2012-04-05

hadoop.nchc.org.tw

• 參考 2011-06-20 筆記
• <服務> 將 hadoop.nchc.org.tw 的 /home 容量加大
  • 這次比較不同的是採用 iSCSI 的硬碟
  • 測試環境：Debian GNU/Linux 6.0.4

    jazz@hadoop:~$ lsb_release -a
    No LSB modules are available.
    Distributor ID: Debian
    Description: Debian GNU/Linux 6.0.4 (squeeze)
    Release: 6.0.4
    Codename: squeeze
    

  • 測試步驟：
    • 安裝 open-iscsi

      jazz@hadoop:~$ sudo apt-get install open-iscsi
      

    • 修改 /etc/iscsi/iscsid.conf

      --- iscsid.conf.org 2012-04-05 17:04:06.000000000 +0800
      +++ iscsid.conf 2012-04-05 17:05:15.000000000 +0800
      @@ -25,10 +25,10 @@
      #*****************
      
      # To request that the iscsi initd scripts startup a session set to "automatic".
      -# node.startup = automatic
      +node.startup = automatic
      #
      # To manually startup the session set to "manual". The default is manual.
      -node.startup = manual
      +# node.startup = manual
      
      # *************
      # CHAP Settings
      @@ -36,12 +36,12 @@
      
      # To enable CHAP authentication set node.session.auth.authmethod
      # to CHAP. The default is None.
      -#node.session.auth.authmethod = CHAP
      +node.session.auth.authmethod = CHAP
      
      # To set a CHAP username and password for initiator
      # authentication by the target(s), uncomment the following lines:
      -#node.session.auth.username = username
      -#node.session.auth.password = password
      +node.session.auth.username = 登入帳號
      +node.session.auth.password = 登入密碼
      
      # To set a CHAP username and password for target(s)
      # authentication by the initiator, uncomment the following lines:
      @@ -50,12 +50,12 @@
      
      # To enable CHAP authentication for a discovery session to the target
      # set discovery.sendtargets.auth.authmethod to CHAP. The default is None.
      -#discovery.sendtargets.auth.authmethod = CHAP
      +discovery.sendtargets.auth.authmethod = CHAP
      
      # To set a discovery session CHAP username and password for the initiator
      # authentication by the target(s), uncomment the following lines:
      -#discovery.sendtargets.auth.username = username
      -#discovery.sendtargets.auth.password = password
      +discovery.sendtargets.auth.username = 登入帳號
      +discovery.sendtargets.auth.password = 登入密碼
      
      # To set a discovery session CHAP username and password for target(s)
      # authentication by the initiator, uncomment the following lines:
      

    • 啟動 iscsid

      jazz@hadoop:~$ sudo /etc/init.d/open-iscsi restart
      [sudo] password for jazz:
      Unmounting iscsi-backed filesystems: Unmounting all devices marked _netdev.
      Disconnecting iSCSI targets:.
      Stopping iSCSI initiator service:.
      Starting iSCSI initiator service: iscsid.
      Setting up iSCSI targets:
      iscsiadm: No records found!
      .
      Mounting network filesystems:.
      

    • 掃描 iSCSI 硬碟

      jazz@hadoop:~$ sudo iscsiadm -m discovery -t sendtargets -p X.X.X.X(iSCSI Target Server 的 IP)
      X.X.X.X:3260,0 iqn.2011-09.com.ems5:das-2000-i112a-fff000958:dev0
      

    • 使用 iSCSI 硬碟

      jazz@hadoop:~$ sudo iscsiadm -m node --targetname "iqn.2011-09.com.ems5:das-2000-i112a-fff000958:dev0" --login &
      

    • 查看 dmesg 會發現找到 iSCSI 硬碟在 /dev/sdX (這裡找到在 /dev/sdd)

      [2659438.350894] Loading iSCSI transport class v2.0-870.
      [2659438.359496] iscsi: registered transport (tcp)
      [2659438.382648] iscsi: registered transport (iser)
      [2659566.984113] scsi8 : iSCSI Initiator over TCP/IP
      [2659567.555637] scsi 8:0:0:0: Direct-Access     EMS5     DAS 2000-i112a   211  PQ: 0 ANSI: 4
      [2659567.556192] sd 8:0:0:0: [sdd] Very big device. Trying to use READ CAPACITY(16).
      [2659567.556792] sd 8:0:0:0: [sdd] 7811891200 512-byte logical blocks: (3.99 TB/3.63 TiB)
      [2659567.556937] sd 8:0:0:0: [sdd] Write Protect is off
      [2659567.556940] sd 8:0:0:0: [sdd] Mode Sense: bb 00 00 00
      [2659567.557250] sd 8:0:0:0: [sdd] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
      [2659567.557594] sd 8:0:0:0: [sdd] Very big device. Trying to use READ CAPACITY(16).
      [2659567.558192]  sdd: unknown partition table
      [2659567.577709] sd 8:0:0:0: [sdd] Very big device. Trying to use READ CAPACITY(16).
      [2659567.578310] sd 8:0:0:0: [sdd] Attached SCSI disk
      

    • 把 /dev/sdd 用 fdisk 先切割一個 partition /dev/sdd1

      jazz@hadoop:~$ sudo fdisk /dev/sdd
      

    • 開始著手把 /dev/sdd1 加入 LVM2

      jazz@hadoop:~$ sudo partprobe
      jazz@hadoop:~$ sudo pvcreate /dev/sdd1
        Physical volume "/dev/sdd1" successfully created