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Windows 2012, Poweredge 530 SLOW PERC H730 Performance
We have a recently purchased Dell Poweredge R530, 32GB RAM, Dual Xeon E52620V3 CPU's.
We are experiencing horrible disk performance, running dskspd.exe, we are seeing individual drives performing as low as 1.3MB/s on reads, and the highest test we ran showed just a bit over 3.0MB/s on reads.
Write speeds are even worse.
I've updated firmware on the PERC H730 and updated to the latest windows driver, and it's still very slow.
Configuration is as follows:
2 1TB SATA drives - Setup RAID 1 with two virtual drives for the OS drive
4 4TB SATA Drives - Setup RAID 5 - 1 virtual drive for MSSQL
OS is Windows Server 2012R2 with all the latest updates - Server is in production so I can't do any destructive testing.
Results from DSKSPD.EXE (this is the highest performance result):
Command Line: C:\DskSpd\diskspd.exe -b8k -o4 -t8 -h -r -w25 -z40m -c200m C:\DskSpd\IOtest.dat
Input parameters:
timespan: 1
-------------
duration: 10s
warm up time: 5s
cool down time: 0s
random seed: 40
path: 'C:\DskSpd\IOtest.dat'
think time: 0ms
burst size: 0
software cache disabled
hardware write cache disabled, writethrough on
performing mix test (read/write ratio: 75/25)
block size: 8192
using random I/O (alignment: 8192)
number of outstanding I/O operations: 4
thread stride size: 0
threads per file: 8
using I/O Completion Ports
IO priority: normal
Results for timespan 1:
*******************************************************************************
actual test time: 10.01s
thread count: 8
proc count: 64
CPU | Usage | User | Kernel | Idle
-------------------------------------------
0| 0.31%| 0.00%| 0.31%| 99.62%
1| 0.62%| 0.00%| 0.62%| 99.31%
2| 0.16%| 0.00%| 0.16%| 99.78%
3| 0.16%| 0.00%| 0.16%| 99.78%
4| 0.16%| 0.00%| 0.16%| 99.78%
5| 0.16%| 0.00%| 0.16%| 99.78%
6| 0.16%| 0.00%| 0.16%| 99.78%
7| 0.00%| 0.00%| 0.00%| 99.94%
8| 0.00%| 0.00%| 0.00%| 99.94%
9| 0.31%| 0.16%| 0.16%| 99.62%
10| 0.00%| 0.00%| 0.00%| 100.09%
11| 0.00%| 0.00%| 0.00%| 99.94%
12| 0.00%| 0.00%| 0.00%| 99.94%
13| 0.00%| 0.00%| 0.00%| 100.09%
14| 0.00%| 0.00%| 0.00%| 99.78%
15| 0.00%| 0.00%| 0.00%| 99.78%
16| 0.00%| 0.00%| 0.00%| 99.94%
17| 0.00%| 0.00%| 0.00%| 99.78%
18| 0.00%| 0.00%| 0.00%| 99.94%
19| 0.00%| 0.00%| 0.00%| 100.09%
20| 0.00%| 0.00%| 0.00%| 99.78%
21| 0.00%| 0.00%| 0.00%| 99.94%
22| 0.00%| 0.00%| 0.00%| 99.78%
23| 0.00%| 0.00%| 0.00%| 99.78%
24| 0.00%| 0.00%| 0.00%| 0.00%
25| 0.00%| 0.00%| 0.00%| 0.00%
26| 0.00%| 0.00%| 0.00%| 0.00%
27| 0.00%| 0.00%| 0.00%| 0.00%
28| 0.00%| 0.00%| 0.00%| 0.00%
29| 0.00%| 0.00%| 0.00%| 0.00%
30| 0.00%| 0.00%| 0.00%| 0.00%
31| 0.00%| 0.00%| 0.00%| 0.00%
32| 0.00%| 0.00%| 0.00%| 0.00%
33| 0.00%| 0.00%| 0.00%| 0.00%
34| 0.00%| 0.00%| 0.00%| 0.00%
35| 0.00%| 0.00%| 0.00%| 0.00%
36| 0.00%| 0.00%| 0.00%| 0.00%
37| 0.00%| 0.00%| 0.00%| 0.00%
38| 0.00%| 0.00%| 0.00%| 0.00%
39| 0.00%| 0.00%| 0.00%| 0.00%
40| 0.00%| 0.00%| 0.00%| 0.00%
41| 0.00%| 0.00%| 0.00%| 0.00%
42| 0.00%| 0.00%| 0.00%| 0.00%
43| 0.00%| 0.00%| 0.00%| 0.00%
44| 0.00%| 0.00%| 0.00%| 0.00%
45| 0.00%| 0.00%| 0.00%| 0.00%
46| 0.00%| 0.00%| 0.00%| 0.00%
47| 0.00%| 0.00%| 0.00%| 0.00%
48| 0.00%| 0.00%| 0.00%| 0.00%
49| 0.00%| 0.00%| 0.00%| 0.00%
50| 0.00%| 0.00%| 0.00%| 0.00%
51| 0.00%| 0.00%| 0.00%| 0.00%
52| 0.00%| 0.00%| 0.00%| 0.00%
53| 0.00%| 0.00%| 0.00%| 0.00%
54| 0.00%| 0.00%| 0.00%| 0.00%
55| 0.00%| 0.00%| 0.00%| 0.00%
56| 0.00%| 0.00%| 0.00%| 0.00%
57| 0.00%| 0.00%| 0.00%| 0.00%
58| 0.00%| 0.00%| 0.00%| 0.00%
59| 0.00%| 0.00%| 0.00%| 0.00%
60| 0.00%| 0.00%| 0.00%| 0.00%
61| 0.00%| 0.00%| 0.00%| 0.00%
62| 0.00%| 0.00%| 0.00%| 0.00%
63| 0.00%| 0.00%| 0.00%| 0.00%
-------------------------------------------
avg.| 0.03%| 0.00%| 0.03%| 37.44%
Total IO
thread | bytes | I/Os | MB/s | I/O per s | file
------------------------------------------------------------------------------
0 | 35962880 | 4390 | 3.43 | 438.72 | C:\DskSpd\IOtest.dat (200MB)
1 | 35323904 | 4312 | 3.37 | 430.92 | C:\DskSpd\IOtest.dat (200MB)
2 | 36331520 | 4435 | 3.46 | 443.22 | C:\DskSpd\IOtest.dat (200MB)
3 | 36134912 | 4411 | 3.44 | 440.82 | C:\DskSpd\IOtest.dat (200MB)
4 | 36798464 | 4492 | 3.51 | 448.91 | C:\DskSpd\IOtest.dat (200MB)
5 | 37142528 | 4534 | 3.54 | 453.11 | C:\DskSpd\IOtest.dat (200MB)
6 | 35758080 | 4365 | 3.41 | 436.22 | C:\DskSpd\IOtest.dat (200MB)
7 | 35602432 | 4346 | 3.39 | 434.32 | C:\DskSpd\IOtest.dat (200MB)
------------------------------------------------------------------------------
total: 289054720 | 35285 | 27.55 | 3526.23
Read IO
thread | bytes | I/Os | MB/s | I/O per s | file
------------------------------------------------------------------------------
0 | 26812416 | 3273 | 2.56 | 327.09 | C:\DskSpd\IOtest.dat (200MB)
1 | 26312704 | 3212 | 2.51 | 320.99 | C:\DskSpd\IOtest.dat (200MB)
2 | 27238400 | 3325 | 2.60 | 332.29 | C:\DskSpd\IOtest.dat (200MB)
3 | 27295744 | 3332 | 2.60 | 332.99 | C:\DskSpd\IOtest.dat (200MB)
4 | 27418624 | 3347 | 2.61 | 334.49 | C:\DskSpd\IOtest.dat (200MB)
5 | 28008448 | 3419 | 2.67 | 341.68 | C:\DskSpd\IOtest.dat (200MB)
6 | 26214400 | 3200 | 2.50 | 319.79 | C:\DskSpd\IOtest.dat (200MB)
7 | 26599424 | 3247 | 2.54 | 324.49 | C:\DskSpd\IOtest.dat (200MB)
------------------------------------------------------------------------------
total: 215900160 | 26355 | 20.58 | 2633.81
Write IO
thread | bytes | I/Os | MB/s | I/O per s | file
------------------------------------------------------------------------------
0 | 9150464 | 1117 | 0.87 | 111.63 | C:\DskSpd\IOtest.dat (200MB)
1 | 9011200 | 1100 | 0.86 | 109.93 | C:\DskSpd\IOtest.dat (200MB)
2 | 9093120 | 1110 | 0.87 | 110.93 | C:\DskSpd\IOtest.dat (200MB)
3 | 8839168 | 1079 | 0.84 | 107.83 | C:\DskSpd\IOtest.dat (200MB)
4 | 9379840 | 1145 | 0.89 | 114.43 | C:\DskSpd\IOtest.dat (200MB)
5 | 9134080 | 1115 | 0.87 | 111.43 | C:\DskSpd\IOtest.dat (200MB)
6 | 9543680 | 1165 | 0.91 | 116.43 | C:\DskSpd\IOtest.dat (200MB)
7 | 9003008 | 1099 | 0.86 | 109.83 | C:\DskSpd\IOtest.dat (200MB)
------------------------------------------------------------------------------
total: 73154560 | 8930 | 6.97 | 892.43
theflash1932
9 Legend
9 Legend
•
16.3K Posts
0
November 27th, 2017 14:00
What is the make/model of the drives? Did they come installed in the system from Dell?
DELL-Josh Cr
Moderator
Moderator
•
8.7K Posts
0
November 27th, 2017 16:00
Hi,
Is caching enabled on the controller?
sheehanje
6 Posts
0
November 28th, 2017 06:00
All drives were purchased with the system - I don't know the exact model of the 1TB drives, but the 4TB are HUS726040ALA610 I believe - I pulled the hot spare on the RAID 5 to look at the model - I did not want to disturb the RAID 1 set.
sheehanje
6 Posts
0
November 28th, 2017 07:00
The Cache is enabled through the PERC configuration - it's set to Write Back and Read Ahead.
pcmeiners
4 Operator
4 Operator
•
1.8K Posts
0
November 28th, 2017 15:00
" hardware write cache disabled, writethrough on"
It appears the program disables write back, without WB your disk array will have dismal performance .
sheehanje
6 Posts
0
November 29th, 2017 12:00
I decided to run this again without the -h option, which doesn't omit hardware cache, and I'm running into similar results. In studying this a little more (this problem was passed onto me from a vendor), I notice these results are only on our RAID 1 volumes (Drives C and I)
On our RAID 5 volume (drive D), performance is much faster. Here are the results from those two tests:
Command Line: C:\DskSpd\diskspd.exe -b8k -o4 -t8 -r -w25 -z40m -c200m C:\DskSpd\IOtest.dat Input parameters: timespan: 1 ------------- duration: 10s warm up time: 5s cool down time: 0s random seed: 40 path: 'C:\DskSpd\IOtest.dat' think time: 0ms burst size: 0 using software cache using hardware write cache, writethrough off performing mix test (read/write ratio: 75/25) block size: 8192 using random I/O (alignment: 8192) number of outstanding I/O operations: 4 thread stride size: 0 threads per file: 8 using I/O Completion Ports IO priority: normal Results for timespan 1: ******************************************************************************* actual test time: 10.01s thread count: 8 proc count: 64 CPU | Usage | User | Kernel | Idle ------------------------------------------- 0| 0.00%| 0.00%| 0.00%| 99.72% 1| 0.16%| 0.00%| 0.16%| 99.72% 2| 1.09%| 0.31%| 0.78%| 98.78% 3| 0.16%| 0.00%| 0.16%| 99.72% 4| 0.47%| 0.00%| 0.47%| 99.25% 5| 0.00%| 0.00%| 0.00%| 99.72% 6| 0.16%| 0.00%| 0.16%| 99.56% 7| 0.16%| 0.00%| 0.16%| 99.56% 8| 0.00%| 0.00%| 0.00%| 99.72% 9| 0.00%| 0.00%| 0.00%| 100.03% 10| 0.00%| 0.00%| 0.00%| 99.72% 11| 0.00%| 0.00%| 0.00%| 99.56% 12| 0.16%| 0.00%| 0.16%| 99.56% 13| 0.00%| 0.00%| 0.00%| 99.72% 14| 0.00%| 0.00%| 0.00%| 99.72% 15| 0.00%| 0.00%| 0.00%| 99.72% 16| 0.47%| 0.00%| 0.47%| 99.41% 17| 0.00%| 0.00%| 0.00%| 99.72% 18| 0.00%| 0.00%| 0.00%| 99.88% 19| 0.00%| 0.00%| 0.00%| 99.72% 20| 0.00%| 0.00%| 0.00%| 99.88% 21| 0.00%| 0.00%| 0.00%| 99.72% 22| 0.16%| 0.00%| 0.16%| 99.72% 23| 0.00%| 0.00%| 0.00%| 99.88% 24| 0.00%| 0.00%| 0.00%| 0.00% 25| 0.00%| 0.00%| 0.00%| 0.00% 26| 0.00%| 0.00%| 0.00%| 0.00% 27| 0.00%| 0.00%| 0.00%| 0.00% 28| 0.00%| 0.00%| 0.00%| 0.00% 29| 0.00%| 0.00%| 0.00%| 0.00% 30| 0.00%| 0.00%| 0.00%| 0.00% 31| 0.00%| 0.00%| 0.00%| 0.00% 32| 0.00%| 0.00%| 0.00%| 0.00% 33| 0.00%| 0.00%| 0.00%| 0.00% 34| 0.00%| 0.00%| 0.00%| 0.00% 35| 0.00%| 0.00%| 0.00%| 0.00% 36| 0.00%| 0.00%| 0.00%| 0.00% 37| 0.00%| 0.00%| 0.00%| 0.00% 38| 0.00%| 0.00%| 0.00%| 0.00% 39| 0.00%| 0.00%| 0.00%| 0.00% 40| 0.00%| 0.00%| 0.00%| 0.00% 41| 0.00%| 0.00%| 0.00%| 0.00% 42| 0.00%| 0.00%| 0.00%| 0.00% 43| 0.00%| 0.00%| 0.00%| 0.00% 44| 0.00%| 0.00%| 0.00%| 0.00% 45| 0.00%| 0.00%| 0.00%| 0.00% 46| 0.00%| 0.00%| 0.00%| 0.00% 47| 0.00%| 0.00%| 0.00%| 0.00% 48| 0.00%| 0.00%| 0.00%| 0.00% 49| 0.00%| 0.00%| 0.00%| 0.00% 50| 0.00%| 0.00%| 0.00%| 0.00% 51| 0.00%| 0.00%| 0.00%| 0.00% 52| 0.00%| 0.00%| 0.00%| 0.00% 53| 0.00%| 0.00%| 0.00%| 0.00% 54| 0.00%| 0.00%| 0.00%| 0.00% 55| 0.00%| 0.00%| 0.00%| 0.00% 56| 0.00%| 0.00%| 0.00%| 0.00% 57| 0.00%| 0.00%| 0.00%| 0.00% 58| 0.00%| 0.00%| 0.00%| 0.00% 59| 0.00%| 0.00%| 0.00%| 0.00% 60| 0.00%| 0.00%| 0.00%| 0.00% 61| 0.00%| 0.00%| 0.00%| 0.00% 62| 0.00%| 0.00%| 0.00%| 0.00% 63| 0.00%| 0.00%| 0.00%| 0.00% ------------------------------------------- avg.| 0.05%| 0.00%| 0.04%| 37.37% Total IO thread | bytes | I/Os | MB/s | I/O per s | file ------------------------------------------------------------------------------ 0 | 16613376 | 2028 | 1.58 | 202.55 | C:\DskSpd\IOtest.dat (200MB) 1 | 16482304 | 2012 | 1.57 | 200.95 | C:\DskSpd\IOtest.dat (200MB) 2 | 16613376 | 2028 | 1.58 | 202.55 | C:\DskSpd\IOtest.dat (200MB) 3 | 16424960 | 2005 | 1.56 | 200.25 | C:\DskSpd\IOtest.dat (200MB) 4 | 15622144 | 1907 | 1.49 | 190.46 | C:\DskSpd\IOtest.dat (200MB) 5 | 15949824 | 1947 | 1.52 | 194.46 | C:\DskSpd\IOtest.dat (200MB) 6 | 15884288 | 1939 | 1.51 | 193.66 | C:\DskSpd\IOtest.dat (200MB) 7 | 17416192 | 2126 | 1.66 | 212.34 | C:\DskSpd\IOtest.dat (200MB) ------------------------------------------------------------------------------ total: 131006464 | 15992 | 12.48 | 1597.22 Read IO thread | bytes | I/Os | MB/s | I/O per s | file ------------------------------------------------------------------------------ 0 | 12320768 | 1504 | 1.17 | 150.21 | C:\DskSpd\IOtest.dat (200MB) 1 | 12451840 | 1520 | 1.19 | 151.81 | C:\DskSpd\IOtest.dat (200MB) 2 | 12386304 | 1512 | 1.18 | 151.01 | C:\DskSpd\IOtest.dat (200MB) 3 | 12279808 | 1499 | 1.17 | 149.71 | C:\DskSpd\IOtest.dat (200MB) 4 | 11984896 | 1463 | 1.14 | 146.12 | C:\DskSpd\IOtest.dat (200MB) 5 | 11730944 | 1432 | 1.12 | 143.02 | C:\DskSpd\IOtest.dat (200MB) 6 | 11968512 | 1461 | 1.14 | 145.92 | C:\DskSpd\IOtest.dat (200MB) 7 | 12902400 | 1575 | 1.23 | 157.30 | C:\DskSpd\IOtest.dat (200MB) ------------------------------------------------------------------------------ total: 98025472 | 11966 | 9.34 | 1195.12 Write IO thread | bytes | I/Os | MB/s | I/O per s | file ------------------------------------------------------------------------------ 0 | 4292608 | 524 | 0.41 | 52.33 | C:\DskSpd\IOtest.dat (200MB) 1 | 4030464 | 492 | 0.38 | 49.14 | C:\DskSpd\IOtest.dat (200MB) 2 | 4227072 | 516 | 0.40 | 51.54 | C:\DskSpd\IOtest.dat (200MB) 3 | 4145152 | 506 | 0.39 | 50.54 | C:\DskSpd\IOtest.dat (200MB) 4 | 3637248 | 444 | 0.35 | 44.34 | C:\DskSpd\IOtest.dat (200MB) 5 | 4218880 | 515 | 0.40 | 51.44 | C:\DskSpd\IOtest.dat (200MB) 6 | 3915776 | 478 | 0.37 | 47.74 | C:\DskSpd\IOtest.dat (200MB) 7 | 4513792 | 551 | 0.43 | 55.03 | C:\DskSpd\IOtest.dat (200MB) ------------------------------------------------------------------------------ total: 32980992 | 4026 | 3.14 | 402.10
--------------------------------------------------------------------------------------------------------------------
Command Line: D:\DskSpd\diskspd.exe -b8k -o4 -t8 -r -w25 -z40m -c200m D:\DskSpd\testfile5.dat Input parameters: timespan: 1 ------------- duration: 10s warm up time: 5s cool down time: 0s random seed: 40 path: 'D:\DskSpd\testfile5.dat' think time: 0ms burst size: 0 using software cache using hardware write cache, writethrough off performing mix test (read/write ratio: 75/25) block size: 8192 using random I/O (alignment: 8192) number of outstanding I/O operations: 4 thread stride size: 0 threads per file: 8 using I/O Completion Ports IO priority: normal Results for timespan 1: ******************************************************************************* actual test time: 10.00s thread count: 8 proc count: 64 CPU | Usage | User | Kernel | Idle ------------------------------------------- 0| 37.80%| 1.41%| 36.39%| 62.48% 1| 36.08%| 0.62%| 35.46%| 64.20% 2| 36.71%| 1.56%| 35.14%| 63.73% 3| 35.93%| 0.94%| 34.99%| 64.35% 4| 37.02%| 0.62%| 36.39%| 63.10% 5| 36.08%| 1.41%| 34.68%| 64.04% 6| 36.86%| 0.31%| 36.55%| 63.26% 7| 35.93%| 1.09%| 34.83%| 64.35% 8| 0.94%| 0.62%| 0.31%| 99.34% 9| 0.00%| 0.00%| 0.00%| 100.44% 10| 0.47%| 0.16%| 0.31%| 99.81% 11| 0.00%| 0.00%| 0.00%| 99.97% 12| 0.00%| 0.00%| 0.00%| 100.12% 13| 0.16%| 0.00%| 0.16%| 100.12% 14| 0.16%| 0.00%| 0.16%| 99.97% 15| 0.00%| 0.00%| 0.00%| 100.12% 16| 0.00%| 0.00%| 0.00%| 100.12% 17| 0.16%| 0.00%| 0.16%| 100.12% 18| 0.00%| 0.00%| 0.00%| 100.12% 19| 0.00%| 0.00%| 0.00%| 100.28% 20| 1.25%| 0.00%| 1.25%| 98.87% 21| 0.00%| 0.00%| 0.00%| 100.44% 22| 0.00%| 0.00%| 0.00%| 100.12% 23| 0.00%| 0.00%| 0.00%| 99.97% 24| 0.00%| 0.00%| 0.00%| 0.00% 25| 0.00%| 0.00%| 0.00%| 0.00% 26| 0.00%| 0.00%| 0.00%| 0.00% 27| 0.00%| 0.00%| 0.00%| 0.00% 28| 0.00%| 0.00%| 0.00%| 0.00% 29| 0.00%| 0.00%| 0.00%| 0.00% 30| 0.00%| 0.00%| 0.00%| 0.00% 31| 0.00%| 0.00%| 0.00%| 0.00% 32| 0.00%| 0.00%| 0.00%| 0.00% 33| 0.00%| 0.00%| 0.00%| 0.00% 34| 0.00%| 0.00%| 0.00%| 0.00% 35| 0.00%| 0.00%| 0.00%| 0.00% 36| 0.00%| 0.00%| 0.00%| 0.00% 37| 0.00%| 0.00%| 0.00%| 0.00% 38| 0.00%| 0.00%| 0.00%| 0.00% 39| 0.00%| 0.00%| 0.00%| 0.00% 40| 0.00%| 0.00%| 0.00%| 0.00% 41| 0.00%| 0.00%| 0.00%| 0.00% 42| 0.00%| 0.00%| 0.00%| 0.00% 43| 0.00%| 0.00%| 0.00%| 0.00% 44| 0.00%| 0.00%| 0.00%| 0.00% 45| 0.00%| 0.00%| 0.00%| 0.00% 46| 0.00%| 0.00%| 0.00%| 0.00% 47| 0.00%| 0.00%| 0.00%| 0.00% 48| 0.00%| 0.00%| 0.00%| 0.00% 49| 0.00%| 0.00%| 0.00%| 0.00% 50| 0.00%| 0.00%| 0.00%| 0.00% 51| 0.00%| 0.00%| 0.00%| 0.00% 52| 0.00%| 0.00%| 0.00%| 0.00% 53| 0.00%| 0.00%| 0.00%| 0.00% 54| 0.00%| 0.00%| 0.00%| 0.00% 55| 0.00%| 0.00%| 0.00%| 0.00% 56| 0.00%| 0.00%| 0.00%| 0.00% 57| 0.00%| 0.00%| 0.00%| 0.00% 58| 0.00%| 0.00%| 0.00%| 0.00% 59| 0.00%| 0.00%| 0.00%| 0.00% 60| 0.00%| 0.00%| 0.00%| 0.00% 61| 0.00%| 0.00%| 0.00%| 0.00% 62| 0.00%| 0.00%| 0.00%| 0.00% 63| 0.00%| 0.00%| 0.00%| 0.00% ------------------------------------------- avg.| 4.62%| 0.14%| 4.48%| 32.96% Total IO thread | bytes | I/Os | MB/s | I/O per s | file ------------------------------------------------------------------------------ 0 | 1365598208 | 166699 | 130.19 | 16664.35 | D:\DskSpd\testfile5.dat (200MB) 1 | 1368145920 | 167010 | 130.43 | 16695.44 | D:\DskSpd\testfile5.dat (200MB) 2 | 1351573504 | 164987 | 128.85 | 16493.20 | D:\DskSpd\testfile5.dat (200MB) 3 | 1350582272 | 164866 | 128.76 | 16481.11 | D:\DskSpd\testfile5.dat (200MB) 4 | 1358323712 | 165811 | 129.50 | 16575.58 | D:\DskSpd\testfile5.dat (200MB) 5 | 1343184896 | 163963 | 128.05 | 16390.84 | D:\DskSpd\testfile5.dat (200MB) 6 | 1361485824 | 166197 | 129.80 | 16614.16 | D:\DskSpd\testfile5.dat (200MB) 7 | 1338277888 | 163364 | 127.59 | 16330.96 | D:\DskSpd\testfile5.dat (200MB) ------------------------------------------------------------------------------ total: 10837172224 | 1322897 | 1033.17 | 132245.64 Read IO thread | bytes | I/Os | MB/s | I/O per s | file ------------------------------------------------------------------------------ 0 | 1022091264 | 124767 | 97.44 | 12472.54 | D:\DskSpd\testfile5.dat (200MB) 1 | 1027375104 | 125412 | 97.95 | 12537.02 | D:\DskSpd\testfile5.dat (200MB) 2 | 1013096448 | 123669 | 96.58 | 12362.78 | D:\DskSpd\testfile5.dat (200MB) 3 | 1014489088 | 123839 | 96.72 | 12379.78 | D:\DskSpd\testfile5.dat (200MB) 4 | 1015136256 | 123918 | 96.78 | 12387.67 | D:\DskSpd\testfile5.dat (200MB) 5 | 1006469120 | 122860 | 95.95 | 12281.91 | D:\DskSpd\testfile5.dat (200MB) 6 | 1018445824 | 124322 | 97.09 | 12428.06 | D:\DskSpd\testfile5.dat (200MB) 7 | 1003307008 | 122474 | 95.65 | 12243.32 | D:\DskSpd\testfile5.dat (200MB) ------------------------------------------------------------------------------ total: 8120410112 | 991261 | 774.16 | 99093.08 Write IO thread | bytes | I/Os | MB/s | I/O per s | file ------------------------------------------------------------------------------ 0 | 343506944 | 41932 | 32.75 | 4191.80 | D:\DskSpd\testfile5.dat (200MB) 1 | 340770816 | 41598 | 32.49 | 4158.41 | D:\DskSpd\testfile5.dat (200MB) 2 | 338477056 | 41318 | 32.27 | 4130.42 | D:\DskSpd\testfile5.dat (200MB) 3 | 336093184 | 41027 | 32.04 | 4101.33 | D:\DskSpd\testfile5.dat (200MB) 4 | 343187456 | 41893 | 32.72 | 4187.90 | D:\DskSpd\testfile5.dat (200MB) 5 | 336715776 | 41103 | 32.10 | 4108.93 | D:\DskSpd\testfile5.dat (200MB) 6 | 343040000 | 41875 | 32.70 | 4186.11 | D:\DskSpd\testfile5.dat (200MB) 7 | 334970880 | 40890 | 31.93 | 4087.64 | D:\DskSpd\testfile5.dat (200MB) ------------------------------------------------------------------------------ total: 2716762112 | 331636 | 259.00 | 33152.55pcmeiners
4 Operator
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November 29th, 2017 15:00
With raid 1, writes are not great if the array is moderate to heavily used as the cache is flooded, which causes writes to act as if there is little or no cache, Writes are written to one member of the array, completed, then written to the other member, causing considerable delays. As to reads, they are processed by one of the member disks, so there no great performance under a moderate to heavy load, Lightly load the raid cache helps with most of the delays.
Now raid 5 has more delays on writes due to the added burden of parity creation. On your testing you have a 25/75 ratio which is good. Raid 5 has a much higher read speed as it reads from multiple disk at once. Technically raid 5 is much better in this scenario. There are ways to setup multiple raid 1 arrays for databases which have a much higher performance, but it costs. Again, lightly load the raid cache, takes care of delays.
Now for more performance, a raid 10 would be a good choice, as the reads are from multiple member drives and the array adapter is less taxed then with raid 5..
Lastly, take benchmarks, especially the results from 1 program with a bit of healthy skepticism. Not only does the raid adapter parameter need adjusting for each type of raid, the operating system needs to be tweaked before benchmarking or going live.
You need to use multiple benchmark programs and a live situation using real data for proper performance evaluation.
Message for Dell......
I using Foxfire, v57 ,the reCAPTCHA asks for a ridiculous number of verifies. Is the idea to torture forum users, if so your right on the mark. Had to switch to MS Internet Explorer to get past the robot nonsense.
DELL-Josh Cr
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November 29th, 2017 15:00
There will be big changes to the forums soon that may address the reCAPTCHA issues.
pcmeiners
4 Operator
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November 30th, 2017 06:00
Thanks for the reply Josh.