What is the application? Web, DB, Mail some combination?
How much space is it going to need? Basically with RAID 10 you double the number of drives you need than with RAID 5. If you are dealing with only 4 drives, then I'd still go with RAID 5. However if you are talking 8+ then go with RAID 10. Are you going to use internal disks or SCSI attached disks. Don't forget about heat. The more drives you have the hotter it gets, which WILL cause problems if they are not properly cooled. > -----Original Message----- > From: Dana [mailto:[EMAIL PROTECTED] > Sent: Friday, August 04, 2006 11:57 PM > To: CF-Community > Subject: Re: RAID Help > > cost is a little bit important but not as much as throughput. > > Thanks > > On 8/4/06, Nick McClure <[EMAIL PROTECTED]> wrote: > > > > 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. > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| 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:212646 Subscription: http://www.houseoffusion.com/groups/CF-Community/subscribe.cfm Unsubscribe: http://www.houseoffusion.com/cf_lists/unsubscribe.cfm?user=89.70.5
