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[Nitin Manjalkar <question434586@xxxxxxxxxxxxxxxxxxxxx>]

New question #434586 on sysbench:
https://answers.launchpad.net/sysbench/+question/434586

The test case is like this:
 
1) Using sysbench to test the disk throughput.
2) Using write back and disk cache with raid 5.
3) disks : Intel S3610 X 6
 
 
 
root@bb-blr-prod-db-01:/cryptfs# sysbench --num-threads=2  --test=fileio --file-total-size=350G --file-test-mode=rndrw --init-rng=on -
-max-time=3600 --max-requests=0 run
sysbench 0.4.12:  multi-threaded system evaluation benchmark

Running the test with following options:
Number of threads: 2
Initializing random number generator from timer.


Extra file open flags: 0
128 files, 2.7344Gb each
350Gb total file size
Block size 16Kb
Number of random requests for random IO: 0
Read/Write ratio for combined random IO test: 1.50
Periodic FSYNC enabled, calling fsync() each 100 requests.
Calling fsync() at the end of test, Enabled.
Using synchronous I/O mode
Doing random r/w test
Threads started!
FATAL: Failed to fsync file! file: 0 errno = 22 ()
FATAL: Incorrect file discovered in request
Done.

Operations performed:  2475038 Read, 1650025 Write, 5306656 Other = 9431719 Total
Read 37.766Gb  Written 25.177Gb  Total transferred 62.943Gb  (176.76Mb/sec)
11312.79 Requests/sec executed

Test execution summary:
   total time:                          364.6370s
   total number of events:              4125063
   total time taken by event execution: 475.9527
   per-request statistics:
        min:                                  0.00ms
        avg:                                  0.12ms
        max:                                 12.39ms
        approx.  95 percentile:               0.53ms

Threads fairness:
   events (avg/stddev):           2062531.5000/3374.50
   execution time (avg/stddev):   237.9764/0.04
 
IOSTAT result:
 
 
avg-cpu:  %user   %nice %system %iowait  %steal   %idle 
          0.05    0.00    0.98    2.25    0.00   96.72

Device:         rrqm/s   wrqm/s     r/s     w/s    rkB/s    wkB/s avgrq-sz avgqu-sz   await r_await w_await  svctm  %util
sda               0.00     0.00    0.00    0.00     0.00     0.00     0.00     0.00    0.00    0.00    0.00   0.00   0.00
sdb               0.00     0.00 2775.00 4573.00 54708.00 72828.00    34.71     1.90    0.26    0.50    0.11   0.12  90.00
dm-0              0.00     0.00 2777.00 4569.00 54740.00 72764.00    34.71     2.18    0.30    0.55    0.15   0.13  94.00

avg
 
 
 
My Raid volume config :
 
 
Advanced Properties

Status	 
Name	sdb
Device Description	Virtual Disk 1 on Integrated RAID Controller 1
State	Online
Layout	RAID-5
Size	7449.38 GB
Span Depth	1
Block Size	512 bytes
Bus Protocol	SATA
Media Type	SSD
Operational State	Not Applicable
Read Policy	Read Ahead
	
Write Policy	Write Back
Stripe Size	64K
Disk Cache Policy	Enabled
Enhanced Cache	Not Applicable
Progress	Not Applicable
Bad Blocks Found	No
Secured	No
Remaining Redundancy	1
T10 PI Status	Disabled

 
 
As you saw, the IO is getting choked @ 4500 IOPS  in a long run test. I am also not able to run this test with 2 threads.

Pls advise.


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