Re: [linux-lvm] vgchange -a memory consumption

[Alasdair G Kergon <agk redhat com>]

On Fri, Jul 11, 2008 at 10:57:31PM -0700, Daniel Stodden wrote:
> I'm running, lvm2-2.02.26.
 
Don't bother investigating that version - stuff got changed.
Update to the latest release (or CVS) and try again.

> Why is that data reread? 

Because the two parts of the code are designed to be independent.  - The
so-called "activation" code sits behind an API in a so-called "locking"
module.  There's a choice of locking modules, and some send the requests
around a cluster of machines - remote machines will only run the
activation code and manage the metadata independently.  We just pass
UUIDs through the cluster communication layer, never metadata itself.

> Second: why isn't that memory freed after returning from
> activate_lv?
 
It's released after processing the whole command.  If there are cases
where too much is still being held while processing in the *current*
version of the code, then yes, you might be able to free parts of it
sooner.

Alasdair
-- 
agk redhat com