【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; themaximum 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_DATAVOLUME GROUP:VG_DATAVG IDENTIFIER: 00f7ec6500004c0000000141de0918fdVG STATE:activePP SIZE:1024 megabyte(s)VG PERMISSION:read/writeTOTAL PPs:20460 (20951040 megabytes)MAX LVs:256FREE PPs:16067 (16452608 megabytes)LVs:255USED PPs:4393 (4498432 megabytes)OPEN LVs:0QUORUM:11 (Enabled)TOTAL PVs:20VG DESCRIPTORS: 20STALE PVs:0STALE PPs:0ACTIVE PVs:20AUTO ON:noMAX PPs per VG:32768MAX PVs:1024LTG size (Dynamic): 1024 kilobyte(s)AUTO SYNC:noHOT SPARE:noBB POLICY:relocatable MIRROR POOL STRICT: offPV RESTRICTION:noneINFINITE 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_DATAVOLUME GROUP:VG_DATAVG IDENTIFIER: 00f7ec6500004c0000000141de0918fdVG STATE:activePP SIZE:1024 megabyte(s)VG PERMISSION:read/writeTOTAL PPs:20460 (20951040 megabytes)MAX LVs:1024FREE PPs:16067 (16452608 megabytes)LVs:255USED PPs:4393 (4498432 megabytes)OPEN LVs:0QUORUM:11 (Enabled)TOTAL PVs:20VG DESCRIPTORS: 20STALE PVs:0STALE PPs:0ACTIVE PVs:20AUTO ON:noMAX PPs per VG:32768MAX PVs:1024LTG size (Dynamic): 1024 kilobyte(s)AUTO SYNC:noHOT SPARE:noBB POLICY:relocatable MIRROR POOL STRICT: offPV RESTRICTION:noneINFINITE 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scalablevg(-S的参数貌似是终止IO操作）
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，没有人会帮你一辈子，所以你要奋斗一生。
