Matt Wisdom wrote: >>> 10 drive raid >> >> Which controller? Chipset? Battery backup? RAM? > > Looking at an adaptec U320, 256 MB w/battery backup for 72 hours.
Cache size matters. See for instance the following tests with 128 vs 512 MB controller cache: http://www.tweakers.net/benchdb/testcombo/82 http://www.tweakers.net/benchdb/testcombo/197 If you can get more cache, it is probably worth it. >>>What RAID config would you use for the databases? >> >> Depends on what RAID controller you have. If it is IOP321 based, >> 10 disks in a RAID 6 or 9 disks in a RAID 5 and a hotspare. > > I didn't know what RAID 6 is -- "RAID-6. This type is similar to RAID-5 but > includes a second parity scheme that is distributed across different drives > and thus offers extremely high fault- and drive-failure tolerance. There are > few or no commercial examples currently." It is basically RAID 5 with 2 parities. In RAID 5 you can loose one disk without dataloss, in RAID 6 you can loose 2 disks. > So you would have only one data volume for the two databases? What about the > logs? All on the same volume. But remember the "If it is IOP321 based". Adaptec makes its own RAID XOR chips, and it looks like vendors buying their RAID XOR chips from Intel currently hold the performance crown, which is more important with RAID 5: http://www.tweakers.net/benchdb/test/80 >>> How important is (battery backed) write cache for the raid? >> >> It is the single most important way to improve performance on the >> hardware side. > > Sounds like this would be a hard limit on scalability for connections per > second because of the cfsessions client vars. Yes. That is why a battery backed cache is so important. Jochem ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| Protect Your PC from viruses, hackers, spam and more. Buy PC-cillin with Easy Installation & Support http://www.houseoffusion.com/banners/view.cfm?bannerid=61 Message: http://www.houseoffusion.com/lists.cfm/link=i:4:190651 Archives: http://www.houseoffusion.com/cf_lists/threads.cfm/4 Subscription: http://www.houseoffusion.com/lists.cfm/link=s:4 Unsubscribe: http://www.houseoffusion.com/cf_lists/unsubscribe.cfm?user=89.70.4 Donations & Support: http://www.houseoffusion.com/tiny.cfm/54
