On 09/06/05, Matthew Nuzum ([EMAIL PROTECTED]) wrote: > On 6/9/05, Rory Campbell-Lange <[EMAIL PROTECTED]> wrote: > > Disks: > > > > I'm somewhat confused here. I've followed the various notes about SATA > > vs SCSI and it seems that SCSI is the way to go. On a four-slot 1U > > server, would one do a single RAID10 over 4 disks 10000rpm U320 disks? > > I would run the database in its own partition, separate from the rest of > > the OS, possible on LVM. An LSI-Megaraid-2 appears to be the card of > > choice.
> Can you tell us about your application? How much data will you have, > what is your ratio of reads to writes, how tollerant to data loss are > you? (for example, some people load their data in batches and if they > loose their data its no big deal, others would have heart failure if a > few transactions were lost) The application is a web-based prototype system for kids to make their own galleries based on content found in museums and galleries. They will link to content provided by curators, and be able to add in their own material, including movies, sounds and pictures. All the content, however, will be restricted in size. I also do not intend to store the movies, sounds or pictures in the database (although I have happily done the latter in the past). Up to the data will be uploaded from 3G handsets. The rest will be done on a per-user, per-pc basis through the web interface. The service is expected to be used by about 50000 users over 18 months. Of these around half will be content creators, so will account for say half a million rows in the main content table and under 2 million rows in the commentary table. The most used table will probably be a 'history' function required by the contract, tracking use through the site. I imagine this will account for something like 20 million rows (with very little data in them). The main tables will have something like 80% read, 20% write (thumb suck). The history table will be read by an automated process at 3 in the morning, to pick up some stats on how people are using the system. It wouldn't be a problem to very occasionally (once a month) lose a tiny piece of data (i.e a record). Losing any significant amounts of data is entirely out of the question. > If your application is 95% writes then people will suggest drastically > different hardware than if your application is 95% selects. > > Here is an example of one of my servers: > application is 95+% selects, has 15GB of data (counting indexes), low > tollerance for data loss, runs on a 1 GHz P3 Compaq server with > mirrored 35 GB IDE disks and 1.6GB of RAM. Application response time > is aproximately .1 second to serve a request on a moderately loaded > server. Yeah. Maybe the machine I'm speccing up is total overkill for this project? I'm just worried that if it is a big success, or if we have 400 kids pounding the server at once over high-speed school lines, the thing will grind to a halt. Thanks very much for your comments. Regards, Rory -- Rory Campbell-Lange <[EMAIL PROTECTED]> <www.campbell-lange.net> ---------------------------(end of broadcast)--------------------------- TIP 2: you can get off all lists at once with the unregister command (send "unregister YourEmailAddressHere" to [EMAIL PROTECTED])