【AIX】0516-822 mklv: Unable to create logical volume.

之前针对外挂存储所在的VG进行创建裸设备，但是出现如下报错：

0516-822 mklv: Unable to create logical volume.
0516-018 lcreatelv: No more logical volumes can be created; the
        maximum number has been reached. Use a different volume group.

根据信息提示，查询了所在的VG详情：

# lsvg VG_DATA
VOLUME GROUP:       VG_DATA                  VG IDENTIFIER:  00f7ec6500004c0000000141de0918fd
VG STATE:           active                   PP SIZE:        1024 megabyte(s)
VG PERMISSION:      read/write               TOTAL PPs:      20460 (20951040 megabytes)
MAX LVs:            256                      FREE PPs:       16067 (16452608 megabytes)
LVs:                255                      USED PPs:       4393 (4498432 megabytes)
OPEN LVs:           0                        QUORUM:         11 (Enabled)
TOTAL PVs:          20                       VG DESCRIPTORS: 20
STALE PVs:          0                        STALE PPs:      0
ACTIVE PVs:         20                       AUTO ON:        no
MAX PPs per VG:     32768                    MAX PVs:        1024
LTG size (Dynamic): 1024 kilobyte(s)         AUTO SYNC:      no
HOT SPARE:          no                       BB POLICY:      relocatable 
MIRROR POOL STRICT: off                                       
PV RESTRICTION:     none                     INFINITE RETRY: no
#  

可以看出MAX LVs 为256个，而当前的LVs为255，若再创建，就会报错；

通过命令：

#smit chvg

修改如下：

 

修改完后检查：

# lsvg VG_DATA
VOLUME GROUP:       VG_DATA                  VG IDENTIFIER:  00f7ec6500004c0000000141de0918fd
VG STATE:           active                   PP SIZE:        1024 megabyte(s)
VG PERMISSION:      read/write               TOTAL PPs:      20460 (20951040 megabytes)
MAX LVs:            1024                     FREE PPs:       16067 (16452608 megabytes)
LVs:                255                      USED PPs:       4393 (4498432 megabytes)
OPEN LVs:           0                        QUORUM:         11 (Enabled)
TOTAL PVs:          20                       VG DESCRIPTORS: 20
STALE PVs:          0                        STALE PPs:      0
ACTIVE PVs:         20                       AUTO ON:        no
MAX PPs per VG:     32768                    MAX PVs:        1024
LTG size (Dynamic): 1024 kilobyte(s)         AUTO SYNC:      no
HOT SPARE:          no                       BB POLICY:      relocatable 
MIRROR POOL STRICT: off                                       
PV RESTRICTION:     none                     INFINITE RETRY: no
# 

继续创建，不再出错，问题解决。

PS：

从查看网上的资料上，有网友修改完后还出现如下错误：

0516-1616 chvg: This operation is only valid for scalable volume groups.
0516-732 chvg: Unable to change volume group datavg.

 

最后解决的办法是使用命令：
chvg -B train1vg    修改MAX LVs为512，此操作是把VG更改成Big Vg
另外
chvg -S train1vg    修改MAX LVs为4096,此操作把VG更改成scalable vg (-S的参数貌似是终止IO操作）