On 2010-07-14 at 20:32-07 Bond Masuda <[email protected]> wrote: > We're seeing a performance bottleneck of about 200MBytes/sec > sequential writes when testing with iozone. We were expecting with > 7x effective spindles on the RAID-10, to get about ~350MBytes/sec > sustained writes for sequential access.
200MiB/s is the default value for /proc/sys/dev/raid/speed_limit_max, so I'm wondering if the md driver is counting non-recovery RAID1 syncing against speed_limit_max. Do you see better performance if you increase speed_limit_max? (If you increase speed_limit_max, make sure that the instance-specific value in sysfs isn't being set separately--see Documentation/md.txt from the Linux kernel.) _______________________________________________ Linux-PowerEdge mailing list [email protected] https://lists.us.dell.com/mailman/listinfo/linux-poweredge Please read the FAQ at http://lists.us.dell.com/faq
