Currently Being ModeratedFeb 2, 2013 11:02 PM (in response to bubbamj)
A RAID on the internal ports is a software RAID.
It shouldn't slow the machine but increases the requirement for a reliable, external backup.
In a Quad, some test results:
The drives used are old, out of production, but WD 2TB Blacks or RE, WD VelociRaptors, Hitachi 2TB 7K would make excellent candidates.
Some SATA rev. 2 SSD drives would also be fast.
The internal bus is the choke point for all these fast drives.
Use of a port multiplier PCIe controller card to an external housing array is the fastest hardware RAID for a G5.
The following tests are done in a Mac Pro, but the controller and housing can be used with a dual core G5.
You'll get the idea:
Currently Being ModeratedFeb 2, 2013 11:27 PM (in response to japamac)
FYI... for the OP,
But the OP must understand that a RAID 0 or striped RAID is volatle. Should one of his hard disks fail, he will LOSE all information as the two like drives are linked as one. This has happened to a friend of mine and the results were CATASTROPHIC at best.. I had to help him for 3 hours recover all his stuff from memory of what he remembered..
I warned him to make a backup of his system.. but he failed to do so. That is the ONLY drawback with a RAID 0. While yes, it will increase speed and performance of your system, there is a risk of hard drive failure down the road. Plan a backup accordingly should you have any issues with your RAID system.
PS: Techtool Pro, and Smart Utility + Disk Utility and others will report to you failing hard drives.
Currently Being ModeratedFeb 2, 2013 11:52 PM (in response to bubbamj)
Sorry, my mistake.. if you use Disk Utility to create the RAID 0, this is a software raid.. versus if you had a RAID card in your G5 that would be a hardware RAID.
The MDD G4 has an IDE bus, so of course its going to be much slower.. Unless you get a PCI SATA card.. The good news here is that the G5 Quad's SATA ports are SATA I specs.. meaning they go as high as 150 gigabits per second.. SATA II goes up to 3 GB/S, and SATA III is a whopping 6GB/S.. To obtain these high speeds would require an SSD drive.
A RAID 0 is going to feel almost as fast as an SSD. The G5's SATA I ports are independent of each other, so no slow down would occur.
Currently Being ModeratedFeb 4, 2013 8:45 PM (in response to bubbamj)
Would I need a PCI SATA RAID card to be able to benefit from RAID 0 in 10.5?
Definitely the IDE/PATA drives in a G4 MDD would need a PCI RAID card, but even the hardware cards do not RAID 0 a pair of drives on the same cable. (I don't think a single ribbon cable can communicate to both drives simultaneously. Software RAID0 of 2 IDE drives on the same cable may theoretically cut your speed in half.) So, even the hardware RAID 0 pair must consist of Master-Master pair or Slave-Slave pair, each drive on their own cable. Benchmarks of harware PCI ATA133 RAID 0 are just about in the ball-park of a single-drive SATA anyway.