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Re: [linux-lvm] determing lvm support



On Sat, 2003-12-20 at 04:30, Alasdair G Kergon wrote:
> On Fri, Dec 19, 2003 at 04:47:18PM -0800, Rich Turner wrote:
> > lvm2:
> > look for "vgcreate" command and
> Better to check for the new 'lvm' base command: other commands are
> links to it: check that running 'lvm version' produces complete output.
> That will also confirm that device-mapper is available in the live
> kernel and that /dev/mapper/control is set up correctly.
> (See device-mapper/scripts/devmap_mknod.sh)
if i have 'device-mapper' and 'lvm version' produces complete output, is
there anything else to check if lvm is supported on the system?

is 'device-mapper' used for anything else besides lvm?

does the kernel need to be built with 'lvm' support (which i believe was
true with lvm1-created 'lvm-mod'), or does building a kernel for 'lvm'
support just create 'dm-mod' loadable module/builtin 'dm-mod' kernel
support?

> > look for "device-mapper" in /proc/devices or
> It's better to check for that in /proc/misc, which will tell you whether
> or not device-mapper support is present in the running kernel.
why is it better to check in /proc/misc? when device-mapper support is
loaded, it shows up in both /proc/misc as well as /proc/devices.

> 
> > look for "dm-mod" in /lib/modules/[release]/kernel/drivers/md/*
> Better to attempt to load the module with modprobe and then do the
> tests above to check it worked.
>  
> Alasdair




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