Re: [linux-lvm] Bad disk?

[Mauricio Tavares <raubvogel gmail com>]

On 11/10/2010 12:41 PM, Stuart D. Gathman wrote:
> On Wed, 10 Nov 2010, Mauricio Tavares wrote:
>
> > Those dm-0 messages do not make me happy. dmesg and vgchange make me think the
> > problem is on the new drive:
>
> Those dm-0 messages are probably a logical error.  For instance, a snapshot
> that is full would give those errors.  You need to tell us what dm-0 is
> mapped to.  Look in /dev/mapper for starters.
	Sorry for that: I did not think it would be there. But, as you said, it is:

lrwxrwxrwx 1 root root      7 2010-11-10 09:30 export-vms -> ../dm-0

the export vg is in /dev/sdc1.

> > [  268.024593] scsi 0:0:0:0: Direct-Access     ATA      ST3500320NS  SN04 PQ:
> > 0 ANSI: 5
> > [  268.024900] sd 0:0:0:0: [sdc] 976773168 512-byte logical blocks: (500
> > GB/465 GiB)
> > [  268.024918] sd 0:0:0:0: Attached scsi generic sg2 type 0
> > [  268.024996] sd 0:0:0:0: [sdc] Write Protect is off
> > [  268.025003] sd 0:0:0:0: [sdc] Mode Sense: 00 3a 00 00
> > [  268.025046] sd 0:0:0:0: [sdc] Write cache: enabled, read cache: enabled,
> > doesn't support DPO or FUA
> > [  268.025377]  sdc: sdc1
> > [  268.049853] sd 0:0:0:0: [sdc] Attached SCSI disk
>
> This is normal for your new disk.
>
> > [  335.467482] quiet_error: 3 callbacks suppressed
> > [  335.467492] Buffer I/O error on device dm-0, logical block 104857584
> > [  335.467540] Buffer I/O error on device dm-0, logical block 104857584
> > [  335.467589] Buffer I/O error on device dm-0, logical block 104857598
> > [  335.467615] Buffer I/O error on device dm-0, logical block 104857598
> > [  335.467647] Buffer I/O error on device dm-0, logical block 0
> > [  335.467671] Buffer I/O error on device dm-0, logical block 0
> > [  335.467703] Buffer I/O error on device dm-0, logical block 1
> > [  335.467734] Buffer I/O error on device dm-0, logical block 104857599
> > [  335.467762] Buffer I/O error on device dm-0, logical block 104857599
> > [  335.467788] Buffer I/O error on device dm-0, logical block 104857599
>
> Again, this is on dm-0, not sdc.
>
> > raub strangepork:~$ sudo sfdisk -l /dev/sdc
> >
> > Disk /dev/sdc: 60801 cylinders, 255 heads, 63 sectors/track
> > Units = cylinders of 8225280 bytes, blocks of 1024 bytes, counting from 0
> >
> >     Device Boot Start     End   #cyls    #blocks   Id  System
> > /dev/sdc1          0+  60800   60801- 488384001   8e  Linux LVM
> > /dev/sdc2          0       -       0          0    0  Empty
> > /dev/sdc3          0       -       0          0    0  Empty
> > /dev/sdc4          0       -       0          0    0  Empty
>
> This is normal, not sure what is has to do with filesystem desciptors.
>
> Tell us exactly what you mean by "put a LVM on it".  Did you run
> pvcreate?  vgcreate?  lvcreate? You might find the output of "pvs"
> enlightening.  That will tell us what PVs you have created.
> And list /dev/mapper so we know what dm-0 is, and include the output of "lvs".
	Let me put this way, I thought I did. I mean, after creating the 
partition, setting it to LVM (8e), then running

pvcreate /dev/sdc1
vgcreate export /dev/sdc1
lvcreate -L 400G --name vms export

I used mkfs.ext4 to create partition (on /dev/mapper/export-vms) and off 
I went. Do you think I missed a step?