[mythtv-users] Storage on SAN
redcane at redcane.homelinux.org
Wed Aug 2 09:21:38 UTC 2006
On Wednesday 02 August 2006 19:12, Damien Whyte wrote:
> I have a diskless frontend/slave backend that stores recordings on a a
> master backend via NFS (as well as it's root partition). Initially I had
> poor performance writing to the NFS disk which made capture from the
> diskless machine's DVB card problematic.
> Initially I was getting a write speed over NFS of somewhere in the order
> of 200 kilobytes/s. This was clearly inadequate. Once I tracked down the
> problems in my NFS configuration however the situation improved greatly.
> From memory now I'm getting approximately 8 megabytes/s writes over 100
> megabit LAN, and around 36 megabytes/s over gigabit. So even the
> bandwidth of a 100 megabit LAN is comfortably enough to have multiple
> simultaneous streams being dumped to or read from a file server.
I'm considering a similar setup, but I've found my NFS performance at this
point to be a little lacking. (I get about 5MB/s). But my "server" is only a
1Ghz celeron, although it gets decent disk performance locally (Up to 15MB/s
sustained writes)... I don't know if the CPU is a bottleneck, or if something
else is the problem.
I am also considering putting the TV card into the "server" (mainly for power
savings, so I don't have to have the server and the mythbox running 24/7),
and the read speed should be adequate, but any NFS optimisations would help.
How did you increase your NFS performance?
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