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 EXT4 file system for a 256K stripe 8 SSD RAID0:

mkfs.ext4 -b 4096 -E stride=64,stripe-width=512 -O ^has_journal -L DataRAID /dev/sda


Here is the fstab entry I have tried to mount this EXT4 file system:

LABEL=DataRAID /DataRAID ext4 rw,noatime,nodiratime,nodev,nosuid,nobh,data=write back,barrier=0 0 0


Here are some iozone results for this EXT4 file system with the LSI tweaks mentioned above in a previous post. The XFS results look better than these EXT4 results.


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

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 11:23:57 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 2088831 2296893 3981856 3992165 958220 2305406
100663296 2048 2109006 2276364 3961707 3995606 1488399 2263700
100663296 4096 2035761 2237523 3836874 3854241 1992631 2196442
100663296 8192 1962799 2116072 3514392 3540483 2507479 2132013
100663296 16384 2046374 2212523 3425371 3445564 2781162 2232889

iozone test complete.