[AusNOG] Back of envelope II

[Skeeve Stevens]

The ONLY solid way that I know to do good server redundancy is with Virtual Platforms that support SAN, Fibre Channel/iSCSI with diverse heads.

We manage multiple instances of VMware ESX/ESXi that have 2+ heads backed into SAN's with both heads fed into Cisco switches - nearly always 3560G/3750G-stacked configurations.

Those have never gone down, even when upgrading the physical hardware - VM's just migrate between heads.

Some say VM's aren't appropriate for some applications... I would debate that as even in a dedicated VM solution there is not many apps that wouldn't happily work with that given dedicated NIC, Storage, CPU and RAM access.

...Skeeve

--
Skeeve Stevens, CEO/Technical Director
eintellego Pty Ltd - The Networking Specialists
skeeve at eintellego.net / www.eintellego.net
Phone: 1300 753 383, Fax: (+612) 8572 9954
Cell +61 (0)414 753 383 / skype://skeeve
--
NOC, NOC, who's there?

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> -----Original Message-----
> From: ausnog-bounces at lists.ausnog.net [mailto:ausnog-
> bounces at lists.ausnog.net] On Behalf Of Michael Bethune
> Sent: Friday, 6 March 2009 12:14 PM
> To: ausnog at ausnog.net
> Subject: [AusNOG] Back of envelope II
>
> Thanks folks for all the responses.
>
> Is it possible to do auto fail over redundant switching and what if
> anything
> in the Cisco range would do it?
>
> I remember using a dual cisco catalyst, but you ended up with a pair of
> tails, 1 from each catalyst, with a heart beat connecting the two
> catalysts
> together. Has the state moved on to allow you to have transparent (to
> the
> connected hosts) redundant switching?
>
> Michael.
>
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