[Lustre-discuss] How smart is Lustre?

[Jason Brooks]

Hey, thanks you guys!  I appreciate it a lot!

--jason


On Dec 20, 2012, at 12:11 PM, David Noriega wrote:

> In my experience, if there is a particular driver for multipathing from the vendor, go for that. In our setup, we have Oracle/Sun disk arrays and with the standard linux multipathing daemon, I would get lots of weird I/O errors. Turns out the disk arrays had picked their preferred path, but Linux was trying to talk to the LUNs on both paths and would only receive a response on the preferred one.
> 
> There is an rdac driver that can be installed. Simply disable the multipathing daemon or configure it to ignore the disk arrays and use the vendor solution. I had no more I/O errors(Which only served to slow down the boot up process).
> 
> 
> On Wed, Dec 19, 2012 at 11:36 AM, Jason Brooks <brookjas at ohsu.edu> wrote:
> Hello,
> 
> I am building a 2.3.x filesystem right now, and I am looking at setting up some active-active failover abilities to my oss's.  I have been looking at Dell's md3xxx arrays, as they have redundant controllers, and allow up to four hosts to connect to each controller.
> 
> I can see how linux multi-path can be used with redundant disk controllers.  I can even (slightly) understand how lustre fails over when an oss goes down.  
> 
> 	• Is lustre smart enough to use redundant paths, or failover oss's if an oss is congested?  (it would be cool, no?)
> 	• Does the linux multi-path module slow performance?
> 	• How much does a raid array such as the one listed above act as a bottleneck, say if I have as many volumes available on the raid controllers as there are oss hosts?  
> 	• Are there arrays similar to Dell's model that would work?
> Thanks!
> 
> --jason
> 
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