Ok, time to veer this another direction (grin). When RAID controllers are writing to the drives, are they doing it in any standard fashion? For example, if I buy a Mylex Acceleraid 150, and in five years it burns out, will I need a Mylex Acceleraid 150 to read the data from the drives? Kent Nick.T.Reinking at supervalu.com wrote: > > Ahh, coolness. > > In response to CPU Util, recently, IDE drives have had > lower CPU util than SCSI (because of DMA). It's mostly > a driver issue, and the amount of CPU util is just a few > percent, anyways. > > However, software RAID will seriously hurt your CPU Util. > The Escalade does the IDE RAID in hardware, so it only > uses a few percent of CPU to do your RAIDness. > > Nick > > jasonj at innominatus.com, on 10/17/2000 02:37:10 PM > To: tclug-list at mn-linux.org @ PMDF > cc: > Subject: Re: [TCLUG:22757] Raid and other storage stories > > No, RAID 10 is striped parity information. Similar to RAID 5 that has a > dedicated > drive for parity informaiton. RAID 10 stripes the parity across all drives. If > one > drive fails, the replacement drive is rebuilt with the parity info from the > other > drives. I think there is more performance than RAID 5. > 0+1 is not 10. 0+1 is 2 drives striped, and 2 more mirroring the stripe. > > Nick.T.Reinking at supervalu.com wrote: > > > RAID 10 == RAID 0+1. > > > > The difference is that the Escalade does it in hardware, > > whereas the FastTrack and HighPoint do it in software. > > > > Nick > > > > jasonj at innominatus.com, on 10/17/2000 01:53:33 PM > > To: tclug-list at mn-linux.org @ PMDF > > cc: > > Subject: Re: [TCLUG:22757] Raid and other storage stories > > > > Escalada 6xxx does RAID 0, 1, and 10 > > > > Fasttrak does 0, 1, and 0+1 > > Highpoint does 0, 1, and 0+1 > > > > Nick.T.Reinking at supervalu.com wrote: > > > > > Try www.elinux.com or www.thelinuxstore.com. > > > > > > Also, you don't need ATA/100 at all with just one device. > > > > > > As cool and fast as those 75GXPs are, they're not going to top > > > more than 40MB/sec. Easily under 66MB/sec. > > > > > > AFAIK, you can do all the weird partitioning that you could do > > > with a real SCSI RAID controller. The only bad thing about them > > > is that they don't support RAID 5. Only RAID 0,1, and 0+1, and > > > JBOD, I think. > > > > > > Nick Reinking > > > > > > dopp at acm.cs.umn.edu, on 10/17/2000 01:14:41 PM > > > To: tclug-list at mn-linux.org @ PMDF > > > cc: > > > Subject: Re: [TCLUG:22757] Raid and other storage stories > > > > > > On Tue, Oct 17, 2000 at 12:54:46PM -0500, Nick.T.Reinking at supervalu.com > wrote: > > > > The Escalade 6xxx series support ATA/66. > > > > > > Well, maybe they have an ATA/100 version planned... > > > > > > > > > > > They're really cool... > > > > > > They look cool... > > > > > > > > > > > 2-8 channels, 1 device/channel (which is why ATA/66 is > > > > plenty good). It's completely internal. > > > > > > Internal is good. I have a full tower, so I'll have the room. > > > > > > > > > > > The 3ware driver makes any RAIDed drives look like a single > > > > SCSI drive. > > > > > > > > Furthermore, the 3ware supports other cool things such as > > > > command queueing, etc. Plus, they have an onboard co-processor. > > > > (same one most SCSI RAID cards have). > > > > > > How about logical partitioning? Does the Escalade allow me to make, say, 4 > > > drives into a single logical drive and then partition that logical drive > > > into say, 3 logical partitions which all appear as seperate drives to my > > > machine? > > > > > > The reason I ask is because I was thinking about the following setup: > > > > > > 4 30GB ATA/100 Deskstars > > > 1 logical drive > > > 2 logical partitions > > > > > > I suppose I could just take the 1 logical drive and partition it through > > > the OS, but if the controller handles it for me, it's that much nicer. > > > > > > > > > > > The FastTrack card is both poorly supported, plus it doesn't > > > > have a co-processor. All it does for you is make your RAID > > > > drives look like one drive. It's still all software otherwise. > > > > > > Ah, thanks for the heads-up. > > > > > > > > > > > >From what I've heard, these cards are pretty amazingly fast. > > > > IDE is faster than SCSI for one device, since the command > > > > set is much smaller (and faster). Since there is only one device/channel > > > > on this controller... well, it's pretty amazing. Plus, it has an > > > > Alan Cox approved open source driver in 2.2.15+. > > > > > > > > > > Eenteresteeng... I'll have to give it a try. Where do you suggest I get > > > one of these controllers? It looks like one can only buy them through > > > offical 3ware resellers. > > > > > > Gabe > > > -- > > > > > > -------------------------------------------------------------------------------- > > > Gabe Turner | X-President, > > > UNIX Systems Administrator, | Assoc. for Computing > > Machinery > > > U of M Supercomputing Institute for | Univerisity of Minnesota > > > Digital Simulation and Advanced Computation | dopp at acm.cs.umn.edu > > > > > > "Dear Dr. Stupid: Why do I have to go to school?" -- Announcer > > > "Your parents are aliens!! While you're at school, they shed their > > > human skins and breathe dryer lint!!" > > > - Dr. Stupid in "Ask Dr. Stupid" > > > > > > -------------------------------------------------------------------------------- > > > > > > --------------------------------------------------------------------- > > > To unsubscribe, e-mail: tclug-list-unsubscribe at mn-linux.org > > > For additional commands, e-mail: tclug-list-help at mn-linux.org > > > > > > ------------------------------------------------------------------------ > > > --------------------------------------------------------------------- > > > To unsubscribe, e-mail: tclug-list-unsubscribe at mn-linux.org > > > For additional commands, e-mail: tclug-list-help at mn-linux.org > > > > --------------------------------------------------------------------- > > To unsubscribe, e-mail: tclug-list-unsubscribe at mn-linux.org > > For additional commands, e-mail: tclug-list-help at mn-linux.org > > > > ------------------------------------------------------------------------ > > --------------------------------------------------------------------- > > To unsubscribe, e-mail: tclug-list-unsubscribe at mn-linux.org > > For additional commands, e-mail: tclug-list-help at mn-linux.org > > --------------------------------------------------------------------- > To unsubscribe, e-mail: tclug-list-unsubscribe at mn-linux.org > For additional commands, e-mail: tclug-list-help at mn-linux.org > > ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- > --------------------------------------------------------------------- > To unsubscribe, e-mail: tclug-list-unsubscribe at mn-linux.org > For additional commands, e-mail: tclug-list-help at mn-linux.org -- Kent Schumacher Structural Wood Corporation 4000 Labore Rd. St. Paul, MN 55110 Phone: (651) 426-8111 Fax: (651) 426-6859 e-mail: kent at structural-wood.com --------------------------------------------------------------------- To unsubscribe, e-mail: tclug-list-unsubscribe at mn-linux.org For additional commands, e-mail: tclug-list-help at mn-linux.org