Re: Machine Configuration

Enio Roncarati wrote: > > Hi everybody. > > We have a version 7.20 of Informix OnLine Dynamic Server on a DEC 2100 with > 3 CPUs, 1 GB of RAM and 60 GB of Storage Array. > > Everything is OK, but we want to find the best configuration for the disk > array. We have 2 disks array of 30 GB each, on 2 different controlers, each > one with 4 channels. Each array has 6 HZ40 from DIGITAL, that support bolth > raid level 3 and 5. > Probally, we will have much more "READS" than "WRITES". We know that there > is a big difference from raid level 3 and 5 when reading information from > a database, and in bolth cases the chunk size parameter is very important. Digitals' implementation of RAID is adaptive. The controller is intelligent, deciding on whether to optimize on i/o or bandwidth. Therefore, you probably won't be able to "outsmart" the hardware there. It's already a good implementation. > Does anybody have any experience on it. Witch configuration can be > experimented with these disks and controllers. > We are using LSM (Logical Storage Manager - from DIGITAL) to create the > logical devices (disks). > Of couser, this will slow down the performance, but it will improve the > flexibility. You must be using LSM for the spanning then? Since you have hardware RAID 3/5, you wouldn't want to use LSM for that. > Well, has anybody configured a system like this. Where and how can we find > some help. > We have a 2 CPU 4100 in shop...some differences, but some similarities here. > Where and how can we get a program and dates for a test of performance. > Have you checked with your local Digital people? I haven't, so can't help you here just yet. Also, how are your tables, logs set up? How are you setting up striping/mirroring? Best to set up the primary disks as regular JABOD and mirror that set and stripe the mirror. Tim