Well, there are other things to take into account. Like the controller, and what you are doing. The generic text book answer is if there is not cost constraint go with 10. However that is dealing with internal or direct attach SCSI systems. Realistically there are channel constraints, and controller issues that also affect the speed.
For instance, say you have 6 disks attached to one controller, 3 on one channel and 3 on the other. RAID 5 would provide good speed and more space because the load is being distributed. Even better, say you have two controllers and 6 disks, and your controllers could communicate, and you take all 6 disks and put them in one RAID 5 array, then you are doing very good. At that point I'd say you'd get the best of both worlds. Add in good caching and you can do very good. Of course if cost is no object, get 12 disks, and do RAID 10. Here we don't use internal disks for anything that is IO intensive, also we do a lot of clustering for big stuff. We have a SAN setup using fiber channel to connect to the individual servers, using high quality fiber attached SCSI drives. I can go into more detail if you want, but basically, I have an application that runs on 4 web servers, connecting to a back end MSSQL cluster. The app serves some 50 page views a second, with each page view averaging 20-30 queries, and the disk queue length on the SQL Server maintains at zero. > -----Original Message----- > From: Dana [mailto:[EMAIL PROTECTED] > Sent: Friday, August 04, 2006 11:42 PM > To: CF-Community > Subject: Re: RAID Help > > so if throughput is higher priority than the cost of two drives, and you > are > starting from scratch, you owuld want to go 10, right? Leastwise that's > what > I just wrote up. > > On 8/4/06, Nick McClure <[EMAIL PROTECTED]> wrote: > > > > A little outdated, but still makes sense in most cases. > > > > Disk throughput is the major bottleneck of computing, no matter what you > > get for a processor, the disk controller and network controller will > > slow you down. > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| Introducing the Fusion Authority Quarterly Update. 80 pages of hard-hitting, up-to-date ColdFusion information by your peers, delivered to your door four times a year. http://www.fusionauthority.com/quarterly Archive: http://www.houseoffusion.com/groups/CF-Community/message.cfm/messageid:212644 Subscription: http://www.houseoffusion.com/groups/CF-Community/subscribe.cfm Unsubscribe: http://www.houseoffusion.com/cf_lists/unsubscribe.cfm?user=11502.10531.5
