Hello Mikael, Saturday, June 28, 2003, 4:42:58 PM, you wrote: MA> Which is exactly what we all get in real-life file server environment when MA> using onboard RAID5 without a lot of onboard cache (though I have seen the MA> same behaviour even on SX6000 with 128 meg ram). Filesystem read is MA> phenomenally fast (I have seen 150 meg+ off of 8 disk arrays) but write is MA> very slow (5-10 meg/s). Sequential write is also fast, but that never MA> happens in a fileserver environment. Exactly. One seriously looking for good random write performance should use RAID10 - it's nearly as fast as RAID0 on 3ware. But that's another story - it's not so cheap. BTW re RAID performance i can recommend this excelent testing http://www.fcenter.ru/articles.shtml?hdd/2216#4 He tested 3w7810 but I believe for random access 7810 and 7500-8 is equivalent. It is in Russian, but all significant info (diagrams, charts) in English. -- Best regards, Alex mailto:alexver5@mail.ru - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
