could someone explain to me what exactly a raid setup is?-Jonas On 3/25/09, nestamicky <[email protected]> wrote: > > > > Mel wrote: > > Precisely as regards putting those SCSI drives in their own external > case, with their own power supply. You can daisy chain them with a terminal > at the end of the chain and the original connection to the "UL3D or UL4D" or > maybe a UL2D which should also work. > > Mel > > --- On *Wed, 3/25/09, dc <[email protected]> <[email protected]>* wrote: > > > From: dc <[email protected]> <[email protected]> > Subject: Re: Multiple HDs in Sawtooth > To: "G3-5 List" <[email protected]> <[email protected]> > Date: Wednesday, March 25, 2009, 4:53 AM > > > You didn't say, but putting in 3 drives I'm guessing you are thinking > of a RAID setup? > I have a single 15K/15MB cache SCSI hard drive in a Sawtooth. Using a > fast drive with a big cache gives a very nice R/W speed without going > to multiple RAID drives. The big advantages are: > 1) Less heat- fast SCSI drives get really hot and the case design of > the Sawtooth isn't that great for venting heat from the OEM hard drive > sleds. I put my drive on a cooler and mounted it on top of the optical > drive, where the PSU fan can pull the heat straight out. You don't > need Apple OEM gear, just buy a good quality LVD SCSI cable with an > active terminator. > 2) In a RAID 0 setup if you lose any one of your drives you lose the > whole system. And if you try to cram 3 or 4 hard drives into a > Sawtooth the odds are good that the heat will kill one of them. I had > two 15K drives running as RAID 0 in a Digital Audio and, despite each > have an additional fan, one went bad. I think it was still running too > hot. Now with just a single SCSI drive it's been running reliably and > I barely notice any real-world performance difference in the R/W > speed. > If you want to run 3 fast SCSI drives it might be better to use a card > with good external ports, like a UL3D or UL4D, and put them in an > external housing. The drives and the Sawtooth will run a lot cooler. > > On Mar 24, 6:08 pm, nestamicky > <[email protected]<http://mc/[email protected]>> > wrote: > > Hurray...I'm going SCSI's on my Sawtooth...well, as soon as I get the > > help I need. I'm trying to figure out how to safely install more than a > > single HD in the Sawtooth. Ideas...someone here must have done it. This > > is a physical issue, of course I know how to hook them up...but where > > would I physically place 3 SCSIs and maybe an ATA as well. Is this > possible? > > Thanks a lot! > > > I had not thought about putting the HDs into an external case, but > would have to now. I was not thinking of a RAID setup, but may do so. I have > the SCSI card and cable bought together from someone who had the lot in a > Sawtooth, along with the same drive. I was not thinking about HDs getting > hot, but that's a real concern. I'd hate for these SCSI HDs to go bad. > > > > > > >
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