[ZODB-Dev] zeo 2 availability, plans?

[sean.upton@uniontrib.com]

ZEO2 alone really does nothing in the replication department, as far as I
understand it.  If you want replication of the ZSS to create
high-availability, here' my understanding of your available options: you
either want to use something like a low-level network-block-device
mechanism, rsync, OracleStorage (and use Oracle to replicate), Zope Corp's
Zope Replication Server (a Commercial offering, a.k.a. Standby Storage), or
give Toby's Directory storage a try (which has snapshot capabilities for
backup; in theory, find+cpio over NFS as part of a shell script might do the
trick for incremental backups mimicing replication).

Sean

-----Original Message-----
From: Mark McEahern [mailto:mark@mceahern.com]
Sent: Thursday, August 29, 2002 2:38 PM
To: zodb-dev@zope.org
Subject: [ZODB-Dev] zeo 2 availability, plans?


Hi, we're currently planning a consulting project for a customer using Zope
and we'd like to use ZEO.  I understand that scaling the ZSS (Zope Storage
Server) is part of the second phase of ZEO2 development:

<quote>
Doesn't this just move the point of failure somewhere else?
Yes, the Zope Storage Server then becomes a single point of failure. The
next stage of ZEO will be to replicate the ZSS piece.

However, since the role of the ZSS is so limited, the chance that it can
fail are vastly diminished. Namely, the ZSS doesn't run any Zope
applications, it just serves object data. If there is an application that
gets hung or crashes, this won't affect the ZSS from functioning. Most of
the classic bugs and problems for application servers will be eliminated.
</quote>

Source:  http://www.zope.org/Products/ZEO/ZEOFAQ

I couldn't find a timetable for this development.  I'm curious whether there
is one.  Is anyone using the latest development version 2.0b1?  I'm just
trying to get a sense of whether I should stick with 1.0 and plan to upgrade
or whether I should play with 2.0b1 because 2.0 final is around the corner?

Thanks,

// mark

-


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