From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx1.redhat.com (mx1.redhat.com [172.16.48.31]) by int-mx1.corp.redhat.com (8.13.1/8.13.1) with ESMTP id l4LFH4tH030241 for ; Mon, 21 May 2007 11:17:06 -0400 Received: from web38204.mail.mud.yahoo.com (web38204.mail.mud.yahoo.com [209.191.124.147]) by mx1.redhat.com (8.13.1/8.13.1) with SMTP id l4LFGqdH015619 for ; Mon, 21 May 2007 11:16:52 -0400 Date: Mon, 21 May 2007 08:16:46 -0700 (PDT) From: Sean McGlynn Subject: Re: [linux-lvm] Disk /dev/dm-0 doesn't contain a valid partition table MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="0-487209000-1179760606=:69660" Message-ID: <352095.69660.qm@web38204.mail.mud.yahoo.com> Reply-To: LVM general discussion and development List-Id: LVM general discussion and development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , List-Id: To: LVM general discussion and development --0-487209000-1179760606=:69660 Content-Type: text/plain; charset=ascii Bryn, Thank you for taking the time to reply. I'm glad to see this is not an issue. As for "dev253," if I only have three physical devices, why four dm entries? Thanks again. ----- Original Message ---- From: Bryn M. Reeves To: LVM general discussion and development Sent: Monday, May 21, 2007 10:28:35 AM Subject: Re: [linux-lvm] Disk /dev/dm-0 doesn't contain a valid partition table -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Sean McGlynn wrote: > Hello, > > > > I did an fdisk -l to review my partition table (see results below), and > found four entries that end with "Disk /dev/dm-X doesn't contain a valid > partition table." I don't recall seeing this in the past, so I believe > it is something new. Later kernels include dm devices in the list of partitions in proc, so fdisk will attempt to scan them for partition tables. It's not harmful, just noise. > I recently began using kernel 2.6.21.1, up from 2.6.9-42. I don't know > if perhaps this had some effect, or if the entries are normal and I just > never noticed them. If you don't like it & you've not configured anything to use /dev/dm-* devices directly (instead of /dev/mapper/* or /dev//* or whatever) then you can reconfigure udev to not create the dm-* nodes. - From memory, you need to comment out the rule that begins "KERNEL="dm-[0-9]*" in /etc/udev/rules.d/50-udev.rules, or, for newer udevs you can add ignore_device: KERNEL=="dm-[0-9]*", ACTION=="add", OPTIONS+="ignore_device" > > > What led me here is that sar -d output includes four entries for hard > drives (dev253 entries) when there are only three on my system. Fdisk > is reporting four DM devices, so I'm thinking there is some correlation, > but I don't know what. Those "dev253" entries are your device-mapper devices. Take a look at /dev/dm-* with ls -l and you will see that the major number is 253. Kind regards, Bryn. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (GNU/Linux) Comment: Using GnuPG with Fedora - http://enigmail.mozdev.org iD8DBQFGUayT6YSQoMYUY94RAqJKAJ9dFJtaRg3fONo7kLOkDezcS/FizwCcDwFj 2McvW5Wl+zudmUZDO2aE1fQ= =NHOE -----END PGP SIGNATURE----- _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/ ____________________________________________________________________________________ Moody friends. Drama queens. Your life? Nope! - their life, your story. Play Sims Stories at Yahoo! Games. http://sims.yahoo.com/ --0-487209000-1179760606=:69660 Content-Type: text/html; charset=ascii

Bryn,

Thank you for taking the time to reply.

I'm glad to see this is not an issue.

As for "dev253," if I only have three physical devices, why four dm entries?

Thanks again.

----- Original Message ----
From: Bryn M. Reeves <breeves@redhat.com>
To: LVM general discussion and development <linux-lvm@redhat.com>
Sent: Monday, May 21, 2007 10:28:35 AM
Subject: Re: [linux-lvm] Disk /dev/dm-0 doesn't contain a valid partition table

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Sean McGlynn wrote:
> Hello,
>
>
>
> I did an fdisk -l to review my partition table (see results below), and
> found four entries that end with "Disk /dev/dm-X doesn't contain a valid
> partition table."  I don't recall seeing this in the past, so I believe
> it is something new.

Later kernels include dm devices in the list of partitions in proc, so
fdisk will attempt to scan them for partition tables. It's not harmful,
just noise.

> I recently began using kernel 2.6.21.1, up from 2.6.9-42.  I don't know
> if perhaps this had some effect, or if the entries are normal and I just
> never noticed them.

If you don't like it & you've not configured anything to use /dev/dm-*
devices directly (instead of /dev/mapper/* or /dev/<volgroup>/* or
whatever) then you can reconfigure udev to not create the dm-* nodes.

- From memory, you need to comment out the rule that begins
"KERNEL="dm-[0-9]*" in /etc/udev/rules.d/50-udev.rules, or, for newer
udevs you can add ignore_device:

KERNEL=="dm-[0-9]*", ACTION=="add", OPTIONS+="ignore_device"

>
>
> What led me here is that sar -d output includes four entries for hard
> drives (dev253 entries) when there are only three on my system.  Fdisk
> is reporting four DM devices, so I'm thinking there is some correlation,
> but I don't know what.

Those "dev253" entries are your device-mapper devices. Take a look at
/dev/dm-* with ls -l and you will see that the major number is 253.

Kind regards,
Bryn.

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Comment: Using GnuPG with Fedora - http://enigmail.mozdev.org

iD8DBQFGUayT6YSQoMYUY94RAqJKAJ9dFJtaRg3fONo7kLOkDezcS/FizwCcDwFj
2McvW5Wl+zudmUZDO2aE1fQ=
=NHOE
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