= 2012-04-05 =

== hadoop.nchc.org.tw ==

 * 參考 [wiki:jazz/11-06-20  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
{{{
#!diff
--- 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
jazz@hadoop:~$ sudo fdisk -ul /dev/sdd

Disk /dev/sdd: 3999.7 GB, 3999688294400 bytes
255 heads, 63 sectors/track, 486267 cylinders, total 7811891200 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xc99c92c5

   Device Boot      Start         End      Blocks   Id  System
/dev/sdd1              63  4294961684  2147480811   83  Linux
}}}
   * 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
}}}