[ale] School Project to Create Distributed Filesystem

[Omar Chanouha]

I appreciate all the ideas. I think the bottom line is that the
aggressive timeline we have been given, piggybacking over nfs it not
going to be possible. I think we will just write a short proof of
concept user space app that connects via our simplistic protocol, to
our simplistic protocol. Not as "noble" (I like that comment btw), but
when the professor wants the whole thing working well, 3 weeks before
the end of the semester, and this is only one of 5 classes, nobility
must take a back seat.

Thanks,

-OFosho, Miami Dolphin and Former NFS Kernel Hacker

On Tue, Feb 24, 2009 at 12:34 PM, Ed Cashin <ecashin at noserose.net> wrote:
> On Tue, Feb 24, 2009 at 11:57 AM, Greg Freemyer <greg.freemyer at gmail.com> wrote:
>> Just thought of another approach.
>>
>> Layer one = iSCSI or NBD to export raw block devices out of each server.
>>
>> Layer two = mdraid to create a fault tolerant block device. ie. use
>> Raid 10 or Raid 6 etc. to integrate the raw devices into a whole.
>>
>> Layer three = LinuxHA to control the whole mess.
>>
>> Then you just throw in a filesystem and NFS support and you're done.
>> LinuxHA already has filesystem and nfs control scripts I think.
>
> There's a HOWTO that might be interesting to folks who are
> considering this architecture.  It's directed towards a specific
> platform, but it is short and generalizes well, since the platform
> is based on debian lenny.
>
>  http://support.coraid.com/support/cln/ft/failover-kit.html
>
> The use of md isn't covered, but it's been tested with the
> configuration in the HOWTO and works fine as long as the
> admin understands clearly that heartbeat must control md
> just like it controls filesystem mounting.  Specifically, the
> standby must never have md running with its own independent
> ideas about the state of the Software RAID.
>
> --
>  Ed Cashin <ecashin at noserose.net>
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