Re: Nortel Alteon and persistence

Hi AlianB,

Hash metric does not maintain persistency when a faulty servers comes back
or a new server is added. While phash can do the job. It is a superset of
minmiss and hash functionality. Better to use phash to maintain exact
persistency.

The application guide extensively describes the group metrics and how they
behave when servers goes down or new servers are added etc.,

check this link
http://www142.nortelnetworks.com/mdfs_app/techdoc/enterprise/other/ASOS_24.0.0/pdf/NN47220-104_01.05_ASOS_AG.pdf

I wonder I could not find application guide in their new home
http://radwarealteon.com

Thanks,
_Ravi.

On Sun, Jul 12, 2009 at 5:07 PM, MaximK <[email protected]> wrote:

>
> AFAIK hash function value should not be affected by introducing new server
> to
> the group,so you shouldn't see any disconnection of existing clients.
> However if one server goes down, the hash will be recalculated.
>
>
>
> Regards,
> Max
>
>
>
> AlainB wrote:
> >
> > Hi,
> >
> > One question about the persistence metric (minmisses, hash or phash)
> using
> > one Alteon : it's OK, those metrics can stick one client to every time
> the
> > same server. And, if one real server is down, the Alteon can connect
> > another server to the client session.
> > But what is the behavior of the Alteon if the faulty server is back again
> > ? Or if the administrator adds another server to the group ? How is
> > managed this kind of event ? Are there any disconnection of existing
> > sessions ?
> > I can not find any documentation about this subjet. This is why I would
> > appreciate any help relating this post.
> >
> > Regards.
> >
> > Alain Bourcier
> >
> >
>
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