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  1. M

    Software RAID 5 speed issues

    Thank you Tim for the constant helpful input while I struggle through this. I did some Samba read/write tests, rsync read/write tests, and some iozone tests. Samba read writes with a 5 gig file, gigabit ethernet, hooked straight to the switch, with options "socket options = TCP_NODELAY...
  2. M

    Software RAID 5 speed issues

    So I aligned the 4k boundary by starting each raid partition on sector 56. This fixed the logs in messages. So I did some further tests. For whatever reason, dd without any options still writes about 1/2 as fast on Beast than Spiderman. As soon as I add a bs with some counts, the speeds...
  3. M

    Software RAID 5 speed issues

    My logs are also full of messages like this, every once and a while. Maybe a correlation. I can consistently make it happen by making and remaking an ext4 file system. It'll hang for a few seconds, then these appear in /var/messages...
  4. M

    Software RAID 5 speed issues

    It's half the size because it's writing at half the speed ;) Check the length of time I let dd run -- approximately 40 seconds on both machines. This Celeron is much older and single core. The Atom has a faster clock speed, more cores, and same cache. Why would the Atom not be faster...
  5. M

    Software RAID 5 speed issues

    Maybe you guys can help me out. I initially started with Ubuntu 10.04 (Spiderman) on a hacked ss4200 (Celeron 420 w/ 512 RAM) with 2x1TB WD Green EARS and 2x1TB WD GREEN EADS. I set up a software RAID 1 across the boot partition on 2 drives, and a software RAID 5 (64k chunk) across all...
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