[Lustre-discuss] Failover & recovery issues / questions

[Jeffrey Bennett]

Thanks,

I think this and Adam's explanation make perfect sense. I was confused by the description on the manual, in particular by this sentence "With failover, two OSSs provide the same service to the Lustre network in parallel" under the section "Active/Active Failover Configuration". I think "in parallel" led me to think they were mounted at the same time. My fault for not trying it :)

jab  

> -----Original Message-----
> From: lustre-discuss-bounces at lists.lustre.org 
> [mailto:lustre-discuss-bounces at lists.lustre.org] On Behalf Of 
> Brian J. Murrell
> Sent: Monday, March 30, 2009 6:17 PM
> To: lustre-discuss at lists.lustre.org
> Subject: Re: [Lustre-discuss] Failover & recovery issues / questions
> 
> On Mon, 2009-03-30 at 17:52 -0700, Jeffrey Bennett wrote:
> > Thanks Kevin for clearing this up.
> > 
> > So when the manual mentions "Load-balanced Active/Active 
> configuration", what does that mean?
> 
> It simply means out of all of the OSTs that both machines can 
> see/use, you mount 50% of them on one machine and the other 
> 50% on the other with the capability of one machine taking 
> 100% of them should it's partner die.
> 
> > I have never tried it, but I expected it to be different 
> from the "Active/Passive" configuration on the MDS.
> 
> I suppose you could call an MDS active/active if you had two 
> filesystems, and therefore two MDTs and you mounted each one 
> active on each machine.  But we typically talk in terms of a 
> single filesystem, hence the active/passive nomenclature.
> 
> b.
> 
>