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.
--
You received this question notification because your team sysbench-
developers is an answer contact for sysbench.
_______________________________________________
Mailing list: https://launchpad.net/~sysbench-developers
Post to : [email protected]
Unsubscribe : https://launchpad.net/~sysbench-developers
More help : https://help.launchpad.net/ListHelp
