On 31 January 2011 08:52, Keld JÃrn Simonsen <keld@xxxxxxxxxx> wrote: > If your intallation is CPU bound, and you are > using an Atom N270 processor or the like, well some ideas: > > The Atom CPU may have threading, so you could run 2 RAIDs > which then probably would run in each thread. > It would cost you 1 more disk if you run 2 RAID5's > so you get 8 TB payload out of your 12 GB total (6 drives of 2 TB each). > > Another way to get better performance could be to use less > CPU-intensitive RAID types. RAID5 is intensitive as it needs to > calculate XOR information all the time. Maybe a mirrored > raid type like RAID10,f2 would give you less CPU usage, > and the run 2 RAIDS to have it running in both hyperthreads. > Here you would then only get 6 TB payload of your 12 GB disks, > but then also probably a faster system. > > Best regards > keld > Hi, It's interesting what you say about the XOR calculations. I thought that it was only calculated on writes? The Atom (330) has HT, so Linux sees 4 logical CPUs. // Mathias -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
