On 11/11/2010 11:46 AM, Stuart D. Gathman wrote:
On Wed, 10 Nov 2010, Mauricio Tavares wrote:
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?
Great. Now include output of "lvs"
raub@strangepork:~$ sudo lvs export
/dev/dm-0: read failed after 0 of 4096 at 0: Input/output error
LV VG Attr LSize Origin Snap% Move Log Copy% Convert
vms export -wi-a- 400.00g
raub@strangepork:~$
BTW, if you really suspect a disk error, test for it directly.
E.g., you can run
# dd if=/dev/sdc1 of=/dev/null bs=256k
to read through the partition or
# smartctl -t long /dev/sdc
To initiate a long self test of the disk (need smartmontools installed).
A brand new disk that flunks self test is indeed defective.
However, for real physical I/O errors, there would be errors logged
in /var/log/messages referencing sdc (as opposed to dm-0), so I still
think it is a logical error.
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