使用g_stat后指针发生了变化 实在不解

1. 查看磁盘状态
bash-3.00# vxdisk list

DEVICE TYPE DISK GROUP STATUS

c1t0d0s2 auto:none - - online invalid

c2t0d0s2 auto:cdsdisk c2t0d0 ocrvotedg online clone_disk shared

c2t1d0s2 auto:cdsdisk c2t1d0 orasysdg online clone_disk shared

c2t2d0s2 auto:cdsdisk c2t2d0 orasysdg online clone_disk shared

c2t3d0s2 auto:cdsdisk c2t3d0 ztdg online clone_disk shared

c2t4d0s2 auto:cdsdisk c2t4d0 oradatadg online clone_disk shared

c2t5d0s2 auto:cdsdisk c2t5d0 oradatadg online clone_disk shared

c2t6d0s2 auto:cdsdisk c2t6d0 oradatadg online clone_disk shared

c2t8d0s2 auto:cdsdisk c2t8d0 oradatadg online clone_disk shared

c2t9d0s2 auto:cdsdisk c2t9d0 oradatadg online clone_disk shared

c2t10d0s2 auto:cdsdisk c2t10d0 oradatadg online clone_disk shared

c3t0d0s2 auto:none - - online invalid

c3t1d0s2 auto:none - - online invalid

c3t2d0s2 auto:none - - online invalid

c3t3d0s2 auto:none - - online invalid

c3t4d0s2 auto:none - - online invalid

2. 初始化磁盘
bash-3.00# vxdisksetup -i c3t0d0

bash-3.00# vxdisksetup -i c3t2d0

bash-3.00# vxdisksetup -i c3t1d0

bash-3.00# vxdisk list

DEVICE TYPE DISK GROUP STATUS

c1t0d0s2 auto:none - - online invalid

c2t0d0s2 auto:cdsdisk c2t0d0 ocrvotedg online clone_disk shared

c2t1d0s2 auto:cdsdisk c2t1d0 orasysdg online clone_disk shared

c2t2d0s2 auto:cdsdisk c2t2d0 orasysdg online clone_disk shared

c2t3d0s2 auto:cdsdisk c2t3d0 ztdg online clone_disk shared

c2t4d0s2 auto:cdsdisk c2t4d0 oradatadg online clone_disk shared

c2t5d0s2 auto:cdsdisk c2t5d0 oradatadg online clone_disk shared

c2t6d0s2 auto:cdsdisk c2t6d0 oradatadg online clone_disk shared

c2t8d0s2 auto:cdsdisk c2t8d0 oradatadg online clone_disk shared

c2t9d0s2 auto:cdsdisk c2t9d0 oradatadg online clone_disk shared

c2t10d0s2 auto:cdsdisk c2t10d0 oradatadg online clone_disk shared

c3t0d0s2 auto:cdsdisk - - online

c3t1d0s2 auto:cdsdisk - - online

c3t2d0s2 auto:cdsdisk - - online

c3t3d0s2 auto:none - - online invalid

c3t4d0s2 auto:none - - online invalid

3. 看一下现有的磁盘组以及文件系统状态
bash-3.00# vxdg list

NAME STATE ID

ocrvotedg enabled,shared,cds 1334545530.14.sol1

oradatadg enabled,shared,cds 1334546231.20.sol1

orasysdg enabled,shared,cds 1334546065.16.sol1

ztdg enabled,shared,cds 1334546157.18.sol1

看一下磁盘组（oradatadg一共占用大概15gb，13gb分配给了各个卷集）

bash-3.00# vxprint -g oradatadg -uG

TY NAME ASSOC KSTATE LENGTH PLOFFS STATE TUTIL0 PUTIL0

dg oradatadg oradatadg - - - - - -

dm c2t4d0 c2t4d0s2 - 9.96g - - - -

dm c2t5d0 c2t5d0s2 - 0.96g - - - -

dm c2t6d0 c2t6d0s2 - 0.96g - - - -

dm c2t8d0 c2t8d0s2 - 0.96g - - - -

dm c2t9d0 c2t9d0s2 - 0.96g - - - -

dm c2t10d0 c2t10d0s2 - 0.96g - - - -

vt rs_vset - ENABLED - - ACTIVE - -

v ydata_3 rs_vset ENABLED 3.00g - ACTIVE - -

pl ydata_3-01 ydata_3 ENABLED 3.00g - ACTIVE - -

sd c2t4d0-03 ydata_3-01 ENABLED 1.96g 0.00 - - -

sd c2t5d0-01 ydata_3-01 ENABLED 0.96g 1.96g - - -

sd c2t6d0-01 ydata_3-01 ENABLED 0.06g 2.93g - - -

v ydata_4 rs_vset ENABLED 2.00g - ACTIVE - -

pl ydata_4-01 ydata_4 ENABLED 2.00g - ACTIVE - -

sd c2t8d0-01 ydata_4-01 ENABLED 0.96g 0.00 - - -

sd c2t9d0-01 ydata_4-01 ENABLED 0.96g 0.96g - - -

sd c2t10d0-01 ydata_4-01 ENABLED 0.06g 1.93g - - -

vt vect_vset - ENABLED - - ACTIVE - -

v ydata_1 vect_vset ENABLED 4.00g - ACTIVE - -

pl ydata_1-01 ydata_1 ENABLED 4.00g - ACTIVE - -

sd c2t4d0-01 ydata_1-01 ENABLED 4.00g 0.00 - - -

v ydata_2 vect_vset ENABLED 4.00g - ACTIVE - -

pl ydata_2-01 ydata_2 ENABLED 4.00g - ACTIVE - -

sd c2t4d0-02 ydata_2-01 ENABLED 4.00g 0.00 - - -

bash-3.00# vxprint -g oradatadg -v -ug

TY NAME ASSOC KSTATE LENGTH PLOFFS STATE TUTIL0 PUTIL0

v ydata_1 vect_vset ENABLED 4.00g - ACTIVE - -

v ydata_2 vect_vset ENABLED 4.00g - ACTIVE - -

v ydata_3 rs_vset ENABLED 3.00g - ACTIVE - -

v ydata_4 rs_vset ENABLED 2.00g - ACTIVE - -

bash-3.00# vxdg -g oradatadg free

DISK DEVICE TAG OFFSET LENGTH FLAGS

c2t6d0 c2t6d0s2 c2t6d0 132464 1898768 -

c2t10d0 c2t10d0s2 c2t10d0 131840 1899392 -
数字大概能对上（除以2是因为这里的length是使用512字节为一个unit）

bash-3.00# vxdg -g oradatadg free | grep -v OFFSET | awk -F" " '{print ($5-$4)/1024/1024/2}'

0.842239

0.842834

4. 我们向oradatadg中加入磁盘
bash-3.00# vxdg -g oradatadg adddisk c3t0d0

bash-3.00# vxdg -g oradatadg adddisk c3t1d0

bash-3.00# vxdg -g oradatadg adddisk c3t2d0

5. 拓展文件系统

先看一下文件系统
bash-3.00# cfscluster status

Node : sol1

Cluster Manager : running

CVM state : running

MOUNT POINT SHARED VOLUME DISK GROUP STATUS

/ysysdata ysys_vset orasysdg MOUNTED

/gwvec vect_vset oradatadg MOUNTED

/gwrs rs_vset oradatadg MOUNTED

/ocrvote ocrvotevol ocrvotedg MOUNTED

/ztapp ztvol_1 ztdg MOUNTED

/oralog redovol orasysdg MOUNTED

Node : sol2

Cluster Manager : running

CVM state : running

MOUNT POINT SHARED VOLUME DISK GROUP STATUS

/ysysdata ysys_vset orasysdg MOUNTED

/gwvec vect_vset oradatadg MOUNTED

/gwrs rs_vset oradatadg MOUNTED

/ocrvote ocrvotevol ocrvotedg MOUNTED

/ztapp ztvol_1 ztdg MOUNTED

/oralog redovol orasysdg MOUNTED

我们来拓展一下/gwrs这个文件系统

bash-3.00# df -h | grep gwrs
/dev/vx/dsk/oradatadg/rs_vset 5.0G 320M 4.4G 7% /gwrs

现在一共占用了5g

bash-3.00# vxprint -g oradatadg -v -ug

TY NAME ASSOC KSTATE LENGTH PLOFFS STATE TUTIL0 PUTIL0

v ydata_1 vect_vset ENABLED 4.00g - ACTIVE - -

v ydata_2 vect_vset ENABLED 4.00g - ACTIVE - -

v ydata_3 rs_vset ENABLED 3.00g - ACTIVE - -

v ydata_4 rs_vset ENABLED 2.00g - ACTIVE - -
bash-3.00# vxdg -g oradatadg free | grep -v OFFSET | awk -F" " '{a+=($5-$4)} END {print a/1024/1024/2"g"}'

4.59077g
一共还有大概4.6g的空余空间

以上我们可以看到，使用的是卷集来挂载集群文件系统。所以这个时候拓展文件系统的容量一共有两种方法。下面分别来介绍。

5.1 直接拓展卷集中的卷的容量

我们向ydata_3这个卷中增加500m的容量
bash-3.00# vxresize -g oradatadg ydata_3 +500m

bash-3.00# df -h | grep gwrs

/dev/vx/dsk/oradatadg/rs_vset 5.5G 320M 4.9G 7% /gwrs
简单吧，可以看到不需要其他命令，已经对文件系统生效了。

5.2 新增卷到卷集中
现在试一下第二种方法

新增一个卷

bash-3.00# vxassist -g oradatadg make ydata_5 500m

加入到卷集中

bash-3.00# vxvset -g oradatadg addvol rs_vset ydata_5

没有变化？

bash-3.00# df -h | grep gwrs

/dev/vx/dsk/oradatadg/rs_vset 5.5G 320M 4.9G 7% /gwrs

如果指定的大小大于卷的大小会报错

bash-3.00# fsvoladm add /gwrs ydata_5 600m

UX:vxfs fsvoladm: ERROR: V-3-25572: volume add failed on /gwrs, No such device or address (6)

bash-3.00# fsvoladm add /gwrs ydata_5 500m

ok 结束

bash-3.00# df -h | grep gwrs
/dev/vx/dsk/oradatadg/rs_vset 6.0G 320M 5.3G 6% /gwrs

标红的都是关键性语句