He's talking about RAID 1 here, not a gargantuan RAID 6. Onboard RAM on the controller card is going to make very little difference. All it will do is allow the card to re-order writes to a point (not all cards even do this). Alex. On 1/18/06, William Yu <wyu@xxxxxxxxxxx> wrote: > Benjamin Arai wrote: > > Obviously, I have done this to improve write performance for the update > > each week. My question is if I install a 3ware or similar card to > > replace my current software RAID 1 configuration, am I going to see a > > very large improvement? If so, what would be a ball park figure? > > The key is getting a card with the ability to upgrade the onboard ram. > > Our previous setup was a LSI MegaRAID 320-1 (128MB), 4xRAID10, > fsync=off. Replaced it with a ARC-1170 (1GB) w/ 24x7200RPM SATA2 drives > (split into 3 8-drive RAID6 arrays) and performance for us is through > the ceiling. > > For OLTP type updates, we've gotten about +80% increase. For massive > 1-statement updates, performance increase is in the +triple digits. > > ---------------------------(end of broadcast)--------------------------- > TIP 2: Don't 'kill -9' the postmaster >
