Re: Informix Online 5 running on RAID5

In article <3tf5n9$6hd@cssun.mathcs.emory.edu>, cwakins@leia.alloys.rmc.com says... > >> We are preparing to implement 3 Informix Databases on a DEC Alpha with a >> RAID5 Array configuration. >> >> Does anyone have any comments regarding performance of RAID5 with >> Informix Online ver 5 verses a RAID 1 or 0 configuration? especially with >> OSF/1 ver 3.0 > >RAID5 works pretty well for us, performance-wise. The main advantage is >that we get to have the redundancy of 2n disks with n+1 disks. Why aren't >you using 7.1? It has many tools that let the DBA enhance performance, >though most of them are lost if you use RAID5. > >> The Box will be a DEC Alpha 2100 4/200 with 2 190Mhz processors, 384 Mb >> Ram, 6 x 2.1 GB HDD on a 3 Channel EISA controller. > >The 2 processors would help a lot more under 7.1, and 4 processors would >help more than 2x2. The speed curve for adding processors is not at >all linear. > >> Please mail any help to me at keithg@enerco.co.nz > >I'll also copy this to the CDI forum. > >> All help would be appreciated >> >> Thanks in Advance >> Keith Gerritsen >> Lan Manager >> Enerco Gas Auckland New Zealand > >If you'd like to see it, I gathered together all the messages I saved that >pertain to Alpha and sent them all to another guy who asked for it. It >is an incomplete list of bugs, version compatibilities, and such. > >BTW, do you have a bona-fide DBA? OnLine can be complex to manage, and >versions higher than 5 really do justify the expense for an installation >as large as yours. > >Good luck, > > __________________________________________________________________ > | Clem Akins Standard Disclaimers Apply | > |Reynolds Metals Co, Alloys Plant "Climb High, Cave Deep!" | > | Muscle Shoals, Alabama USA cwakins@leia.alloys.rmc.com | > |________________________________________________________________| We are running a AXP 2100 with 40+ Gb RAID 5 disks, and it works fine too. Remember to split your RAID disk in 2 GB slices, because INFORMIX doesnt support larger chunks or offset to chunks. Currently we are running 5.05 on the Alpha, waiting for 7.10UD1 to be ready. With 7.10UC1 we found a bug in ontape (Could'nt restore blob data). Performance-wise I have seen a BIG difference during backup and restore between 5.0X and 7.10. Clem, I would like to get a copy of your Alpha/INFORMIX collection too. Do you have any info about 7.20UC1. I have seen, that it will contain 64-bit support on the Alpha-platform, and it should be ready soon. Tom Jakobsen PFA Pension tja@pfa.dk