HPUX v11.11 在线去掉坏的Mirror根盘测试
前两天客户有台根盘做了Mirror的RP7410启不来了，幸好有MC/SG双机环境。两块内置硬盘在另一台RP7410上做diskinfo都没返回信息，估计可能是两块
盘都出现故障了。后来停掉业务停机，在拔出另一台RP7410双机做了Mirror
的内置硬盘，插在故障机器上通过取消根盘Mirror，以及用新硬盘重做根盘
Mirror等操作才得以恢复。
由于整个故障排除不在现场，现根据这样的情况在自已的HP9000 C3000机器
上做个完整的HPUX v11.11根盘Mirror及去掉一块硬盘后取消根盘Mirror的测试：
测试环境：
主机 HP9000 C3000
OS HP_UX v11.11
内置硬盘18.2GB*2
安装HP_UX v11.11操作系统及补丁这里略过，将HP_UX 11i的Application
Software四张安装CD的第一张放入光驱，
#mkdir /cdrom
#ioscan -fnC disk
Class IH/W Path Driver S/W State H/W Type Description
=======================================================================
disk 010/0/14/0.0.0sdisk CLAIMED DEVICE TEAC CD-532E-B
/dev/dsk/c0t0d0 /dev/rdsk/c0t0d0
disk 110/0/15/1.5.0sdisk CLAIMED DEVICE COMPAQBD0186349B
/dev/dsk/c3t5d0 /dev/rdsk/c3t5d0
disk 210/0/15/1.6.0sdisk CLAIMED DEVICE COMPAQBD0186349B
/dev/dsk/c3t6d0 /dev/rdsk/c3t6d0
#mount /dev/dsk/c0t0d0 /cdrom
#swinstall -s /cdrom
在列表里找到B5403BA B.11.11 MirrorDisk/UX并执行安装，缺省安装这个软
件会重新编译内核，安装完成后系统自动重新启动。启动完成后就开始做根盘的Mirror
由于系统是安装在c3t5d0上，另一块盘c3t6d0做镜像盘。
#pvcreate -fB /dev/rdsk/c3t6d0
#vgextend /dev/vg00 /dev/dsk/c3t6d0
#vgdisplay -v vg00
确认根盘的8个LV，并且c3t6d0已经加入到vg00中了。
#mkboot -l /dev/dsk/c3t6d0
#lifls -l /dev/rdsk/c3t5d0
#lifls -l /dev/rdsk/c3t6d0
在c3t6d0上创建LIF，并对比两块硬盘的LIF信息一致性。
#for i in 1 2 3 4 5 6 7 8
>do
>lvextend -m 1 /dev/vg00/lvol$i /dev/dsk/c3t6d0
>done
The newly allocated mirrors are now being synchronized. This operation will
take some time. Please wait ....
Logical volume "/dev/vg00/lvol1" has been successfully extended.
Volume Group configuration for /dev/vg00 has been saved in /etc/lvmconf/vg00.conf
The newly allocated mirrors are now being synchronized. This operation will
take some time. Please wait ....
Logical volume "/dev/vg00/lvol2" has been successfully extended.
Volume Group configuration for /dev/vg00 has been saved in /etc/lvmconf/vg00.conf
The newly allocated mirrors are now being synchronized. This operation will
take some time. Please wait ....
Logical volume "/dev/vg00/lvol3" has been successfully extended.
Volume Group configuration for /dev/vg00 has been saved in /etc/lvmconf/vg00.conf
The newly allocated mirrors are now being synchronized. This operation will
take some time. Please wait ....
Logical volume "/dev/vg00/lvol4" has been successfully extended.
Volume Group configuration for /dev/vg00 has been saved in /etc/lvmconf/vg00.conf
The newly allocated mirrors are now being synchronized. This operation will
take some time. Please wait ....
Logical volume "/dev/vg00/lvol5" has been successfully extended.
Volume Group configuration for /dev/vg00 has been saved in /etc/lvmconf/vg00.conf
The newly allocated mirrors are now being synchronized. This operation will
take some time. Please wait ....
Logical volume "/dev/vg00/lvol6" has been successfully extended.
Volume Group configuration for /dev/vg00 has been saved in /etc/lvmconf/vg00.conf
The newly allocated mirrors are now being synchronized. This operation will
take some time. Please wait ....
Logical volume "/dev/vg00/lvol7" has been successfully extended.
Volume Group configuration for /dev/vg00 has been saved in /etc/lvmconf/vg00.conf
The newly allocated mirrors are now being synchronized. This operation will
take some time. Please wait ....
Logical volume "/dev/vg00/lvol8" has been successfully extended.
Volume Group configuration for /dev/vg00 has been saved in /etc/lvmconf/vg00.conf
#mkboot -a "hpux -lq(;0)/stand/vmunix" /dev/rdsk/c3t6d0
#lvlnboot -b /dev/vg00/lvol1
#lvlnboot -s /dev/vg00/lvol2
#lvlnboot -r /dev/vg00/lvol3
#lvlnboot -d /dev/vg00/lvol2
#setboot -p 10/0/15/1.6.0
#setboot -a 10/0/15/1.5.0
至此根盘的Mirror工作完成，经过多次重新启动，多次更改setboot引导顺序后确认
Mirror没有问题。
接下来关机下电，拔掉c3t6d0这块硬盘，启动机器可看到报错信息，仍能够启动系统。
登录后vgdisplay也显示报错信息
# vgdisplay
vgdisplay: Warning: couldn't query physical volume "/dev/dsk/c3t6d0":
The specified path does not correspond to physical volume attached to
this volume group
vgdisplay: Warning: couldn't query all of the physical volumes.
--- Volume groups ---
VG Name /dev/vg00
VG Write Access read/write
VG Status available
Max LV 255
Cur LV 8
Open LV 8
Max PV 16
Cur PV 2
Act PV 1
Max PE per PV 4350
VGDA 2
PE Size (Mbytes) 4
Total PE 4340
Alloc PE 3124
Free PE 1216
Total PVG 0
Total Spare PVs 0
Total Spare PVs in use 0
由于已经不存在c3t6d0硬盘或是这块硬盘已经故障不再有数据信息，这里就不能再使
用lvreduce -m 0 /dev/vg00/lvol1 /dev/dsk/c3t6d0等命令来取消c3t6d0上的Mirror信息
了，这里HP提供一个pv_key方试来取消Mirror，具体每个LV的信息里包括了pv_key，可以
通过下面命令查看
# lvdisplay -kv /dev/vg00/lvol1
lvdisplay: Warning: couldn't query physical volume "/dev/dsk/c3t6d0":
The specified path does not correspond to physical volume attached to
this volume group
lvdisplay: Warning: couldn't query all of the physical volumes.
--- Logical volumes ---
LV Name /dev/vg00/lvol1
VG Name /dev/vg00
LV Permission read/write
LV Status available/stale
Mirror copies 1
Consistency Recovery MWC
Schedule parallel
LV Size (Mbytes) 300
Current LE 75
Allocated PE 150
Stripes 0
Stripe Size (Kbytes) 0
Bad block off
Allocation strict/contiguous
IO Timeout (Seconds) default
--- Distribution of logical volume ---
PV Name LE on PVPE on PV
/dev/dsk/c3t5d0 75 75
--- Logical extents ---
LE PV1 PE1 Status 1 PV2 PE2 Status 2
00000 0 00000 stale 1 00000 current
00001 0 00001 stale 1 00001 current
00002 0 00002 stale 1 00002 current
00003 0 00003 stale 1 00003 current
...... ......
可以看到PV1的pv_key=0 而其PV的状态已经stale了，那么我们需要去掉这个PV在
VG00中的信息。下面这个命令增加了一个-k参数，最后一个0表示PV1的pv_key,用它代替了
c3t6d0这块硬盘。
# lvreduce -k -m 0 /dev/vg00/lvol1 0
Logical volume "/dev/vg00/lvol1" has been successfully reduced.
lvlnboot: Warning: couldn't query physical volume "/dev/dsk/c3t6d0":
The specified path does not correspond to physical volume attached to
this volume group
lvlnboot: Warning: couldn't query all of the physical volumes.
vgcfgbackup: Warning: couldn't query physical volume "/dev/dsk/c3t6d0":
The specified path does not correspond to physical volume attached to
this volume group
vgcfgbackup: Warning: couldn't query all of the physical volumes.
vgcfgbackup: Couldn't query physical volume "/dev/dsk/c3t6d0":
The specified path does not correspond to physical volume attached to
this volume group
vgcfgbackup: Couldn't query physical volume "/dev/dsk/c3t6d0":
The specified path does not correspond to physical volume attached to
this volume group
将lvol1清理完成后再用lvdisplay看到如下正常信息。
# lvdisplay -kv /dev/vg00/lvol1|more
lvdisplay: Warning: couldn't query physical volume "/dev/dsk/c3t6d0":
The specified path does not correspond to physical volume attached to
this volume group
lvdisplay: Warning: couldn't query all of the physical volumes.
--- Logical volumes ---
LV Name /dev/vg00/lvol1
VG Name /dev/vg00
LV Permission read/write
LV Status available/syncd
Mirror copies 0
Consistency Recovery MWC
Schedule parallel
LV Size (Mbytes) 300
Current LE 75
Allocated PE 75
Stripes 0
Stripe Size (Kbytes) 0
Bad block off
Allocation strict/contiguous
IO Timeout (Seconds) default
--- Distribution of logical volume ---
PV Name LE on PVPE on PV
/dev/dsk/c3t5d0 75 75
--- Logical extents ---
LE PV1 PE1 Status 1
00000 1 00000 current
00001 1 00001 current
00002 1 00002 current
00003 1 00003 current
...... ......
这里仍有报错信息，这是由于c3t6d0仍在vg00这个卷组中有信息，后面再处理，现在先
在剩下的7个LV中用上面的pv_key的方法一一去掉c3t6d0的信息。完成后现在要将c3t6d0在vg00
里的信息删掉，即从vg00中用vgreduce命令删掉c3t6d0这个PV。
# vgreduce -f vg00
vgreduce: Couldn't query physical volume "/dev/dsk/c3t6d0":
The specified path does not correspond to physical volume attached to
this volume group
PV with key 0 sucessfully deleted from vg vg00
Repair done, please do the following steps.....:
1.save /etc/lvmtab to another file
2.remove /etc/lvmtab
3.use vgscan(1m) -v to re-create /etc/lvmtab
4.NOW use vgcfgbackup(1m) to save the LVM setup
这里vgreduce命令给出了四个清理LVM文件的步骤，按这个步骤一一完成就行。
# cp /etc/lvmtab /etc/lvmtab.bck
# rm -f /etc/lvmtab
# vgscan -v
Creating "/etc/lvmtab".
vgscan: Couldn't access the list of physical volumes for volume group "/dev/vg00".
Physical Volume "/dev/dsk/c0t0d0" contains no LVM information
/dev/vg00
/dev/dsk/c3t5d0
Scan of Physical Volumes Complete.
#vgcfgbackup
#setboot -p 10/0/15/1.5.0
#setboot -a 10/0/15/1.5.0
至此，全部完成了Mirror的清理工作，重新启动系统，vgdisplay,lvdisplay等命令已经不再
有报错信息了，完成了全部测试工作。
总结：
在线清除故障根盘的Mirror信息步骤如下
1、用下面的命令确认故障硬盘的pv_key
lvdisplay -kv /dev/vg00/lvol1
......
lvdisplay -kv /dev/vg00/lvol8
2、用pv_key的方试去掉LV中的故障硬盘的Mirror信息
for i in 1 2 3 4 5 6 7 8
do
lvreduce -k -m 0 /dev/vg00/lvol$i 0 --最后那个0是上面确认的pv_key的值
done
3、vgreduce -f /dev/vg00
4、cp /etc/lvmtab /etc/lvmtab.bck
5、rm -f /etc/lvmtab
6、vgscan -v
7、vgcfgbackup
8、setboot -p
本文来自ChinaUnix博客，如果查看原文请点：http://blog.chinaunix.net/u/4005/showart_349599.html
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