pvcreate出现错误：Device /dev/sdb1 not found (or ignored by filtering).

错误信息：

[root@compute2 ~]# pvcreate -vvv /dev/sdb1

……

Device /dev/sdb1 not found (or ignored by filtering).

No devices to process.

Unlocking /run/lock/lvm/P_orphans

_undo_flock /run/lock/lvm/P_orphans

lvmcache has no info for vgname "#orphans".

Setting global/notify_dbus to 1

Completed: pvcreate -vvv /dev/sdb1

解决思路：

1. 查看是否有/dev/sdb1的分区

如果没有分区，通过下面的命令创建分区：

fdisk /dev/sdb

附：如果想删除上面的分区重新做分区，可以用

dd if=/dev/urandom of=/dev/sdb bs=512 count=64

2. 如果步骤1没有问题，再看一下/etc/lvm/lvm.conf中的“devices”字段中的“filters”是否有a/sdb/。

# Configuration section devices.

# How LVM uses block devices.

devices {

……

# Configuration option devices/filter.

# Limit the block devices that are used by LVM commands.

# This is a list of regular expressions used to accept or reject block

# device path names. Each regex is delimited by a vertical bar '|'

# (or any character) and is preceded by 'a' to accept the path, or

# by 'r' to reject the path. The first regex in the list to match the

# path is used, producing the 'a' or 'r' result for the device.

# When multiple path names exist for a block device, if any path name

# matches an 'a' pattern before an 'r' pattern, then the device is

# accepted. If all the path names match an 'r' pattern first, then the

# device is rejected. Unmatching path names do not affect the accept

# or reject decision. If no path names for a device match a pattern,

# then the device is accepted. Be careful mixing 'a' and 'r' patterns,

# as the combination might produce unexpected results (test changes.)

# Run vgscan after changing the filter to regenerate the cache.

# See the use_lvmetad comment for a special case regarding filters.

#

# Example

# Accept every block device:

# filter = [ "a|.*/|" ]

# Reject the cdrom drive:

# filter = [ "r|/dev/cdrom|" ]

# Work with just loopback devices, e.g. for testing:

# filter = [ "a|loop|", "r|.*|" ]

# Accept all loop devices and ide drives except hdc:

# filter = [ "a|loop|", "r|/dev/hdc|", "a|/dev/ide|", "r|.*|" ]

# Use anchors to be very specific:

# filter = [ "a|^/dev/hda8$|", "r|.*/|" ]

#

# This configuration option has an automatic default value.

# filter = [ "a|.*/|" ]

#filter = [ "a/sda/", "r/.*/"]

filter = [ "a/sda/", "a/sdb/", "r/.*/"]