[linux-lvm] Question, what is the first 384 cyclinder in the PV?
Bryn M. Reeves
bmr at redhat.com
Mon Aug 1 09:24:16 UTC 2011
On 07/29/2011 06:35 PM, Jewsco Pius Jacquez wrote:
> I’m sorry, I mean the first 384 sector.
It's space reserved for lvm2 data used to manage the volume; This part of the
device contains the LVM2 label and metadata area. (it's before the first
physical extent in the volume).
> I am using RHEL5.6 kernel 2.6.18-238.12.1.el5 and have lvm2-2.02.74-5.el5. Here
> is my lvm.conf.
> Can an application data exist here? Like oracle data..
Not generally but lvm2 does not necessarily write to every location in this
region when initialising a new device so if there was existing data on the
device when pvcreate/vgcreate ran it will not have been overwritten.
> For instance, if I dd out from a PV with bs=512 and count=384 and I saw oracle
> data on it, is this ok?
It's not possible to say with this information - has oracle been configured to
use the whole disk?
If so then that's an error but if the data you are seeing is just "stale" data
from a previous use of the device it's not going to cause any problems.
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