[linux-lvm] Swap/DB devices (fwd)
Heinz Mauelshagen
mauelsha at ez-darmstadt.telekom.de
Sat Apr 17 13:22:29 UTC 1999
On Sat, 17 Apr 1999 01:14:00 +0100 (BST), Stephen Tweedie
<sct at redhat.com> wrote:
>
> On Fri, 16 Apr 1999 23:47:06 METDST, Heinz Mauelshagen
> <mauelsha at ez-darmstadt.telekom.de> said:
>
> >> I'm curious: why? I would have thought that LVM should support any
> >> requests coming in through ll_rw_block already.
>
> > It's simply a matter of userland (lv_create_node() and friends in lvmlib)
> > to create the LVM 'raw' device specials.
> > Only regular buffer cached device specials are created up to 0.6.
>
> You won't need to. The raw device patches create one single new major
> number, and let you bind the minor numbers to any block devices you
> want. You can access _any_ block device driver without modification.
>
The LVM lib creates the device special nodes dynamically if a logical volume
is created by lvcreate(8) or found by vgscan(8)/vgimport(8).
LVM function lv_create_node() has to be extended to create the raw device too.
The LVM driver can then be accessed by that raw device node
_without_ modification.
Heinz
--
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Systemmanagement C/S Deutsche Telekom AG
Entwicklungszentrum Darmstadt
Heinz Mauelshagen Otto-Roehm-Strasse 71c
Senior Systems Engineer Postfach 10 05 41
64205 Darmstadt
mge at ez-darmstadt.telekom.de Germany
+49 6151 886-425
FAX-386
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