[mythtv-users] Network storage fault tolerance (was Re: Myth autoexpiring brand new shows)

Matt Mossholder matt at mossholder.com
Tue Aug 26 22:31:13 UTC 2008

----- "Michael T. Dean" <mtdean at thirdcontact.com> wrote:

> Speaking of which, does anyone know of a way to make NFS tolerant of
> the 
> NFS server's going down so that it will automatically unmount/remount
> the filesystems?
> Mike

You might want to take a look at NFS v4, which allows you to stripe/mirror data across servers, 
rather than sticking to just a single server. Also referred to as pNFS.

Copied from a SNIA powerpoint:

  pNFS allows servers to stripe data of regular
  files across multiple storage devices

 A pNFS server consists of:
   – A metadata server (MDS) that implements the
      full NFSv4.1 protocol
   – One or more storage devices

 A pNFS client is an NFSv4.1 client that is
  prepared to directly access storage devices

 The pNFS client finds out about storage devices
  from the MDS via a new LAYOUTGET operation

  LAYOUTGET returns a layout that describes the
  striping pattern for a given file

 layouts are recallable which allows pNFS
  servers to re-stripe a file if desired or necessary

 striping patterns can indicate if a some or all of a
  pattern has mirrors
   – clients are not required to construct mirrors
   – Thus pNFS offers RAID 0 and RAID 1+0



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