本文详细记录了DB2 purescale 10.5在VMware Workstation 上的安装过程，如果大家看了本人的博文后，实践过程中有什么问题，欢迎加本人微信84077708，我将尽我所能为大家解惑。
在上一篇博文Vmware Workstation + Suse Linux 11 SP3 + db2 purescale V10.5 (四)中，已经将操作系统上的绝大部分配置都已经做完了，本文继续进行余下的三个重要的配置，分别是：
1、iscsi服务器配置
2、iscsi客户端配置
3、ssh用户免密登陆配置
一、iscsi服务器配置（node01)
因为在前面创建虚拟机以及为虚拟机安装操作系统的过程中，已经说明了，将node01配置为iscsi服务器，将node01和node02配置为iscsi客户端。具体配置如下：
iscsi服务器端的配置文件为/etc/ietd.conf （node01虚拟机上)，在文件末尾加上以下内容：
Target iqn.2012-06.com.ibm:pureScaleDisk01
Lun 0 Path=/dev/sda3,Type=fileio,ScsiId=3456789012,ScsiSN=456789012
Target iqn.2012-06.com.ibm:pureScaleDisk02
Lun 1 Path=/dev/sda4,Type=fileio,ScsiId=1234567890,ScsiSN=345678901
上面配置中特别增加了ScsiId和ScsiSN两个参数，并且给了对应的数字，这是因为，每个ISCSI盘，都必须有对应的WWID号或WWN号码，DB2 purescale软件在安装的过程中会检查磁盘的WWID号或WWN号码，如果它找不到，就会报错，说磁盘无效。
二、iscsi客户端配置(node01 , node02)
配置文件为/etc/init.d/iscsiclient (该文件默认不存在，需要手动创建），文件内容如下：
#! /bin/sh
### BEGIN INIT INFO
# Provides: iscsiclsetup
# Required-Start: $network $syslog $remote_fs smartd
# Required-Stop:
# Default-Start: 3 5
# Default-Stop: 0 1 2 6
# Description: ISCSI client setup
### END INIT INFO
IPLIST="192.168.142.101"
# Shell functions sourced from /etc/rc.status:
# rc_check check and set local and overall rc status
# rc_status check and set local and overall rc status
# rc_status -v ditto but be verbose in local rc status
# rc_status -v -r ditto and clear the local rc status
# rc_failed set local and overall rc status to failed
# rc_reset clear local rc status (overall remains)
# rc_exit exit appropriate to overall rc status
. /etc/rc.status
# catch mis-use right here at the start
if [ "$1" != "start" -a "$1" != "stop" -a "$1" != "status" -a "$1" != "restart" -a "$1" != "rescan" -a "$1" != "mountall" ]; then
echo "Usage: $0 {start|stop|status|restart|rescan|mountall}"
exit 1
fi
# First reset status of this service
rc_reset
iscsimount() {
rc_reset
echo -n "Mounting $1: "
/usr/lpp/mmfs/bin/mmmount $1
rc_status -v
return $?
}
iscsiumount() {
rc_reset
echo -n "Umounting $1: "
/usr/lpp/mmfs/bin/mmumount $1
rc_status -v
return $?
}
iscsicheck() {
rc_reset
echo -n "Verify if $1 is mounted: "
mount | grep "on $1\b" > /dev/null
rc_status -v
return $?
}
iscsimountall() {
# Find all fstab lines with gpfs as fstype
for mountpoint in `grep "gpfs" /etc/fstab | awk '{print $2}'`
do
# Only try to mount filesystems that are not currently mounted
if ! mount | grep "on $mountpoint\b" > /dev/null
then
iscsimount $mountpoint || overallstatus=$?
fi
done
return $overallstatus
}
iscsiumountall() {
# Find all fstab lines with gpfs as fstype
for mountpoint in `grep "gpfs" /etc/fstab | awk '{print $2}'`
do
# Only try to umount filesystems that are currently mounted
if mount | grep "on $mountpoint\b" > /dev/null
then
iscsiumount $mountpoint || overallstatus=$?
fi
done
return $overallstatus
}
iscsicheckall() {
# Find all fstab lines with gpfs as fstype
for mountpoint in `grep "gpfs" /etc/fstab | awk '{print $2}'`
do
iscsicheck $mountpoint || overallstatus=$?
done
return $overallstatus
}
case "$1" in
start)
modprobe -q iscsi_tcp
iscsid
for IP in $IPLIST
do
ping -q $IP -c 1 -W 1 > /dev/null
RETURN_ON_PING=$?
if [ ${RETURN_ON_PING} == 0 ]; then
ISCSI_VALUES=`iscsiadm -m discovery -t st -p $IP \
| awk '{print $2}' | uniq`
if [ "${ISCSI_VALUES}" != "" ] ; then
for target in $ISCSI_VALUES
do
echo "Logging into $target on $IP"
iscsiadm --mode node --targetname $target \
--portal $IP:3260 --login
done
else
echo "No iscsitarget were discovered"
fi
else
echo "iscsitarget is not available"
fi
done
if [ ${RETURN_ON_PING} == 0 ]; then
if [ "${ISCSI_VALUES}" != "" ] ; then
/usr/lpp/mmfs/bin/mmstartup -a &> /dev/null
iscsimountall
fi
fi
;;
stop)
for IP in $IPLIST
do
ping -q $IP -c 1 -W 1 > /dev/null
RETURN_ON_PING=$?
if [ ${RETURN_ON_PING} == 0 ]; then
ISCSI_VALUES=`iscsiadm -m discovery -t st --portal $IP \
| awk '{print $2}' | uniq`
if [ "${ISCSI_VALUES}" != "" ] ; then
for target in $ISCSI_VALUES
do
echo "Logging out for $target from $IP"
iscsiadm -m node --targetname $target \
--portal $IP:3260 --logout
done
else
echo "No iscsitarget were discovered"
fi
fi
done
if [ ${RETURN_ON_PING} == 0 ]; then
if [ "${ISCSI_VALUES}" != "" ] ; then
iscsiumountall
fi
fi
;;
status)
echo "Running sessions"
iscsiadm -m session -P 1
iscsicheckall
rc_status -v
;;
rescan)
echo "Perform a SCSI rescan on a session"
iscsiadm -m session -r 1 --rescan
rc_status -v
;;
mountall)
iscsimountall
rc_status -v
;;
restart)
## Stop the service and regardless of whether it was
## running or not, start it again.
$0 stop
$0 start
;;
*)
echo "Usage: $0 {start|stop|status|restart|rescan|mountall}"
exit 1
esac
rc_status -r
rc_exit
到此，iscsi服务器和 iscsi客户端就配置完成了。接着执行以下命令，将iscsitarget服务和iscsiclient服务设置为开机自动启动。
node01:/etc/init.d # chkconfig -a iscsitarget
iscsitarget 0:off 1:off 2:off 3:on 4:off 5:on 6:off
node01:/etc/init.d # chkconfig -a iscsiclient
iscsiclient 0:off 1:off 2:off 3:on 4:off 5:on 6:off
node02:~ # chkconfig -a iscsiclient
iscsiclient 0:off 1:off 2:off 3:on 4:off 5:on 6:off
配置好以上内容后，就可以重启一下服务器，使node01和node02都能正常识别到我们配置的共享磁盘了
记住，由于node01是ISCSI服务器，所以在重启服务器时，必须先关闭node02，然后关闭node01，启动的时候，先启动node01 , 再启动node02.
重新启动服务器后，我们可以在node01和node02上看到多出了两块磁盘，如下：
node01服务器上的磁盘信息如下：
node01:~ # fdisk -l
Disk /dev/sda: 59.1 GB, 59055800320 bytes
255 heads, 63 sectors/track, 7179 cylinders, total 115343360 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: 0x000cf2bf
Device Boot Start End Blocks Id System
/dev/sda1 2048 8386559 4192256 82 Linux swap / Solaris
/dev/sda2 * 8386560 52420607 22017024 83 Linux
/dev/sda3 52420608 73383935 10481664 83 Linux
/dev/sda4 73383936 115343359 20979712 83 Linux
Disk /dev/sdb: 21.5 GB, 21483225088 bytes
64 heads, 32 sectors/track, 20488 cylinders, total 41959424 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: 0x00000000
Disk /dev/sdb doesn't contain a valid partition table
Disk /dev/sdc: 10.7 GB, 10733223936 bytes
64 heads, 32 sectors/track, 10236 cylinders, total 20963328 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: 0x00000000
Disk /dev/sdc doesn't contain a valid partition table
node02服务器上的磁盘信息如下：
node02:~ # fdisk -l
Disk /dev/sda: 26.8 GB, 26843545600 bytes
255 heads, 63 sectors/track, 3263 cylinders, total 52428800 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: 0x0004fe76
Device Boot Start End Blocks Id System
/dev/sda1 2048 8386559 4192256 82 Linux swap / Solaris
/dev/sda2 * 8386560 52428799 22021120 83 Linux
Disk /dev/sdb: 21.5 GB, 21483225088 bytes
64 heads, 32 sectors/track, 20488 cylinders, total 41959424 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: 0x00000000
Disk /dev/sdb doesn't contain a valid partition table
Disk /dev/sdc: 10.7 GB, 10733223936 bytes
64 heads, 32 sectors/track, 10236 cylinders, total 20963328 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: 0x00000000
Disk /dev/sdc doesn't contain a valid partition table
三、ssh用户免密登陆配置
root用户免密登陆：
node01:~ # ssh-keygen -t dsa
node01:~ # ssh-keygen -t rsa
node02:~ # ssh-keygen -t dsa
node02:~ # ssh-keygen -t rsa
node01:~ # cd .ssh
node01:~/.ssh # cat id_dsa.pub >> authorized_keys
node01:~/.ssh # cat id_rsa.pub >> authorized_keys
node01:~/.ssh # scp authorized_keys root@node02:~/.ssh/
node02:~ # cd .ssh
node02:~/.ssh # cat id_dsa.pub >> authorized_keys
node02:~/.ssh # cat id_rsa.pub >> authorized_keys
node02:~/.ssh # scp authorized_keys root@node01:~/.ssh/
node01:~ # ssh node01 date
node01:~ # ssh node02 date
node01:~ # ssh node01.purescale.ibm.local date
node01:~ # ssh node02.purescale.ibm.local date
node02:~ # ssh node01 date
node02:~ # ssh node02 date
node02:~ # ssh node01.purescale.ibm.local date
node02:~ # ssh node02.purescale.ibm.local date
db2sdin1用户免密登陆：
db2sdin1@node01:~> ssh-keygen -t dsa
db2sdin1@node01:~> ssh-keygen -t rsa
db2sdin1@node02:~> ssh-keygen -t dsa
db2sdin1@node02:~> ssh-keygen -t rsa
db2sdin1@node01:~> cd .ssh
db2sdin1@node01:~/.ssh> cat id_dsa.pub >> authorized_keys
db2sdin1@node01:~/.ssh> cat id_rsa.pub >> authorized_keys
db2sdin1@node01:~/.ssh> scp authorized_keys db2sdin1@node02:~/.ssh/
db2sdin1@node02:~> cd .ssh
db2sdin1@node02:~/.ssh> cat id_dsa.pub >> authorized_keys
db2sdin1@node02:~/.ssh> cat id_rsa.pub >> authorized_keys
db2sdin1@node02:~/.ssh> scp authorized_keys db2sdin1@node01:~/.ssh/
db2sdin1@node01:~> ssh node01 date
db2sdin1@node01:~> ssh node02 date
db2sdin1@node01:~> ssh node01.purescale.ibm.local date
db2sdin1@node01:~> ssh node02.purescale.ibm.local date
db2sdin1@node02:~> ssh node01 date
db2sdin1@node02:~> ssh node02 date
db2sdin1@node02:~> ssh node01.purescale.ibm.local date
db2sdin1@node02:~> ssh node02.purescale.ibm.local date
到此，Suse Linux 11SP3操作系统上的所有配置就基本配置完成了，但是此时还不能安装DB2 purescale，因为还有一些比较细致的东西在安装前需要进行配置，否则安装会失败。关于这些内容，请参阅《Vmware Workstation + Suse Linux 11 SP3 + db2 purescale V10.5 (六)》