[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
===========================
--Matt
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