On Sat, 2006-09-02 at 10:53 +0300, Rafi Gordon wrote: > Hi Gilboa , > > Thanks for your qeustion. > > I had encountered chapter 26 , which is devoted to linux software raid ,in > "Linux(r) Quick Fix Notebook" book By Peter Harrison. > (Published by Prentice Hall.) > Here is a quote grom the end of this chapter: > > CONCLUSION > Linux software RAID provides redundancy across partitions and hard disks, > but it tends to be slower and less reliable than RAID provided by a > hardwarebased > RAID disk controller. > > > No advantage what-so-ever > > So when you say "No advantage what-so-ever" ,are you referring only when > comparing linux raid software to chip IDE RAID cards ? or is your > opinion different than Peter Harrison, the book author ? > > Regards, > R. Gordon
In my previous workplace we did extensive benchmarks between a 3ware 9xxx 8-port SATA RAID controller and software RAID using the Intel ICH and in general, the 3ware was indeed faster (and much more expensive). However, under certain workloads the software RAID outperformed it and as we replaced the CPUs from Nocoma Xeons to AMD Opteorns, the performance gap decrease considerably. In short, if you afford an expensive SATA/IDE raid, it -should- perform better then the kernel software RAID. If you want to spend less then 400 $ on a (new) RAID controller, don't bother, it'll perform much slower then the Linux' software RAID. * * As long as you have a reasonably fast (P4 > 2Ghz, AMD > 1.4Ghz) machine and enough memory. Gilboa ================================================================= To unsubscribe, send mail to [EMAIL PROTECTED] with the word "unsubscribe" in the message body, e.g., run the command echo unsubscribe | mail [EMAIL PROTECTED]
