I use 4 IDE drives on the motherboard's (2) IDE controllers. Using them as a stripe set in their master-slave configuration is fine, even for my VideoToaster which does uncompressed D1 NTSC/PAL video. I don't quite think it is as fast as 60 MB/s, but if I remember right the test utility reported an average of ~52 MB/s... until about 40% of drives were used then it quickly dropped down to ~26-22 MB/s. I'm still wondering how USB 2.0 would do... yes it'd be a permanent connection, and cheaper than SCSI, and possibly cheaper than SATA, especially since I have no open PCI slots, but available USB 2.0 ports.
----- Original Message ----- From: Brad Templeton <[EMAIL PROTECTED]> Date: Monday, March 21, 2005 3:37 pm Subject: Re: [mythtv-users] OT: 160 gig WD - $40 > On Mon, Mar 21, 2005 at 07:18:07AM -0500, Jeff wrote: > > With IDE you only want one drive on a cable (controller > > port) as only one drive can transfer data at a time. You can > > get a 2nd IDE controller card (better to get a S/ATA card perhaps > > at this point) and run 3 HD's using the 4th channel for your CD/DVD > > drive. Best to get the largest disks you can (but look for 3yr > > warranties which tend to be more expensive). > > What do benchmarks say about this? Current systems and drives > come with > 100 megabyte/second or 133 megabyte/second ATA bus speeds. The 7200 > rpm drives, on the other hand, tend not to be able to sustain data > rates more than about 60 megabytes/second, and of course rarely > are they > actually doing this, they spend most of their time seeking or idle. > > So, is it really true that you only want one drive on the cable? Are > there some benchmarks out there showing the throughput for the 2 on > one cable vs. 2 on 2 cables? I am sure there is some loss here, but > how much is it? > > As you probably know, MythTV tends to rarely need more than 2 > megabytes/secondof disk bandwidth to play or record even an HD > stream. This is so far below > the capacity of these channels that it seems odd to me if there would > be much gained by buying additional disk controllers to squeeze out > a little more bandwidth, but I am curious as to the numbers you > may have. >
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