Just to add some salt to the original posters question, I'm going to migrate
clustermembers into domU's on one big machine.
Well, it's not a full featered HA cluster, it consists of one huge nfs/nis
server and a lot of diskless servers with as little as necessary failover
First tests showed, that booting one of the machines as domU results in
random disk throughput of about 10 MB/s against about 80-95MB/s when running
I don't necessarilly need to keep the current infrastructure, but I'll
need one mountpoint available on many (expandable) machines.
Is there some best-practice description on how to get one mountpoint available
a lot of domU's ?
Thanks for any suggestion!
Mark Williamson schrieb:
>> I would like to learn the speed of the network bridge interfaces created by
>> More specifically, on xenbr0, given that the traffic only occurs between my
>> Dom0 host and PV DomU guest, am I limited to 10 Mbps, 100 Mbps or 1000
>> Mbps? Does it depend on something such as ethernet card capability (even
>> though the packets don't go out of the card and stay inside Dom0)?
> It's not limited by your physical ethernet card, nor is it restricted to any
> particular maximum. It's basically limited by how fast the Xen virtual
> network drivers and the Linux bridging code can move the data around. This
> used to actually be slower a domU accessing the physical ethernet due to the
> extra memory operations that were required (and used a fair bit of CPU). I
> think there have been some changes to reduce the bottleneck and improve
> intrahost performance since then, so it would be faster than I remember it.
> I'm not sure if it's currently faster than GigE; possibly.
> It ought to be significantly faster than 100Mbps on a modern machine. It'll
> act like a really fast ethernet card, with no hard limit on the transmission
> speed (instead, transmission speed will be limited by how powerful your
> machine is and how efficient the virtual ethernet code is).
>> I plan to use iScsi or Ata-over-Ethernet, that's why I'm asking this
> Is that from dom0 to domU? Do you have a particular reason for doing that?
> Using blkback / blkfront would be simpler and more efficient.
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