> > My solution for the simple question of solution for playback was to > > have > > installed an ATTO UL4D Ultra 320 card and a SCSI raid capable of > > reading 200+ MB/sec. > > Logic 6.3.3 is working pretty flawlessly, and the drives put out all > > the tracks I need without > > any hickups. It will loop a few bars of 90 tracks all day long. > > Hi Ivan, > > Thanks for this report! I think what it shows is very useful. It > suggests that while other applications may have more robust disk/cache > handling than Logic, it IS possible to get high track counts from > Logic, if willing to invest in extra hardware. Ideally, it shouldn't > be necessary to invest in extra hardware to use Logic at high track > counts if it is not necessary to invest in extra hardware to use > Cubase/Nuendo at high track counts, but it is good to know that it is > possible. > > Orren Orren and Ivan i've followed this discussion in and out, but i wanted to add that i have done extensive drive testing with logic and have never seen RAID improve performance. i've got a dual G5 and have tried every combination of drives from a RAID made up of 8 15K SCSI drives attached to an ATTO UL4d (4 drives per channel - read and write times around 270 MB/ sec) to a firewire 400 drive. and this is what i've seen: 1. RAID does not improve performance with logic. when using a RAID with logic, i've always gotten the same performance as using a single drive from that RAID. meaning, the 8 drive 15K SCSI RAID performed audio playback at the same level as a single 15K scsi drive. so if ivan is getting 90 looped tracks to playback from his RAID, my guess is he would get that exact same performance from 1 of the drives which make up the RAID. 2. Logic on X can not make use of multiple drives for playing back audio. well, i should say - it can playback audio from multiple drives, but it doesn't improve track count performance to do so. meaning - if you can play back 50 tracks from 1 drive and you add a second drive just like it, you will still only be able to playback 50 tracks (even if you split the tracks evenly across both drives). 3. if you think Logic playback performance is bad at 44.1, try it at 96K - it degrades dramatically at higher sample rates. and i'm not talking about being able to play 1/2 the tracks at 88.2 as 44.1 - i'm talking about being able to play about 30% of the tracks at 88.2 that you can at 44.1. 4. Logic exhibits the same lack of performance improvement when using multiple drives with the EXS for streaming samples - you can stream from multiple drives but it does not improve performance. meaning, i experience dropped data at the same point in songs whether streaming from 1 scsi drive (all instruments on 1 drive) or from 8 (with the instruments spread out across the 8 drives). for more info on some of my testing of various drive set-ups with 96K go here: http://community.sonikmatter.com/forums/index.php?showtopic=‰28&hl= for confirmation of another logic user who initially thought he was seeing improvement from a RAID only to test it and discover her wasn't, go here: http://discussions.info.apple.com/webx?14@46.SoRPaBRjAsO.0@.689d9169 anyway, just wanted to add my experience for anyone considering going the RAID route. in my experience, the best track count performance you can get from logic is with the single fastest drive. at the moment, that remains a 15K scsi drive. i really do hope that apple gets on the ball with this.