[linux-lvm] using DM/LVM to provide "chunked" view of devic

[linux-lvm] using DM/LVM to provide "chunked" view of devic

[Pete Flugstad]

Hello!

I'm wondering if I can use LVM (or rather Device Mapper) to provide a
"chunked" or "split" view of a device (such as a block device or partition).

Specifically if I have a block device (i.e. /dev/hde1) that is 60GB, and
I want to view it in 1GB chunks, say /dev/hde1.000 to /dev/hde1.059 or
something like that.  That way I could, for example, setup a FTP or HTTP
server to view these and download them over the network (of course I'd
need to modify the server to be able to read from a block device),
rather than having to download the entire 60 GB block device.

Is it possible to use DM/LVM to provide a view of the device like this?
I am using Linux 2.6.X.

Thanks,
Pete

Re: [linux-lvm] using DM/LVM to provide "chunked" view of devic

[Joe Thornber]

On Thu, Mar 18, 2004 at 07:45:30AM -0600, Pete Flugstad wrote:
> Hello!
> 
> I'm wondering if I can use LVM (or rather Device Mapper) to provide a
> "chunked" or "split" view of a device (such as a block device or partition).
> 
> Specifically if I have a block device (i.e. /dev/hde1) that is 60GB, and
> I want to view it in 1GB chunks, say /dev/hde1.000 to /dev/hde1.059 or
> something like that.  That way I could, for example, setup a FTP or HTTP
> server to view these and download them over the network (of course I'd
> need to modify the server to be able to read from a block device),
> rather than having to download the entire 60 GB block device.
> 
> Is it possible to use DM/LVM to provide a view of the device like this?
> I am using Linux 2.6.X.

Yep, you can do this with either LVM (taking care not to put a label
on the PV) or just with dm by setting up simple tables with a single
linear mapping in them (see the dmsetup man page).

- Joe