[mythtv-users] WAY OT: Storage designs

Greg Oliver oliver.greg at gmail.com
Tue Aug 31 00:06:00 UTC 2010


On Mon, Aug 30, 2010 at 6:55 PM, Scott <scott at frak.ms> wrote:
>
> On Aug 30, 2010, at 6:25 PM, David Scammell wrote:
>> iSCSI:
>> no performance figures, i'm sorry, in my tests about a couple of years
>> ago NFSv3 vs. iscsi, iscsi won hands down.
>
> I'm not to shocked to hear this. But for a home server, is it really needed? I went the other direction and setup a Linux NAS serving data over both AFP (Time Machine backups and general Apple file sharing storage) and NFSv3 (MythTV BE storage for ISOs). To keep heat and noise down I decided on using only 5400 RPM drives. I configured 8 of them in a RAID6 array.
>
> From the MythTV BE a single threaded write over NFS  to the array from /dev/zero gives me an average 88MB/s. A single threaded read over NFS from the array gives me 30MB/s oddly enough. I mention it's odd because a single threaded file read over AFP of the same file shows 75MB/s from the array. Clearly something is not optimal in my Linux MythTV BE NFS read performance. Still, 30MB/s read and 88MB/s write is easily good enough for streams.

Yep - the comms between BE/FE ar eonly dictated by the stream..
Unfortunately, I am attemptimg the "whole home solution"..  Like I
said, teh NFSroot I already have going is acceptable for mythtv..  I
specified OT because I need (or would really like) some rsync
performance....


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