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STEC ZeusIOPS raid5 bad random read performance

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pankakekid

n00b
Joined
Jun 6, 2011
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I've got 6 stec zeusiops disks in raid5 on an LSI 9280-16i4e. I got these results on a recent iozone run on the ext4 filestystem:



[root@box ssexport]# iozone -i 0 -i 2 -R -O -l 1 -u 1 -s 300g
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: Tue Jul 16 15:17:41 2013

Excel chart generation enabled
OPS Mode. Output is in operations per second.
File size set to 314572800 KB
Command line used: iozone -i 0 -i 2 -R -O -l 1 -u 1 -s 300g
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.
Min process = 1
Max process = 1
Throughput test with 1 process
Each process writes a 314572800 Kbyte file in 4 Kbyte records

Children see throughput for 1 initial writers = 176711.80 ops/sec
Parent sees throughput for 1 initial writers = 175012.85 ops/sec
Min throughput per process = 176711.80 ops/sec
Max throughput per process = 176711.80 ops/sec
Avg throughput per process = 176711.80 ops/sec
Min xfer = 78643200.00 ops

Children see throughput for 1 rewriters = 206000.53 ops/sec
Parent sees throughput for 1 rewriters = 203741.63 ops/sec
Min throughput per process = 206000.53 ops/sec
Max throughput per process = 206000.53 ops/sec
Avg throughput per process = 206000.53 ops/sec
Min xfer = 78643200.00 ops

Children see throughput for 1 random readers = 5605.27 ops/sec
Parent sees throughput for 1 random readers = 5605.27 ops/sec
Min throughput per process = 5605.27 ops/sec
Max throughput per process = 5605.27 ops/sec
Avg throughput per process = 5605.27 ops/sec
Min xfer = 78643200.00 ops

Children see throughput for 1 random writers = 13900.09 ops/sec
Parent sees throughput for 1 random writers = 13469.88 ops/sec
Min throughput per process = 13900.09 ops/sec
Max throughput per process = 13900.09 ops/sec
Avg throughput per process = 13900.09 ops/sec
Min xfer = 78643200.00 ops



"Throughput report Y-axis is type of test X-axis is number of processes"
"Record size = 4 Kbytes "
"Output is in ops/sec"

" Initial write " 176711.80

" Rewrite " 206000.53

" Random read " 5605.27

" Random write " 13900.09


iozone test complete.


Anyone have any idea why random read performance is so bad?
D
 
update the firmware on the card? update the firmware on the drives?

that seems really low i would expect one more zero to the left of that decimal for random read @4K block sizes.
 
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