Looking for Linux file system performance tuning tips for LSI 9271-8i + 8 SSD's RAID0

[RJ1]

Here is an example of how I have tried to create an XFS file system for a 256K stripe 8 SSD RAID0:

mkfs.xfs -f -L DataRAID \
-b size=4096 \
-d sunit=512,swidth=4096 \
-l sunit=512,lazy-count=1,version=2,size=128m \
-i attr=2 /dev/sda


Here is the fstab entry I have tried to mount this XFS file system:

LABEL=DataRAID /DataRAID xfs rw,noatime,nodiratime,nodev,nosuid,logbsize=256k,l ogbufs=8,inode64,nobarrier,allocsize=64m 0 0


Here are some iozone results for this XFS file system with the LSI tweaks mentioned above in a previous post. Write performance still only around 2.6 GB/s. My goal is to get as close to 4 GB/s as possible.

------------------------------------------------------------------------------------------------

Iozone: Performance Test of File I/O
Version $Revision: 3.394 $
Compiled for 64 bit mode.
Build: linux

Contributors:William Norcott, Don Capps, Isom Crawford, Kirby Collins
Al Slater, Scott Rhine, Mike Wisner, Ken Goss
Steve Landherr, Brad Smith, Mark Kelly, Dr. Alain CYR,
Randy Dunlap, Mark Montague, Dan Million, Gavin Brebner,
Jean-Marc Zucconi, Jeff Blomberg, Benny Halevy, Dave Boone,
Erik Habbinga, Kris Strecker, Walter Wong, Joshua Root,
Fabrice Bacchella, Zhenghua Xue, Qin Li, Darren Sawyer.
Ben England.

Run began: Thu Jan 31 15:27:01 2013

Record Size 1024 KB
Record Size 2048 KB
Record Size 4096 KB
Record Size 8192 KB
Record Size 16384 KB
File size set to 100663296 KB
Command line used: /usr/bin/iozone -i 0 -i 1 -i 2 -r 1m -r 2m -r 4m -r 8m -r 16m -s 96g -f /DataRAID/testfile
Output is in Kbytes/sec
Time Resolution = 0.000001 seconds.
Processor cache size set to 1024 Kbytes.
Processor cache line size set to 32 bytes.
File stride size set to 17 * record size.
------------------------------------------------------random random bkwd record stride
----KB----reclen---write---rewrite----read----reread---read----write-----read rewrite read fwrite frewrite fread freread
100663296 1024 2634183 2877187 3985985 4002471 948822 3050027
100663296 2048 2677945 2966218 3981357 4009041 1491174 3022288
100663296 4096 2652620 3015210 3849320 3880013 1994893 2982310
100663296 8192 2467574 2776431 3587221 3602532 2509243 2801943
100663296 16384 2290530 2666110 3463176 3471063 2795685 2694036

iozone test complete.