Disk /dev/dm-0 doesn't contain a valid partition table
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 <[email protected]>
To: LVM general discussion and development <[email protected]>
Sent: Monday, May 21, 2007 10:28:35 AM
Subject: Re: [linux-lvm] Disk /dev/dm-0 doesn't contain a valid partition table
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Quoted 8 lines · Sean McGlynn
Hello,
I did an fdisk -l to review my partition table (see results below), and found four entries that end with "Disk
/dev/dm-Xdoesn'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.
Quoted 3 lines
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"
Quoted 6 lines
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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Quoted 10 lines · Sean McGlynn
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.
The "dev253" entries are the logical volumes (or other device-mapper devices), not the physical devices themselves.
I see you have three PVs in the volume group (sda1, sdb2 & sdc1), but how many LVs do you have in your volume group?
Just post the output of the "lvs" command if you're unsure.
Kind regards,
Bryn.
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