[Linux-ha-dev] Support, etc.
robin.tawab at apptime.com
Sun Nov 19 07:27:04 MST 2000
a commercial platformindependant clustering solution for linux, SUN, IBM, NT,
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The linux watchdog light license is free for educational and non commercial use.
> If you aren't able to find the right solution under Linux, and choose Sun,
> take their machines, but not Sun Cluster-HA. I'm working in a big french
> bank, where we manage about 70 sun Servers (E450 to E4500), and we have HA
> systems since years. We have tested, few years ago, Sun Cluster 2.1, on two
> nodes (E3500, with 2 A5000). After 2 weeks of hard work (with Sun enginneers
> on site), the system was not working correctly, and was not able to manage a
> correct failover. I finally decide to write my own HA system, because we
> haven't enough time to choose another product. This "home made" system works
> fine since two years, on 5 of our critical systems (30 minutes down ->
> 300.000 $ lost !).
> We also try Veritas Cluster Server, and this product is really better than
> the Sun product. There is some bugs, but it works fine. We have two of them,
> and one FirstWatch system (the older version of VCS).
> The main problem with these software is their complexity. You can make of a
> lot of things with them (especially with VCS), but, for me, reliability
> decrease when complexity grows. And for these type of software, you need a
> maximum reliability.
> We had, 5 year ago, a "dual-brain syndrone" on one of our Sequent cluster
> (each machine thought the other one was dead, and each one mount the same
> file-systems, launch the same Oracle database, take the same @IP, ....). And
> the result was a complete corruption of the datas, and a full restore of the
> databases ....
> If you're not absolutly sure of you HA system, you'd better keep the
> machines alone ....
> ----- Original Message -----
> From: Scanlan, Brian (5188) <Brian.Scanlan at DIGIFONE.COM>
> To: <linux-ha-dev at lists.tummy.com>
> Sent: Tuesday, November 14, 2000 3:40 PM
> Subject: [Linux-ha-dev] Support, etc.
> > Hi all.
> > I'm involved in a project which may end up needing the
> > deployment of a SSH server, and since this will be customer
> > facing and money will be lost if it blows up, it will need
> > to be in a HA failover setup.
> > Nothing special, just simple failover. I think we'll be
> > happy with a "stateless" failover. We're happy with the
> > capabilities of Linux as a production worthy OS (certainly
> > for running a simple service such as SSH). The hardware would
> > be something along the lines of a pair of totally overspecced
> > 2U Dell servers, ~800mhz CPUs, 128mb of RAM, hardware RAID, etc.
> > Money is not really the concern. We'd be happy with something like
> > Redhat's Cluster product. That said, we'd probably be as happy
> > with a Sun Cluster of Netra T1's running the same service, but
> > personally, I'd prefer to deploy Linux - Going for the SunCluster
> > is total overkill... Isn't it?
> > We try to do everything on first rate hardware and on really good
> > support, but I'm having problems sourcing the right support for
> > a Linux cluster.
> > We need something along these lines in support...
> > * 24x7 phone line. (Redhat have this in emergencys...)
> > * Escalation procedure.
> > * A dial-in service.
> > * Engineer on-site if software problem continues.
> > Realistically, if the dial-in service doesn't work, and it's
> > not a hardware problem, then chances are a engineer on-site
> > won't actually fix the problem, but hey - It's having clauses
> > in support contracts like this that gets clusters deployed in
> > a telco, not whether or not the Linux cluster is as technically
> > capable as a Sun cluster.
> > So, this mail ain't a technical one by any means - It's a plea
> > to anybody who's deployed HA Linux in a telco environment, and
> > anybody with ideas as to how to sell it, and where to get telco
> > grade service, and any other general advice!
> > I've been advised that this mail won't be off-topic, but
> > apologies if anybody takes offence to this mail being sent to
> > a developers list... Pointers to elsewhere where I might be
> > able to get this kind of help is much appreciated!
> > Thanks for your time, etc.
> > Brian.
> > Brian.
> > _______________________________________________________
> > Linux-HA-Dev: Linux-HA-Dev at lists.tummy.com
> > http://lists.tummy.com/mailman/listinfo/linux-ha-dev
> > Home Page: http://linux-ha.org/
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