So what are the best drives and cards for scsi? Am I able to find larger drives in scsi? Seems as though, looking at the Mac swap list that,sadly, that a used option would be as expensive as a new one? Ne deals ne one?
Sent from my iPhone 4 On Nov 15, 2011, at 10:45 AM, "David W. Morris" <bbh...@gmail.com> wrote: > I think that the advantage of using SCSI drives is not only in the transfer > speed, which as you say is equal to one of your newer IDE drives, but IDE > uses more CPU DMA to run than using SCSI which frees the CPU up from managing > the data transfer. I don't know all the details as I am not a technical guy > (not too much anyway), but when faced with limited CPU power, SCSI drives > will always be better than IDE from what I have read in the past. > > This will speed up your G4 PowerMac, as it will have more CPU resources to > work on other tasks, instead of using a chunk of it's power to transfer data > over the IDE bus. > > I have several ATTO fibre optic controller cards pulled from Avid Meridian > audio/video editing MDD G4 systems, if anyone is interested in getting one. > I think the max transfer speed for them is faster than your 80MB/s, but then > you need a hard drive or adapter that converts drives to fibre optic, which I > am unfamiliar with, as the editing systems did not come with the storage > drives that the fibre optic cards connected to. > > Not sure how you are going to test the speed improvement you can get from > using SCSI drives instead of IDE, when both drives are transferring data at > the same speed, but as I said above, your G4(s) should have much more > resources available when using SCSI than IDE. > > > On Nov 15, 2011, at 7:21 AM, Bruce Godfrey wrote: > >> dc, do you have any data on how much difference a fast SCSI drive makes in a >> MDD or similar G$ Mac? I just installed one and I have used Disk Speed >> Bench X to test the transfer speed. I find 80MB/sec. My original IDE >> Hitachi Deskstar on the ATA100 bus is only moving about 50MB/sec. However, >> another WD drive on the same ATA 100 bus is also moving 80MB/sec. >> I was hoping the 15K U320 SCSI drive would easily beat a good IDE drive, but >> that does not appear to be the case. Is it maybe the kind of test Disk >> Speed Bench X performs? >> >> Another related point - AFAIK the fastest SCSI card made for a PCI slot is >> U160. The U320 cards are all PCI-X or later. Those work in a PCI slot, but >> only at 33MHz and 32 bits. The PCI SCSI cards, at least the ones from ATTO >> Tech, actually use the 64 bit wide PCI bus in old Macs. Maybe the only PCI >> cards made that do. >> >> Bruce > > -- > You received this message because you are a member of G-Group, a group for > those using G3, G4, and G5 desktop Macs - with a particular focus on Power > Macs. > The list FAQ is at http://lowendmac.com/lists/g-list.shtml and our netiquette > guide is at http://www.lowendmac.com/lists/netiquette.shtml > To post to this group, send email to g3-5-list@googlegroups.com > For more options, visit this group at http://groups.google.com/group/g3-5-list -- You received this message because you are a member of G-Group, a group for those using G3, G4, and G5 desktop Macs - with a particular focus on Power Macs. The list FAQ is at http://lowendmac.com/lists/g-list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to g3-5-list@googlegroups.com For more options, visit this group at http://groups.google.com/group/g3-5-list
