RHCS，GFS2，ISCSI，CLVM实现共享可扩展集群存储
一，GFS2简介GFS2是一个基于GFS的先进的集群文件系统，能够同步每台主机的集群文件系统的metadata，能够进行文件锁的管理，并且必须要redhat cluster suite支持，GFS2可以grow，进行容量的调整,不过这是在disk动态容量调整的支持下，也就是本文所要实现的CLVM。
实验环境：
192.168.30.119 tgtd.luojianlong.com OS:Centos 6.4 x86_64 管理服务器 iscsi-target-server
192.168.30.115 node1.luojianlong.com OS:Centos 6.4 x86_64 iscsi-initiator
192.168.30.116 node2.luojianlong.com OS:Centos 6.4 x86_64 iscsi-initiator
192.168.30.117 node3.luojianlong.com OS:Centos 6.4 x86_64 iscsi-initiator
原理：
node1,node2,node3分别通过ISCSI-initiator登录并挂载tgtd服务器的存储设备，利用RHCS搭建GFS2高可用集群文件系统，且保证3个节点对存储设备能够同时读写访问。
下面是拓扑图：
二，准备工作
分别设置4台服务器的hosts文件，以便能够解析对应节点，设置管理节点到各集群节点的ssh密钥无密码登录，关闭NetworkManager，设置开机不自动启动。# cat /etc/hosts
192.168.30.115 node1.luojianlong.com node1
192.168.30.116 node2.luojianlong.com node2
192.168.30.117 node3.luojianlong.com node3
# ssh-copy-id -i node1
The authenticity of host 'node1 (192.168.30.115)' can't be established.
RSA key fingerprint is 66:2e:28:75:ba:34:5e:b1:40:66:af:ba:37:80:20:3f.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'node1,192.168.30.115' (RSA) to the list of known hosts.
root@node1's password:
Now try logging into the machine, with "ssh 'node1'", and check in:
.ssh/authorized_keys
to make sure we haven't added extra keys that you weren't expecting.
# ssh-copy-id -i node2
The authenticity of host 'node2 (192.168.30.116)' can't be established.
RSA key fingerprint is 66:2e:28:75:ba:34:5e:b1:40:66:af:ba:37:80:20:3f.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'node2,192.168.30.116' (RSA) to the list of known hosts.
root@node2's password:
Now try logging into the machine, with "ssh 'node2'", and check in:
.ssh/authorized_keys
to make sure we haven't added extra keys that you weren't expecting.
# ssh-copy-id -i node3
The authenticity of host 'node3 (192.168.30.117)' can't be established.
RSA key fingerprint is 66:2e:28:75:ba:34:5e:b1:40:66:af:ba:37:80:20:3f.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'node3,192.168.30.117' (RSA) to the list of known hosts.
root@node3's password:
Now try logging into the machine, with "ssh 'node3'", and check in:
.ssh/authorized_keys
to make sure we haven't added extra keys that you weren't expecting.
# for I in {1..3}; do scp /etc/hosts node$I:/etc/; done
hosts 100% 129 0.1KB/s 00:00
hosts 100% 129 0.1KB/s 00:00
hosts# for I in {1..3}; do ssh node$I 'service NetworkManager stop'; done
Stopping NetworkManager daemon: [ OK ]
Stopping NetworkManager daemon: [ OK ]
Stopping NetworkManager daemon: [ OK ]
# for I in {1..3}; do ssh node$I 'chkconfig NetworkManager off'; done关闭各节点的iptables,selinux服务# for I in {1..3}; do ssh node$I 'service iptables stop'; done
# for I in {1..3}; do ssh node$I 'setenforce 0'; done集群安装
RHCS的核心组件为cman和rgmanager，其中cman为基于openais的“集群基础架构层”，rgmanager为资源管理器。RHCS的集群中资源的配置需要修改其主配置文件/etc/cluster/cluster.xml实现，其仅安装在集群中的某一节点上即可，而cman和rgmanager需要分别安装在集群中的每个节点上。这里选择将此三个rpm包分别安装在了集群中的每个节点上# for I in {1..3}; do ssh node$I 'yum -y install cman rgmanager'; done为集群创建配置文件
RHCS的配置文件/etc/cluster/cluster.conf，其在每个节点上都必须有一份，且内容均相同，其默认不存在，因此需要事先创建，ccs_tool命令可以完成此任务。另外，每个集群通过集群ID来标识自身，因此，在创建集群配置文件时需要为其选定一个集群名称，这里假设其为tcluster。此命令需要在集群中的某个节点上执行# for I in {1..3}; do ssh node$I 'ccs_tool create tcluster'; done查看生成的配置文件的内容
# cat cluster.conf<?xml version="1.0"?>
<cluster name="tcluster" config_version="1">
<clusternodes>
</clusternodes>
<fencedevices>
</fencedevices>
<rm>
<failoverdomains/>
<resources/>
</rm>
</cluster>#ccs_tool命令用于在线更新CCS的配置文件
为集群添加节点
RHCS集群需要配置好各节点及相关的fence设备后才能启动，因此，这里需要事先将各节点添加进集群配置文件。每个节点在添加进集群时，需要至少为其配置node id(每个节点的id必须惟一)，ccs_tool的addnode子命令可以完成节点添加。将前面规划的三个集群节点添加至集群中，可以使用如下命令实现。# ccs_tool addnode -n 1 node1.luojianlong.com
# ccs_tool addnode -n 2 node2.luojianlong.com
# ccs_tool addnode -n 3 node3.luojianlong.com查看已经添加完成的节点及相关信息：# ccs_tool lsnode
Cluster name: tcluster, config_version: 4
Nodename Votes Nodeid Fencetype
node1.luojianlong.com 1 1
node2.luojianlong.com 1 2
node3.luojianlong.com 1 3复制配置文件到其他2个节点# scp /etc/cluster/cluster.conf node2:/etc/cluster/
# scp /etc/cluster/cluster.conf node3:/etc/cluster/启动集群
RHCS集群会等待各节点都启动后方才进入正常工作状态，因此，需要把集群各节点上的cman服务同时启动起来。这分别需要在各节点上执行如下命令# for I in {1..3}; do ssh node$I 'service cman start'; done
Starting cluster:
Checking if cluster has been disabled at boot... [ OK ]
Checking Network Manager... [ OK ]
Global setup... [ OK ]
Loading kernel modules... [ OK ]
Mounting configfs... [ OK ]
Starting cman... [ OK ]
Waiting for quorum... [ OK ]
Starting fenced... [ OK ]
Starting dlm_controld... [ OK ]
Tuning DLM kernel config... [ OK ]
Starting gfs_controld... [ OK ]
Unfencing self... [ OK ]
Joining fence domain... [ OK ]
Starting cluster:
Checking if cluster has been disabled at boot... [ OK ]
Checking Network Manager... [ OK ]
Global setup... [ OK ]
Loading kernel modules... [ OK ]
Mounting configfs... [ OK ]
Starting cman... [ OK ]
Waiting for quorum... [ OK ]
Starting fenced... [ OK ]
Starting dlm_controld... [ OK ]
Tuning DLM kernel config... [ OK ]
Starting gfs_controld... [ OK ]
Unfencing self... [ OK ]
Joining fence domain... [ OK ]
Starting cluster:
Checking if cluster has been disabled at boot... [ OK ]
Checking Network Manager... [ OK ]
Global setup... [ OK ]
Loading kernel modules... [ OK ]
Mounting configfs... [ OK ]
Starting cman... [ OK ]
Waiting for quorum... [ OK ]
Starting fenced... [ OK ]
Starting dlm_controld... [ OK ]
Tuning DLM kernel config... [ OK ]
Starting gfs_controld... [ OK ]
Unfencing self... [ OK ]
Joining fence domain... [ OK ]# for I in {1..3}; do ssh node$I 'service rgmanager start'; done
Starting Cluster Service Manager: [ OK ]
Starting Cluster Service Manager: [ OK ]
Starting Cluster Service Manager: [ OK ]# for I in {1..3}; do ssh node$I 'chkconfig rgmanager on'; done
# for I in {1..3}; do ssh node$I 'chkconfig cman on'; done查看集群状态信息# clustat
Cluster Status for tcluster @ Tue Apr 1 16:45:23 2014
Member Status: Quorate
Member Name ID Status
------ ---- ---- ------
node1.luojianlong.com 1 Online, Local
node2.luojianlong.com 2 Online
node3.luojianlong.com 3 Onlinecman_tool的status子命令则以当前节点为视角来显示集群的相关信息# cman_tool status
Version: 6.2.0
Config Version: 4
Cluster Name: tcluster
Cluster Id: 10646
Cluster Member: Yes
Cluster Generation: 28
Membership state: Cluster-Member
Nodes: 3
Expected votes: 3
Total votes: 3
Node votes: 1
Quorum: 2
Active subsystems: 8
Flags:
Ports Bound: 0 177
Node name: node1.luojianlong.com
Node ID: 1
Multicast addresses: 239.192.41.191
Node addresses: 192.168.30.115cman_tool的nodes子命令则可以列出集群中每个节点的相关信息# cman_tool nodes
Node Sts Inc Joined Name
1 M 24 2014-04-01 16:37:57 node1.luojianlong.com
2 M 24 2014-04-01 16:37:57 node2.luojianlong.com
3 M 28 2014-04-01 16:38:11 node3.luojianlong.comcman_tool的services子命令则可以列出集群中每个服务的相关信息# cman_tool services
fence domain
member count 3
victim count 0
victim now 0
master nodeid 1
wait state none
members 1 2 3
dlm lockspaces
name rgmanager
id 0x5231f3eb
flags 0x00000000
change member 3 joined 1 remove 0 failed 0 seq 3,3
members 1 2 3在tgtd server上安装scsi-target-utils# yum -y install scsi-target-utils
# cp /etc/tgt/targets.conf /etc/tgt/targets.conf.bak编辑target配置文件，定义target# vi /etc/tgt/targets.conf# 添加如下内容<target iqn.2014-04.com.luojianlong:target1>
backing-store /dev/sdb
initiator-address 192.168.30.0/24
</target>
# service tgtd restartbacking-store：指定后端要共享的磁盘编号
initiator-address：授权客户端访问的网络地址
incominguser：设置登录用户的账号密码
启动target并查看# tgtadm -L iscsi -m target -o show
Target 1: iqn.2014-04.com.luojianlong:target1
System information:
Driver: iscsi
State: ready
I_T nexus information:
LUN information:
LUN: 0
Type: controller
SCSI ID: IET 00010000
SCSI SN: beaf10
Size: 0 MB, Block size: 1
Online: Yes
Removable media: No
Prevent removal: No
Readonly: No
Backing store type: null
Backing store path: None
Backing store flags:
LUN: 1
Type: disk
SCSI ID: IET 00010001
SCSI SN: beaf11
Size: 10737 MB, Block size: 512
Online: Yes
Removable media: No
Prevent removal: No
Readonly: No
Backing store type: rdwr
Backing store path: /dev/sdb
Backing store flags:
Account information:
ACL information:
192.168.30.0/24配置3个节点，使用iscsi-initiator登录tgtd服务的存储设备# for I in {1..3}; do ssh node$I 'iscsiadm -m discovery -t st -p 192.168.30.119'; done
192.168.30.119:3260,1 iqn.2014-04.com.luojianlong:target1
192.168.30.119:3260,1 iqn.2014-04.com.luojianlong:target1
192.168.30.119:3260,1 iqn.2014-04.com.luojianlong:target1
# for I in {1..3}; do ssh node$I 'iscsiadm -m node -T iqn.2014-04.com.luojianlong:target1 -p 192.168.30.119:3260 -l'; done
Logging in to (multiple)
Login to successful.
Logging in to (multiple)
Login to successful.
Logging in to (multiple)
Login to successful.
# for I in {1..3}; do ssh node$I 'fdisk -l /dev/sdb'; done
Disk /dev/sdb: 10.7 GB, 10737418240 bytes
64 heads, 32 sectors/track, 10240 cylinders
Units = cylinders of 2048 * 512 = 1048576 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Disk /dev/sdb: 10.7 GB, 10737418240 bytes
64 heads, 32 sectors/track, 10240 cylinders
Units = cylinders of 2048 * 512 = 1048576 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Disk /dev/sdb: 10.7 GB, 10737418240 bytes
64 heads, 32 sectors/track, 10240 cylinders
Units = cylinders of 2048 * 512 = 1048576 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000在其中一个节点上格式化一个分区# fdisk /dev/sdb
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel with disk identifier 0x7ac42a91.
Changes will remain in memory only, until you decide to write them.
After that, of course, the previous content won't be recoverable.
Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)
WARNING: DOS-compatible mode is deprecated. It's strongly recommended to
switch off the mode (command 'c') and change display units to
sectors (command 'u').
Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-10240, default 1):
Using default value 1
Last cylinder, +cylinders or +size{K,M,G} (1-10240, default 10240): +5G
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
# fdisk /dev/sdb
WARNING: DOS-compatible mode is deprecated. It's strongly recommended to
switch off the mode (command 'c') and change display units to
sectors (command 'u').
Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 2
First cylinder (5122-10240, default 5122):
Using default value 5122
Last cylinder, +cylinders or +size{K,M,G} (5122-10240, default 10240): +5G
Value out of range.
Last cylinder, +cylinders or +size{K,M,G} (5122-10240, default 10240): +4G
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
# fdisk -l /dev/sdb
Disk /dev/sdb: 10.7 GB, 10737418240 bytes
64 heads, 32 sectors/track, 10240 cylinders
Units = cylinders of 2048 * 512 = 1048576 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x7ac42a91
Device Boot Start End Blocks Id System
/dev/sdb1 1 5121 5243888 83 Linux
/dev/sdb2 5122 9218 4195328 83 Linux配置使用gfs2文件系统# for I in {1..3}; do ssh node$I 'yum -y install gfs2-utils'; done使用gfs2命令工具在之前创建好的/dev/sdb1上创建集群文件系统gfs2，可以使用如下命令# mkfs.gfs2 -j 3 -p lock_dlm -t tcluster:sdb1 /dev/sdb1
This will destroy any data on /dev/sdb1.
It appears to contain: Linux GFS2 Filesystem (blocksize 4096, lockproto lock_dlm)
Are you sure you want to proceed? y
Device: /dev/sdb1
Blocksize: 4096
Device Size 5.00 GB (1310972 blocks)
Filesystem Size: 5.00 GB (1310970 blocks)
Journals: 3
Resource Groups: 21
Locking Protocol: "lock_dlm"
Lock Table: "tcluster:sdb1"
UUID: 478dac97-c25f-5bc8-a719-0d385fea23e3mkfs.gfs2为gfs2文件系统创建工具，其一般常用的选项有：
-b BlockSize：指定文件系统块大小，最小为512，默认为4096；
-J MegaBytes：指定gfs2日志区域大小，默认为128MB，最小值为8MB；
-j Number：指定创建gfs2文件系统时所创建的日志区域个数，一般需要为每个挂载的客户端指定一个日志区域；
-p LockProtoName：所使用的锁协议名称，通常为lock_dlm或lock_nolock之一；
-t LockTableName：锁表名称，一般来说一个集群文件系统需一个锁表名以便让集群节点在施加文件锁时得悉其所关联到的集群文件系统，锁表名称为clustername:fsname，其中的clustername必须跟集群配置文件中的集群名称保持一致，因此，也仅有此集群内的节点可访问此集群文件系统；此外，同一个集群内，每个文件系统的名称必须惟一。
格式化完成后，重启node1,node2,node3,不然无法挂载刚才创建的GFS2分区# mount /dev/sdb1 /mnt/
# cp /etc/fstab /mnt/# 在node2,node3上面也同时挂载/dev/sdb1# mount /dev/sdb1 /mnt/
# mount /dev/sdb1 /mnt/# 在node1上挂载目录中写入数据，检测node2,node3的挂载目录数据情况# tail -f fstab
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
/dev/mapper/VolGroup-lv_root / ext4 defaults 1 1
UUID=db4bad23-32a8-44a6-bdee-1585ce9e13ac /boot ext4 defaults 1 2
/dev/mapper/VolGroup-lv_swap swap swap defaults 0 0
tmpfs /dev/shm tmpfs defaults 0 0
devpts /dev/pts devpts gid=5,mode=620 0 0
sysfs /sys sysfs defaults 0 0
proc /proc proc defaults 0 0
# tail -f fstab
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
/dev/mapper/VolGroup-lv_root / ext4 defaults 1 1
UUID=db4bad23-32a8-44a6-bdee-1585ce9e13ac /boot ext4 defaults 1 2
/dev/mapper/VolGroup-lv_swap swap swap defaults 0 0
tmpfs /dev/shm tmpfs defaults 0 0
devpts /dev/pts devpts gid=5,mode=620 0 0
sysfs /sys sysfs defaults 0 0
proc /proc proc defaults 0 0
# echo "hello" >> fstab
# tail -f fstab
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
/dev/mapper/VolGroup-lv_root / ext4 defaults 1 1
UUID=db4bad23-32a8-44a6-bdee-1585ce9e13ac /boot ext4 defaults 1 2
/dev/mapper/VolGroup-lv_swap swap swap defaults 0 0
tmpfs /dev/shm tmpfs defaults 0 0
devpts /dev/pts devpts gid=5,mode=620 0 0
sysfs /sys sysfs defaults 0 0
proc /proc proc defaults 0 0
hello
# tail -f fstab
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
/dev/mapper/VolGroup-lv_root / ext4 defaults 1 1
UUID=db4bad23-32a8-44a6-bdee-1585ce9e13ac /boot ext4 defaults 1 2
/dev/mapper/VolGroup-lv_swap swap swap defaults 0 0
tmpfs /dev/shm tmpfs defaults 0 0
devpts /dev/pts devpts gid=5,mode=620 0 0
sysfs /sys sysfs defaults 0 0
proc /proc proc defaults 0 0
hello以上信息发现，node2,node3已经发现数据发生变化。
三，配置使用CLVM(集群逻辑卷)
在RHCS集群节点上安装lvm2-cluster# for I in {1..3}; do ssh node$I 'yum -y install lvm2-cluster'; done在RHCS的各节点上，为lvm启用集群功能# for I in {1..3}; do ssh node$I 'lvmconf --enable-cluster'; done为RHCS各节点启动clvmd服务# for I in {1..3}; do ssh node$I 'service clvmd start'; done
Starting clvmd:
Activating VG(s): 2 logical volume(s) in volume group "VolGroup" now active
clvmd not running on node node3.luojianlong.com
clvmd not running on node node2.luojianlong.com
[ OK ]
Starting clvmd:
Activating VG(s): 2 logical volume(s) in volume group "VolGroup" now active
clvmd not running on node node3.luojianlong.com
[ OK ]
Starting clvmd:
Activating VG(s): 2 logical volume(s) in volume group "VolGroup" now active
[ OK ]创建物理卷、卷组和逻辑卷，使用管理单机逻辑卷的相关命令即可# pvcreate /dev/sdb2
Physical volume "/dev/sdb2" successfully created
# pvs
PV VG Fmt Attr PSize PFree
/dev/sda2 VolGroup lvm2 a-- 29.51g 0
/dev/sdb2 lvm2 a-- 4.00g 4.00g# 此时，在另外的其它节点上也能够看到刚刚创建的物理卷
创建卷组和逻辑卷# vgcreate clustervg /dev/sdb2
Clustered volume group "clustervg" successfully created
# lvcreate -L 2G -n clusterlv clustervg
Logical volume "clusterlv" created
# lvs
LV VG Attr LSize Pool Origin Data% Move Log Cpy%Sync Convert
lv_root VolGroup -wi-ao---- 25.63g
lv_swap VolGroup -wi-ao---- 3.88g
clusterlv clustervg -wi-a----- 2.00g在其他节点也能看到对应的逻辑卷# for I in {1..3}; do ssh node$I 'lvs'; done
LV VG Attr LSize Pool Origin Data% Move Log Cpy%Sync Convert
lv_root VolGroup -wi-ao---- 25.63g
lv_swap VolGroup -wi-ao---- 3.88g
clusterlv clustervg -wi-a----- 2.00g
LV VG Attr LSize Pool Origin Data% Move Log Cpy%Sync Convert
lv_root VolGroup -wi-ao---- 25.63g
lv_swap VolGroup -wi-ao---- 3.88g
clusterlv clustervg -wi-a----- 2.00g
LV VG Attr LSize Pool Origin Data% Move Log Cpy%Sync Convert
lv_root VolGroup -wi-ao---- 25.63g
lv_swap VolGroup -wi-ao---- 3.88g
clusterlv clustervg -wi-a----- 2.00g格式化逻辑卷# lvcreate -L 2G -n clusterlv clustervg
Logical volume "clusterlv" created
# lvs
LV VG Attr LSize Pool Origin Data% Move Log Cpy%Sync Convert
lv_root VolGroup -wi-ao---- 25.63g
lv_swap VolGroup -wi-ao---- 3.88g
clusterlv clustervg -wi-a----- 2.00g
# mkfs.gfs2 -p lock_dlm -j 2 -t tcluster:clusterlv /dev/clustervg/clusterlv
This will destroy any data on /dev/clustervg/clusterlv.
It appears to contain: symbolic link to `../dm-2'
Are you sure you want to proceed? y
Device: /dev/clustervg/clusterlv
Blocksize: 4096
Device Size 2.00 GB (524288 blocks)
Filesystem Size: 2.00 GB (524288 blocks)
Journals: 2
Resource Groups: 8
Locking Protocol: "lock_dlm"
Lock Table: "tcluster:clusterlv"
UUID: c8fbef88-970d-92c4-7b66-72499406fa9c挂载逻辑卷# mount /dev/clustervg/clusterlv /media/
# mount /dev/clustervg/clusterlv /media/
# mount /dev/clustervg/clusterlv /media/
Too many nodes mounting filesystem, no free journals# 发现node3挂载不了，因为刚才创建了2个journal，需要再添加一个# gfs2_jadd -j 1 /dev/clustervg/clusterlv
Filesystem: /media
Old Journals 2
New Journals 3# 然后挂载node3# mount /dev/clustervg/clusterlv /media/
# df -hT
Filesystem Type Size Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root
ext4 26G 6.1G 18G 26% /
tmpfs tmpfs 1.9G 38M 1.9G 2% /dev/shm
/dev/sda1 ext4 485M 65M 395M 15% /boot
/dev/sdb1 gfs2 5.1G 388M 4.7G 8% /mnt
/dev/mapper/clustervg-clusterlv
gfs2 2.0G 388M 1.7G 19% /media扩展逻辑卷# lvextend -L +2G /dev/clustervg/clusterlv
Extending logical volume clusterlv to 4.00 GiB
Logical volume clusterlv successfully resized
# gfs2_grow /dev/clustervg/clusterlv
FS: Mount Point: /media
FS: Device: /dev/dm-2
FS: Size: 524288 (0x80000)
FS: RG size: 65533 (0xfffd)
DEV: Size: 1048576 (0x100000)
The file system grew by 2048MB.
gfs2_grow complete.
# df -hT
Filesystem Type Size Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root
ext4 26G 6.1G 18G 26% /
tmpfs tmpfs 1.9G 38M 1.9G 2% /dev/shm
/dev/sda1 ext4 485M 65M 395M 15% /boot
/dev/sdb1 gfs2 5.1G 388M 4.7G 8% /mnt
/dev/mapper/clustervg-clusterlv
gfs2 4.0G 388M 3.7G 10% /media发现逻辑卷已经被扩展
到此，RHCS，GFS2，ISCSI，CLVM实现共享存储配置完毕。
竟然看完了，我擦
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