[root@RAC2 ~]# mke2fs /dev/sdb1
mke2fs 1.39 (29-May-2006)
/dev/sdb1 is apparently in use by the system; will not make a filesystem here!
[root@RAC2 ~]#
[root@RAC2 ~]# dmsetup status
vbirdvg-vbirdlv2: 0 204800 linear
vbirdvg-vbirdlv1: 0 204800 linear
vbirdvg-vbirdlv1: 204800 2097152 linear
刚测试的有一个vg，将该vg删除。
[root@RAC2 ~]# vgremove vbirdvg
或者
[root@localhost ~]# dmsetup remove_all
[root@localhost ~]# dmsetup status
No devices found
dmsetup，这个命令帮助我们“组装”、“解散”、“监视”我们自己的虚拟存储结构。
SYNOPSIS
dmsetup help [-c|-C|--columns]
dmsetup create device_name [-u uuid] [--notable | --table <table> | table_file]
dmsetup remove [-f|--force] device_name
dmsetup remove_all [-f|--force]
dmsetup suspend [--nolockfs] [--noflush] device_name
dmsetup resume device_name
dmsetup load device_name [--table <table> | table_file]
dmsetup clear device_name
dmsetup reload device_name [--table <table> | table_file]
dmsetup rename device_name new_name
dmsetup message device_name sector message
dmsetup ls [--target target_type] [--exec command] [--tree [-o options]]
dmsetup info [device_name]
dmsetup info -c|-C|--columns [--noheadings] [--separator separator] [-o fields] [-O|--sort sort_fields] [device_name]
dmsetup deps [device_name]
dmsetup status [--target target_type] [device_name]
dmsetup table [--target target_type] [device_name]
dmsetup wait device_name [event_nr]
dmsetup mknodes [device_name]
dmsetup udevflags cookie
dmsetup udevcomplete cookie
dmsetup udevcomplete_all
dmsetup udevcookies
dmsetup targets
dmsetup version
dmsetup setgeometry device_name cyl head sect start
dmsetup splitname device_name [subsystem]
devmap_name major minor
devmap_name major:minor
