Re: [Xen-users] Network based storage - NBD/AoE/iSCSI other?

[Tom Mornini <tmornini@xxxxxxxxxxxxxx>]

On Oct 2, 2006, at 10:39 AM, Luke Crawford wrote:

> On Mon, 2 Oct 2006, Tom Mornini wrote:
> > > > the Coraid's 15-drive box is just a P4 SuperMicro mainboard,  
> > > > with two
> > > > SuperMicro 8-port SATA cards on a 3U SuperMicro case, and an IDE  
> > > > flashdrive
> > > > with Plan9 OS and its own software.  nothing hard to replicate...
> > > And their performance numbers are relatively terrible, so you  
> > > should be
> > > able to do much better by building it on your own.  (Unless the bad
> > > performance numbers are due to AoE itself, which I somewhat  
> > > doubt, but
> > > regardless, I was able to do about 30% better with iSCSI.)
> > In terms of what? We're getting a very high IOPS rate, and nearly  
> > saturating gigabit ethernet.
> write-through or write-back cache?  lots of systems default to  
> write-back, as the performance will be worlds better with write- 
> back, at the expence of safety.
The Coraids are write through, i.e. the write returns when it's  
committed to disk.
--
-- Tom Mornini


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