change speed_limit_max to a bigger value will help. Jack 2012/4/18 George Spelvin <linux@xxxxxxxxxxx>: > I'm putting together a 7x2TB RAID6 for a home media server, and after > encountering a fun kernel bug building the array (old kernel, a new one > fixed it), I fot things working, but now notice that each disk is syncing > at 23.8 MB/s. hdparm -t reports they can do well over 100 MB/s each, > and the processor, while only an i3, is spending about 20% of one core > in the raid6 task. > > Basicall, it was created with: > mdadm -C -l 6 -n 7 -c 128 -b internal /dev/md0 /dev/sd[b-h] > (The kernel bug was in 2.6.35, and was triggered by forgetting the > "/dev/md0"; one of the RAID ioctls it tries confused up the /dev/sd > driver quite thoroughly) > > It's an Intel chipset motherboard with a jmicros 2xSATA+PATA chip, > and one port on a SiI3132 plug-in card. And mostly cheap Caviar green > EARS drives (yes, I know about the lack of TLER). Note that I didn't > partition the drives, so there's no risk of a 4K-unaligned partition. > > A friend with his own Linux media server said he saw the exact same speed > building his RAID6 array. > > The speed_limit_max is set to the default, the system is idle, and the > resultant md drive is not mounted. > > Is there a web page somewhere with speed tuning suggestions? > > > Thank you! > -- > 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 -- 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
