[oracle-l] is this a failover - or ....
- From: "Markus Reger" <Reger@xxxxxxxxx>
- To: < <oracle-l@xxxxxxxxxxxxx>>
- Date: Tue, 27 Jan 2004 17:45:35 +0100
we have - amongst others - 2 sun fire v240, each has fibre channel =
adapters and is connected to a storage system. a storage system is a =
system, that makes the connected machine(s) - if correctly configured - =
believe, that there is one ( or more ) additional scsi drive(s), that can =
be treated like physically built in device(s). in this document i'll call =
it vdisk (like HP does).
<gggg>
(in case you all know it: forgiveness for beeing smart allecky)=20
<gggg>
tricky: both of the 2 sun-v-240 can mount both devices, so - in a =
completely stupid and unusable case - both machines have both devices =
mounted in rw. never considered this as a seriously working configuration. =
*BUT* if one sun-v-240 is down, the other one can mount it in rw and use =
it. this is a working - and not stupid - situation. (admitted: the =
sun-v-240 is not likely to be down, but just for the sake of this now let =
us assume) =20
consider the scenario described the paragraph before. and now consider =
there is an (identical) oracle installation on both machines, correctly =
designed (pathes, sysmlinks...), so that both machines can - mutually =
exclusively - mount the device and start the oracle machine (instance) and =
mount and open ... the database(s). it works. listeners can be configured. =
works too.=20
can this be considered a failover scenario???=20
did I possibly overlook some nasty detail???
any input appreciated. (... even rebukes)
assumed: the storage area network (2TB) never really fails - raid 5, .... =
and so forth.
kr MR
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