[linux-lvm] current lvm function questions
Christoph Hellwig
hch at caldera.de
Thu Sep 28 16:32:43 UTC 2000
On Tue, Sep 26, 2000 at 06:20:44PM -0700, David Brower wrote:
> Area 1: Stable device naming.
>
> Is there a way in Linux to get a stable name for a
> disk that survive reconfiguration and discovery
> randomization?
There are lots ...
a) use scsidev(2) (for scsi disks only)
b) use devfs
c) use the linux software raid driver
d) use a hardware raid controller that has it's
own devfs-like naming scheme (ami, compaq)
e) use lvm - also it does not use UUIDs yet,
vgscan should detect all pvs of a vg.
f) mount you disk by-label instead of by-device
(LABEL: or UUID: entries in /etc/fstab)
> Specifically, if a pv/vg/lv is created on /dev/sda6, and
> a subsequent reconfig has that partition show up as
> /dev/sdb3, does it still show up as /dev/lvname?
It should. (but it's called /dev/vgname/lvname)
>
> 2. Raw device access
>
> Can lvm volumes be accessed as raw devices? If so, how?
Yes - in Linux 2.4 (or 2.2 w/ patches) you can simply bind
a raw device to any blockdevice. See raw(8) for details.
The device name will be /dev/raw/X
> Is there /dev/rlvname?
Nope.
Christoph
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