[[Cent OS]]

* CentOSにハードディスク増設 [#q76e7489]

最近は、2TBや3TBのハードディスクが安くなってきているので、増設を行う。


** gdiskの準備 [#f91346cf]

2TB以上のハードディスクの領域を扱うには、fdiskよりgdiskの方が
便利。

そのため、yumでインストールするが、epelリポジトリがつかえるようにする登録が必要。

下記ホームページにある、

http://ftp.riken.jp/Linux/fedora/epel/6/i386/repoview/epel-release.html

- epel-release-6-8.noarch.rpm をインストールする。

(このページにも添付しておきます。)

 rpm -ivh /home/fujio/epel-release-6-8.noarch.rpm

- 次にgdiskをyumでインストール

 yum install gdisk


- 2番目のSTATディスクなら、/dev/sdbなので(注意!!!!!!!)

 gdisk /dev/sdbとする


-- まず、パーティションを

 # gdisk /dev/sdb
GPT fdisk (gdisk) version 0.8.4

Partition table scan:
  MBR: MBR only
  BSD: not present
  APM: not present
  GPT: not present


*************************************************************** [#y6dd84b2]
Found invalid GPT and valid MBR; converting MBR to GPT format.
THIS OPERATION IS POTENTIALLY DESTRUCTIVE! Exit by typing 'q' if
you don't want to convert your MBR partitions to GPT format!
*************************************************************** [#b579f933]


Command (? for help): n
Partition number (1-128, default 1):
First sector (34-3907029134, default = 2048) or {+-}size{KMGTP}:
Last sector (2048-3907029134, default = 3907029134) or {+-}size{KMGTP}:
Current type is 'Linux filesystem'
Hex code or GUID (L to show codes, Enter = 8300):
Changed type of partition to 'Linux filesystem'

Command (? for help): w

Final checks complete. About to write GPT data. THIS WILL OVERWRITE EXISTING
PARTITIONS!!

Do you want to proceed? (Y/N): Y
OK; writing new GUID partition table (GPT) to /dev/sdb.
The operation has completed successfully.


 gdisk /dev/sdb
 GPT fdisk (gdisk) version 0.8.4 
 
 Partition table scan:
   MBR: protective
   BSD: not present
   APM: not present
   GPT: present 
 
 Found valid GPT with protective MBR; using GPT.
 
 Command (? for help): p
 Disk /dev/sdb: 3907029168 sectors, 1.8 TiB
 Logical sector size: 512 bytes
 Disk identifier (GUID): A44F6289-32B2-4EDA-9D0E-BF4228EBE4A6
 Partition table holds up to 128 entries
 First usable sector is 34, last usable sector is 3907029134
 Partitions will be aligned on 2048-sector boundaries
 Total free space is 2014 sectors (1007.0 KiB) 
 
 Number  Start (sector)    End (sector)  Size       Code  Name
    1            2048      3907029134   1.8 TiB     8300  Linux filesystem 
 
 Command (? for help): q


- File Systemを作る


-- ext3の場合

 mkfs -t ext3 /dev/sdb1
 
 mke2fs 1.41.12 (17-May-2010)
 Filesystem label=
 OS type: Linux
 Block size=4096 (log=2)
 Fragment size=4096 (log=2)
 Stride=1 blocks, Stripe width=0 blocks
 122101760 inodes, 488378385 blocks
 24418919 blocks (5.00%) reserved for the super user
 First data block=0
 Maximum filesystem blocks=4294967296
 14905 block groups
 32768 blocks per group, 32768 fragments per group
 8192 inodes per group
 Superblock backups stored on blocks:  
	32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208, 
	4096000, 7962624, 11239424, 20480000, 23887872, 71663616, 78675968, 
	102400000, 214990848
 
 Writing inode tables: done                            
 Creating journal (32768 blocks): done
 Writing superblocks and filesystem accounting information: done  
 
 This filesystem will be automatically checked every 38 mounts or
 180 days, whichever comes first.  Use tune2fs -c or -i to override.

--- ext3の場合のdf

 /dev/sdb1            1922859892    200160 1824984056   1% /app


-- ext4の場合(だいぶ初期化に時間がかかる)
 mkfs -t ext4 /dev/sdb1
 mke2fs 1.41.12 (17-May-2010)
 Filesystem label=
 OS type: Linux
 Block size=4096 (log=2)
 Fragment size=4096 (log=2)
 Stride=1 blocks, Stripe width=0 blocks
 122101760 inodes, 488378385 blocks
 24418919 blocks (5.00%) reserved for the super user
 First data block=0
 Maximum filesystem blocks=4294967296
 14905 block groups
 32768 blocks per group, 32768 fragments per group
 8192 inodes per group
 Superblock backups stored on blocks: 
	32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208, 
	4096000, 7962624, 11239424, 20480000, 23887872, 71663616, 78675968, 
	102400000, 214990848




 Writing inode tables: done                            
 Creating journal (32768 blocks): done
 Writing superblocks and filesystem accounting information: done
 
 
 
 
 This filesystem will be automatically checked every 36 mounts or
 180 days, whichever comes first.  Use tune2fs -c or -i to override.

--- ext4 の場合

 /dev/sdb1            1922859892    200028 1824984188   1% /app

- マウントする

 mount /dev/sdb1 /app


- Auto Mountするように、設定する

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