把mirror解掉，再从rootvg里面提出来，再用diag确认下，再用命令删掉hdisk1，更换
更换前的准备
1.查看报错日志。
执行errpt列出报错条目
IDENTIFIER TIMESTAMP T C RESOURCE_NAME DESCRIPTION
A39F8A49 0611123015 T S syserrlg ERROR LOGGING BUFFER OVERFLOW
B6267342 0611123015 P H hdisk0 DISK OPERATION ERROR
A39F8A49 0611123015 T S syserrlg ERROR LOGGING BUFFER OVERFLOW
从上面的输出中找出对应的IDENTIFIER，查看报错详情：errpt
-aj B6267342|more
LABEL: SC_DISK_ERR2
IDENTIFIER: B6267342
Date/Time: Tue Oct 24 09:15:4
9 BEIST 2017
Sequence Number: 1510
Machine Id: 00C89B354C00
Node Id: DCBJLSFX04
Class: H
Type: PERM
Resource Name: hdisk0
Resource Class: disk
Resource Type: scsd
Location: U78A0.001.DNWHKW3-P2-D4
VPD:
Manufacturer................IBM
Machine Type and Model......ST3146356SS
FRU Number..................10N7204
ROS Level and ID............45363046
Serial Number...............3QN2WT58
EC Level....................D76038
Part Number.................10N7203
Device Specific.(Z0)........000005329F001002
Device Specific.(Z1)........0120E60F
Device Specific.(Z2)........0021
Device Specific.(Z3)........09347
Device Specific.(Z4)........
Device Specific.(Z5)........22
Device Specific.(Z6)........D76038
Description
DISK OPERATION ERROR
Probable Causes
DASD DEVICE
Failure Causes
DISK DRIVE
DISK DRIVE ELECTRONICS
Recommended Actions
PERFORM PROBLEM DETERMINATION PROCEDURES
Detail Data
PATH ID
0
SENSE DATA
0A00 2A00 0751 0B30 0000 4804 0000 0000 0000 0000 0000 0000 0102 0000 7000 0100
0000 0018 0000 0000 5D00 0800 0000 0000 015D 0008 FFFF FFFF FFFF 0000 0000 0000
0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000
0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000
0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000
0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000
0000 0000 0000 0000 18C2 000B D900 0000 0000 0000 0000 0000 0000 0000 0083 0000
0000 0010 000D
Diagnostic Analysis
Diagnostic Log sequence number: 2049
Resource tested: hdisk0
Resource Description: SAS Disk Drive
Location: U78A0.001.DNWHKW3-P2-D4
SRN: 2556-130
Description: Error log analysis indicates problem reported by disk
drive's self monitoring function.
Possible FRUs:
hdisk0 FRU: 10N7204 U78A0.001.DNWHKW3-P2-D4
SAS Disk Drive
2.查看HDISK0的S/N，P/N号等，在换盘的时候做对照 lscfg
–vl hdisk0 ：
hdisk0U78A0.001.DNWHKW3-P2-D4 Other SCSI Disk Drive
Manufacturer................MAXTOR
Machine Type and Model......ATLAS10K5_73SCA
ROS Level and ID............4A4E5A48
Serial Number...............D210K4XK
Device Specific.(Z0)........000003025B00013E
Device Specific.(Z1)........
注意location号U78A0.001.DNWHKW3-P2-D4要与机器对应无误
3.确认原有的状态
显示一个卷组中的所有物理卷信息，名称，状态，和分区情况：lsvg -p rootvg
rootvg:
PV_NAME PV STATE TOTAL PPs FREE PPs FREE DISTRIBUTION
hdisk0 missing 548 503 109..100..75..109..110
hdisk1 active 548 503 109..100..75..109..110
# lsvg -p rootvg
rootvg:
PV_NAME PV STATE TOTAL PPs FREE PPs FREE DISTRIBUTION
hdisk0 active 558 351 111..12..05..111..112
hdisk1 missing 558 351 111..17..00..111..112
# lsvg -p datavg
datavg:
PV_NAME PV STATE TOTAL PPs FREE PPs FREE DISTRIBUTION
hdisk2 active 558 157 112..00..00..00..45
hdisk3 active 558 157 111..00..00..00..46
确认镜像状态 lsvg -l rootvg
rootvg:
LV NAME TYPE LPs PPs PVs LV STATE MOUNT POINT
hd5 boot 1 2 2 closed/stale N/A
hd6 paging 8 16 2 open/syncd N/A
hd8 jfs2log 1 2 2 open/stale N/A
hd4 jfs2 2 4 2 open/stale /
hd2 jfs2 19 38 2 open/stale /usr
hd9var jfs2 5 10 2 open/stale /var
hd3 jfs2 1 2 2 open/stale /tmp
hd1 jfs2 1 2 2 open/stale /home
hd10opt jfs2 4 8 2 open/stale /opt
hd11admin jfs2 1 2 2 open/stale /admin
livedump jfs2 2 4 2 open/stale /var/adm/ras/livedump
注意LPs和PPs一定要为1：2
查看rootvg卷组的详细信息及状态：lsvg rootvg
VOLUME GROUP: rootvg VG IDENTIFIER: 00c57e5f00004c000000015f342b9397
VG STATE: active PP SIZE: 128 megabyte(s)
VG PERMISSION: read/write TOTAL PPs: 1096 (140288 megabytes)
MAX LVs: 256 FREE PPs: 1006 (128768 megabytes)
LVs: 11 USED PPs: 90 (11520 megabytes)
OPEN LVs: 10 QUORUM: 1 (Disabled)
TOTAL PVs: 2 VG DESCRIPTORS: 3
STALE PVs: 1 STALE PPs: 31
ACTIVE PVs: 1 AUTO ON: yes
MAX PPs per VG: 32512
MAX PPs per PV: 1016 MAX PVs: 32
LTG size (Dynamic): 128 kilobyte(s) AUTO SYNC: no
HOT SPARE: no BB POLICY: relocatable
PV RESTRICTION: none INFINITE RETRY: no
注意STALE PVs/PPs数量
4.迁移dump设备
因为原先系统在做镜像时，dump设备不会被镜像，所以现在要确定好dump设备的位置
如果在坏盘hdisk0上，此时应当迁移至hdisk1上。反之，如果在好盘hdisk1上，则无需此迁移步骤。
确认dump设备位置：lspv -l hdisk0,lspv -l hdisk1
hdisk0:
LV NAME LPs PPs DISTRIBUTION MOUNT POINT
hd6 2 4 00..02..00..00..00 N/A
hd8 1 2 00..00..01..00..00 N/A
hd5 1 2 01..00..00..00..00 N/A
hd9var 4 8 00..00..04..00..00 /var
hd3 16 32 00..00..16..00..00 /tmp
hd4 8 16 00..00..08..00..00 /
hd2 16 32 00..00..16..00..00 /usr
hd1 4 8 00..00..04..00..00 /home
hd10opt 11 22 00..00..11..00..00 /opt
livedump 1 2 00..01..00..00..00 /var/adm/ras/livedump
lg_dumplv 4 4 00..04..00..00..00 N/A
hd11admin 1 2 00..00..01..00..00 /admin
在hdisk0上，须做迁移：migratepv -l lg_dumplv hdisk0 hdisk1
确认lg_dumplv已经迁移到hdisk1上：lspv -l hdisk1
把HDISK0从ROOTVG的镜像中移除 unmirrorvg
rootvg hdisk0
0516-1246 rmlvcopy: If hd5 is the boot logical volume, please run 'chpv -c <diskname>'
as root user to clear the boot record and avoid a potential boot
off an old boot image that may reside on the disk from which this
logical volume is moved/removed.
0516-1804 chvg: The quorum change takes effect immediately.
0516-1144 unmirrorvg: rootvg successfully unmirrored, user should perform
bosboot of system to reinitialize boot records. Then, user must modify
bootlist to just include: hdisk1.
查看物理卷状态 lspv rootvg
hdisk0 00c57e5fa8a95af5 rootvg active
hdisk1 00c3f435d0f4916c rootvg active
查看pv上的逻辑卷状态（LPs和PPs的比例为1：1）lspv
-l hdisk1hdisk1:
LV NAME LPs PPs DISTRIBUTION MOUNT POINT
LV NAME LPs PPs DISTRIBUTION MOUNT POINT
hd6 2 2 00..02..00..00..00 N/A
hd8 1 1 00..00..01..00..00 N/A
hd5 1 1 01..00..00..00..00 N/A
hd9var 4 4 00..00..04..00..00 /var
hd3 16 16 00..00..16..00..00 /tmp
hd4 8 8 00..00..08..00..00 /
hd2 16 16 00..00..16..00..00 /usr
hd1 4 4 00..00..04..00..00 /home
hd10opt 11 11 00..00..11..00..00 /opt
livedump 1 1 00..01..00..00..00 /var/adm/ras/livedump
lg_dumplv 4 4 00..04..00..00..00 N/A
hd11admin 1 1 00..00..01..00..00 /admin
这时HDISK0不再和HDISK1为MIRROR ，把hdisk0从rootvg中去除 reducevg
rootvg hdisk0
更换新硬盘
AIX上通过diag判定DISK位置
#diag 执行命令回车
选择黑色部分
用PgDn键翻页找到Hot plug Task回车
选择黑色部分，回车
继续选择黑色部分
选择想判定位置的目标DISK，比如：hdisk0
回车，这个时候去观察硬盘，你会发现硬盘的指示灯会显示"红色"，这个硬盘就是你需要判定的目标盘。
如果想把这个有故障的硬盘从SCSI剔除,用F3返回上一级菜单选择"Replace/Remove
a Device Attached to an SCSI Hot Swap Enclosure Device"
光标移到hdisk0处，回车
然后拔掉故障磁盘，插上新的磁盘，执行cfgmgr –v,重新识别出新插的磁盘。
消除系统警告灯
选择黑色部分，回车
用Enter键选择黑色部分，在按F7或者Esc+7键commit
（这里再补充另一种删除硬盘的方法：reducevg后执行rmdev -dl hdisk0 但非常不推荐使用。具体步骤请自行百度）
重做镜像
确认新盘hdisk0是否有PVID：lspv
rootvg
hdisk000c2f65fa4a27df5 none none
hdisk1 00c3f435d0f4916c rootvg active
上面标红的即是。
如果没有，需要手动添加：chdev -l hdisk0 -a pv=yes
HDISK0出现后， 把HDISK0加到ROOTVG中
#extendvg rootvg hdisk0
做MIRROR mirrorvg –S rootvg (也可执行mirrorvg
–c 2 rootvg 等待时间较长)
0516-1804 chvg: The quorum change takes effect immediately.
0516-1126 mirrorvg: rootvg successfully mirrored, user should perform
bosboot of system to initialize boot records. Then, user must modify
bootlist to include: hdisk1 hdisk0.
查看PV lspv
Hdisk0 00x9k241k2l3811n rootvg active
hdisk1 00c3f435d0f4916c rootvg active
在HDISK0上创建boot image
bosboot –ad hdisk0
bosboot: Boot image is 51228 512 byte blocks
先确认当前启动顺序bootlist –m normal -o
改变启动设备的顺序 bootlist –m normal hdisk0 hdisk1 cd0
确认修改后的启动顺序bootlist –m normal -o
后续操作：在HMC上关闭事件，系统中执行errclear 0清空相关报错。