23.07.2012 21:59, Yuri Vorobyev пишет:

I faced with a strange performance problem with new disk shelf.
We a using  ZFS system with SATA disks for a while.


What OS and release?
Oh. I forgot this important thing.
It is OpenIndiana oi_151a5 now.


New testing data:

I reboot to first boot environment with original io_151 dev installed (without updates).
Read speed remains the same. About 150Mb/s.

Now something intresting. Booted to Centos 6.3 live CD
Create software raid10:
#mdadm -C /dev/md0 --level=raid10 --assume-clean --raid-devices=10 /dev/sdac /dev/sdad /dev/sdae /dev/sdaf /dev/sdag /dev/sdah /dev/sdai /dev/sdaj /dev/sdak /dev/sdal

# dd if=/dev/zero of=zero bs=1M count=5000
5000+0 records in
5000+0 records out
5242880000 bytes (5.2 GB) copied, 9.50402 s, 552 MB/s

cleaning file system caches:

# free
             total       used       free     shared    buffers     cached
Mem:      99195228    6800076   92395152          0      22184    5269432
-/+ buffers/cache:    1508460   97686768
Swap:            0          0          0
# echo 3 > /proc/sys/vm/drop_caches
# free
             total       used       free     shared    buffers     cached
Mem:      99195228    1434564   97760664          0       1964      75988
-/+ buffers/cache:    1356612   97838616
Swap:            0          0          0


# dd if=zero of=/dev/null bs=1M
5000+0 records in
5000+0 records out
5242880000 bytes (5.2 GB) copied, 5.65738 s, 927 MB/s

iostat during reading here http://pastebin.com/rwd0LWdc
CentOS dmesg here https://dl.dropbox.com/u/12915469/centos_dmesg.txt

Sequential speed 6 times more than in OpenIndiana.
Seems like driver bug in mpt_sas? Remind you HBA is LSI 9205-8e (2308 chip).

LSI support answered me OpenIndiana not supported OS (who would doubt...)
What should i do? Go to time-tested LSI2008 HBA?



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