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Re: [linux-lvm] how to access the partition on LV?



On Thu, Jul 28, 2005 at 01:13:50PM -0400, Ming Zhang wrote:
> On Thu, 2005-07-28 at 11:45 -0500, AJ Lewis wrote:
> > On Thu, Jul 28, 2005 at 11:17:41AM -0400, Ming Zhang wrote:
> > > I think this is a very common question but i can not find the answer.
> > > any idea on how to access the partition on these lv since no device
> > > node?
> > > 
> > > 
> > > [root fc3-i386-2 ~]# fdisk /dev/vg1/v1 -l
> > > 
> > > Disk /dev/vg1/v1: 469 MB, 469762048 bytes
> > > 255 heads, 63 sectors/track, 57 cylinders
> > > Units = cylinders of 16065 * 512 = 8225280 bytes
> > > 
> > >        Device Boot      Start         End      Blocks   Id  System
> > > /dev/vg1/v1p1               1          13      104391   83  Linux
> > > /dev/vg1/v1p2              14          57      353430   83  Linux
> > 
> 
> the problem is that we export a LV via iscsi to a remote box and become
> a scsi disk. so it is partitioned and utilized. then it does have
> partition on it. even it is exported to a linux box, u possibly will
> use /dev/sdx1 instead of directly use /dev/sdx, rite?

Ahh - I see.  Well, on the node exporting the LVs, you don't access it.  I
dunno if kpartx or some other partitioning tool could do it - it might.  But
as far as the standard partion handling code goes, LVs don't exist.  I know
why you're doing it this way - I don't know why you want to access the
partitions on the exporting (target) node.  Do you really need to?
 
> > You don't.  Don't put partition tables on LVs.  The whole point of using
> > LVM is you don't need to partition anymore, and your block devices can be
> > dynamic.  If you another block devices, you lvcreate it.  If you don't
> > have enough space in your VG, you add a PV to it, then lvcreate the new
> > block device.  Have you read through the HOWTO referenced below?
> 
> i can not see this HOWTO, where u referenced it?

It's at the bottom of all messages that go to the linux-lvm ML -
http://tldp.org/HOWTO/LVM-HOWTO/ 
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