Server Fault is a question and answer site for system and network administrators. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I am trying to add a physical volume for use to add volume groups and thus LV inside them. Sadly I am getting the following error.

[root@server ~]# pvcreate /dev/sdb1
Device /dev/sdb1 not found (or ignored by filtering).

[root@server ~]# fdisk -l /dev/sdb

WARNING: GPT (GUID Partition Table) detected on '/dev/sdb'! The util fdisk doesn't support GPT. Use GNU Parted.

Disk /dev/sdb: 19966.2 GB, 19966213488640 bytes
255 heads, 63 sectors/track, 2427420 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

Device Boot      Start         End      Blocks   Id  System
/dev/sdb1               1      267350  2147483647+  ee  GPT

I would appreciate any help you could give. This would be my first time having to add a pv and when researching the issue I didn't come across anything that was of much help.

OS is centos 6 - 64bit


# By default we accept every block device:
filter = [ "a/.*/" ]

# Exclude the cdrom drive
# filter = [ "r|/dev/cdrom|" ]

# When testing I like to work with just loopback devices:
# filter = [ "a/loop/", "r/.*/" ]

# Or maybe all loops and ide drives except hdc:
# filter =[ "a|loop|", "r|/dev/hdc|", "a|/dev/ide|", "r|.*|" ]

# Use anchors if you want to be really specific
# filter = [ "a|^/dev/hda8$|", "r/.*/" ]


parted /dev/sdb "unit s" "print"
Model: Adaptec AdaptecRAID5 (scsi)
Disk /dev/sdb: 38996510720s
Sector size (logical/physical): 512B/512B
Partition Table: gpt
share|improve this question
OK, so what filters do you have in /etc/lvm.conf? And while you're at it, show us your partition table. – Michael Hampton Aug 2 '13 at 21:34
Show these with grep filter /etc/lvm.conf and parted /dev/sdb "unit s" "print" – suprjami Aug 2 '13 at 21:39
Filters: – awmusic12635 Aug 2 '13 at 21:46
Parted: – awmusic12635 Aug 2 '13 at 21:49
up vote 6 down vote accepted

The partition type in the MBR is set to "ee" meaning that there should be a GPT partition table on the disk, but as parted shows, there isn't a GPT table at all.

You need to either:
a) use parted to make a GPT partition, and use that partition as the PV
b) remove the partition table from the MBR altogether and just use block device /dev/sdb as the PV

share|improve this answer
I used parted to make a GPT partition. I then went to format it : mkfs.ext4 /dev/sdb1 mke2fs 1.41.12 (17-May-2010) mkfs.ext4: Size of device /dev/sdb1 too big to be expressed in 32 bits using a blocksize of 4096. – awmusic12635 Aug 2 '13 at 22:17
@awmusic12635 you won't format this partition, you'll use pvcreate to turn it into a physical volume, lvcreate to create logical volume(s) from it and then you'll format the logical volumes with a filesystem. – DerfK Aug 2 '13 at 23:02
You're using EL6. The maximum possible ext4 filesystem size is restricted to 16Tb because EL6 mkfs does not know about the 64bit filesystem flag. If you had EL7, you could make a 19Tb ext4 filesystem. Either use another filesystem like XFS, or do what @DerfK said and make smaller LVM Logical Volumes. – suprjami Oct 4 '14 at 5:09

Your parted output shows that you don't have any partitions, thus /dev/sdb1 doesn't exist. You need to create the partition first.

share|improve this answer
Odd, It seems fdisk and parted gave different outputs. Thanks – awmusic12635 Aug 2 '13 at 21:58

I found that I either needed to reboot the server or run 'partprobe /dev/sdaX' in order for pvcreate to be properly informed of the partition.

Also, fdisk is not lvm aware so it was handing out errors about partitions making me think there was a bigger problem when that was simply not the case.

share|improve this answer

The block device type could also be a problem. If you run pvcreate with -vvvv and you see an error like "Skipping: Unrecognised LVM device type 251", then you have to add the magic number to the allowed devices list.

Just look up the device type for the number in /proc/devices and add it to the devices section of the lvm config /etc/lvm/lvm.conf, for example:

types = [ "bcache", 251 ]

That's it, you can now use pvcreate as expected.

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.