--- System Management (C-SPOC)-- HACMP Logical Volume Management--- Shared Volume Groups-- Set Characteristics of a Shared Volume Group-- Add a Volume to a Shared Volume Group--選擇需要擴容的VG--回車，然后選擇添加的硬盤---確定。然后進行擴容文件系統。#smitty chfs—change/show charactertistics of an enhanced journaled file system—選擇要擴的文件系統—然后回車繼續.

如果文件系統擴容出錯，一般是文件系統的Block size或卷的LV原大小限制了最大擴容空間，可以# smitty hacmp--- System Management (C-SPOC)-- HACMP Logical Volume Management--- Shared file systems---enhanced journaled file systems---change/show characteristics of a shared enhanced journaled file system—選擇文件系統來修改塊大小，之后就可以成功擴文件系統。注：修改LV的大小，可以通過#smitty chlv來進行。

原參數:
Type or select values in entry fields.
Press Enter AFTER making all desired changes.
  
                                                    [Entry Fields]
  File system name                                    /oracle/sapdata
  NEW mount point                                    [/oracle/sapdata]
  SIZE of file system
          Unit Size                                      512bytes                               +
          Number of units                           [188743680]                         #
  Mount GROUP                                        []
  Mount AUTOMATICALLY at system restart?              no                +
  PERMISSIONS                                         read/write                       +
  Mount OPTIONS                                      []                                     +
  Start Disk Accounting?                              no                                     +
  Block Size (bytes)                                  256
  Inline Log?                                               no
  Inline Log size (MBytes)                           [0]                                     #
  Extended Attribute Format                          [v1]
  Enable Quota Management?                            no                               +
  Allow Small Inode Extents?                          no                                  +          

現參數:
Type or select values in entry fields.
Press Enter AFTER making all desired changes.
  
                                                    [Entry Fields]
  File system name                                    /oracle/sapdata
  NEW mount point                                    [/oracle/sapdata]
  SIZE of file system
          Unit Size                                   512bytes                             +
          Number of units                         [440401920]                      #
  Mount GROUP                                        []
  Mount AUTOMATICALLY at system restart?              no                        +
  PERMISSIONS                                         read/write                               +
  Mount OPTIONS                                      []                                            +
  Start Disk Accounting?                              no                                            +
  Block Size (bytes)                                  2048
  Inline Log?                                         no
  Inline Log size (MBytes)                           [0]                                          #
  Extended Attribute Format                          [v1]
  Enable Quota Management?                            no                                     +
  Allow Small Inode Extents?                        no                                +            

然后再擴，就正常了出現如下提示Filesystem size changed to 440401920  
注：擴容后包含已有空間的容量
驗證一下
#df -g
/dev/sapdata    210.00    84.80   40%       26     1% /oracle/sapdata

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