gives a speed at only about 5000K/sec , and HIGH load average :
# uptime
20:03:55 up 8 days, 19:55, 1 user, load average: 11.70, 4.04, 1.52
loadav is a bit misleading - it doesn't mean you had >11 runnable jobs.
you might just have more jobs waiting on IO, being starved by the
IO done by resync.
Chunk Size : 256K
well, that's pretty big. it means 6*256K is necessary to do a
whole-stripe update; your stripe cache may be too small to be effective.
If they are on the PCI bus, that is about right, you probably should be
getting 10-15MB/s, but it is about right. If you had each drive on its own
PCI-e controller, then you would get much faster speeds.
10-15 seems bizarrely low - one can certainly achieve >100 MB/s
over the PCI bus, so where does the factor of 6-10 come in?
seems like a R6 resync would do 4 reads and 2 writes for every
4 chunks of throughput (so should achieve more like 50 MB/s if
the main limit is the bus at 100.)
There are two controllers, 4 disks connected to one controller on the PCI-bus
and 2 disks connected to the other controller.
well, you should probably look at the PCI topology ("lspci -v -t"),
and perhaps even the PCI settings (as well as stripe cache size,
perhaps nr_requests, etc)
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