[linux-lvm] snapshot with bigmem broken
Heinz J . Mauelshagen
mauelshagen at sistina.com
Fri May 16 06:08:02 UTC 2003
On Wed, May 14, 2003 at 06:50:46AM -0400, Lauro, John wrote:
> I did more testing, and it appears that snapshots in LVM will not work
> with either 4GB or or 64GB support enabled in the kernel under 2.4.20.
> This includes both LVM 1.0.7 or the latest LVM2.
That's a known issue. You are faced with a VM flaw.
I presume that it's not LVM snapshots only bacause HIGHMEM is
> Is there anyone using LVM snapshots with 64GB RAM support (or even 4GB
> RAM support, as snapshots would be good for at least our medium size
> servers if not our large ones)? Is so, let me know the kernel version
> and LVM version you are using so that I can try it.
Probably not, because the system lifelocks on bounce buffers (which is
the sympton of the principle HIGHMEM bug).
Obviously not a lot of HIGHMEM users out there raising priorities to fix this.
> PS: As mentioned previously, everything else in LVM seems to be ok
> with larger kernel memory models. It's mainly just snapshots that
> appear to be broken using the latest LVMs and kernel.
Heinz -- The LVM Guy --
*** Software bugs are stupid.
Nevertheless it needs not so stupid people to solve them ***
Heinz Mauelshagen Sistina Software Inc.
Senior Consultant/Developer Am Sonnenhang 11
Mauelshagen at Sistina.com +49 2626 141200
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