On 04/14/2010 02:56 PM, Paul Davis wrote: > On Wed, Apr 14, 2010 at 12:23 AM, Rick Green <rtg@xxxxxxxxx> wrote: > >> Last weekend, I was running FOH for a couple of concerts, and the artist >> had hired a professional recording engineer to lay down a multitrack of >> the show for possible commercial release. THey had a few 'special >> surprise guests' showing up, so I kept bringging out 'just one more' >> microphone until the channel count was up to 22, I think. After sound >> check, the recording engineer expressed some trepidation that his >> external hard drive could handle all that bandwidth. I asked him if he >> had pushed record and tried it during soundcheck, and he said "Of course, >> but you know when they get excited and start playing loud during the show, >> it fills up those bits pretty quick, and maybe then the firewire800 won't >> be fast enough." > > good story. > > what's ironic though is that its now reasonably well documented that > if the disk drive is in the line of fire when they start to play loud, > it really will be unable to keep up. this has nothing to do with bit > rates, but is (probably) caused by the the vibrations causing read > failures which necessitate a lot of retrys, thus slowing down the > effective streaming bandwidth of the disk. if the disk is kept out the > way of direct incoming sound, the issue goes away. MA lighting (the guys who sell the grand ma range of light controllers, market leaders in germany) have a warning note on their boxen (which are embedded pcs in effect) not to attempt disk backups in high-noise conditions, because the vibrations can cause failure or even data corruption. very funny. even more funny: they're right. i've heard quite a few lighting engineers got bitten by this issue. _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
