Re: [linux-lvm] Red Hat Advanced Server + LVM

[Geoff Dolman <geoff dolman cimr cam ac uk>]

On Fri, 2003-06-20 at 12:02, Heinz J . Mauelshagen wrote:
> On Fri, Jun 20, 2003 at 10:50:32AM +0100, Geoff Dolman wrote:
> > Hi
> > 
> > I am soon to take delivery of a new Server: It's configuration is to be
> > 
> > 584GB disk (hardware raid5) 4 cpu (with Intel hyperthreading)
> > 
> > 32 GB RAM
> > 
> > 
> > I intend to use RH Advanced Server 2.1 (whatever the latest kernel is at
> > time of install).
> > 
> > I would ideally like to be able to snapshot dump this machine (the
> > largest partition will use most of the available disk space (4-500GB)).
> > 
> > Is there any caveat or issue that I should be aware of with lvm in this
> > configuration?
> 
> Snapshots trigger a virtual memory problem with highmem enabled in kernel 2.4 :(
> 
> The snapshot exception tables hold in RAM can grow quite big in case
> of large snapshot sizes (which you might not need in case your filesystem(s)
> are not heavily updated during the lifetime of the snapshot).
> 

Hi Heinz

What do you recommend I do? What is (if any) the largest filesystem I
can snapshot in this set-up?

-- 
Geoff Dolman <geoff dolman cimr cam ac uk>