Background: Our partner was planning for the hardware specifications for a search application.
It is disk I/O bound.
Problem: Should they use RAID 0 on 6 SCSI drives, or use their existing
SAN (Storage Area Network) for the storage?
They already have results for the SAN, which
was comparable to results for a single 10K RPM SCSI drive. However, they do not have a server
with 6 SCSI drives to test out. How well does RAID 0 on U320 direct attached storage scale?
We came in the picture, as we have spare servers, and spare storage.
The results are as follows:
No. of Drives
(RAID 0) |
Sequential
Output (Block) K/Sec |
Sequential
Output (Rewrite) K/sec |
Sequential
Input (Block) K/sec |
Random Seeks
/sec |
| 1 | 69110 | 39903 | 84839 | 646.2 |
| 2 | 122336 | 65553 | 155875 | 956 |
| 3 | 143485 | 73467 | 175162 | 1134 |
| 4 | 151223 | 77878 | 174961 | 1273 |
| 5 | 161652 | 81556 | 177173 | 1326 |
| 6 | 168379 | 87636 | 183342 | 1451 |
1 Drive (146GB 10K RPM)
Version 1.93c ------Sequential Output------ --Sequential Input- --Random-
Concurrency 1 -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
localhost.locald 4G 240 99 69110 31 39903 15 979 98 84839 19 646.2 12
Latency 37580us 1079ms 1394ms 39491us 18883us 632ms
Version 1.93c ------Sequential Create------ --------Random Create--------
localhost.localdoma -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
16 2331 95 +++++ +++ +++++ +++ 2569 97 +++++ +++ 9275 92
Latency 33804us 62us 60us 39865us 20us 2635us
1.93c,1.93c,localhost.localdomain,1,1173079504,4G,,240,99,69110,31,39903,15,
979,98,84839,19,646.2,12,16,,,,,2331,95,+++++,+++,+++++,+++,2569,97,+++++,
+++, 9275,92,37580us,1079ms,1394ms,39491us,18883us,632ms,33804us,62us,60us,
39865us, 20us,2635us
2 Drives (146GB 10K RPM) RAID 0
Version 1.93c ------Sequential Output------ --Sequential Input- --Random-
Concurrency 1 -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
localhost.locald 4G 234 99 122336 53 65553 26 896 96 155875 36 956.0 20
Latency 37791us 870ms 947ms 94783us 18743us 261ms
Version 1.93c ------Sequential Create------ --------Random Create--------
localhost.localdoma -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
16 2501 97 +++++ +++ +++++ +++ 2499 97 +++++ +++ 9683 92
Latency 29504us 40us 174us 23272us 20us 2533us
1.93c,1.93c,localhost.localdomain,1,1173092942,4G,,234,99,122336,53,65553,26,
896,96,155875,36,956.0,20,16,,,,,2501,97,+++++,+++,+++++,+++,2499,97,+++++,
+++, 9683,92,37791us,870ms,947ms,94783us,18743us,261ms,29504us,40us,174us,
23272us, 20us,2533us
3 Drives (146GB 10K RPM) RAID 0
Version 1.93c ------Sequential Output------ --Sequential Input- --Random-
Concurrency 1 -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
localhost.locald 4G 265 99 143485 59 73467 29 1100 99 175162 40 1134 22
Latency 33781us 1517ms 901ms 16954us 17388us 220ms
Version 1.93c ------Sequential Create------ --------Random Create--------
localhost.localdoma -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
16 2176 97 +++++ +++ +++++ +++ 2224 98 +++++ +++ 9864 92
Latency 17538us 41us 58us 18929us 45us 2957us
1.93c,1.93c,localhost.localdomain,1,1173092470,4G,,265,99,143485,59,73467,29,
1100,99,175162,40,1134,22,16,,,,,2176,97,+++++,+++,+++++,+++,2224,98,+++++,
+++, 9864,92,33781us,1517ms,901ms,16954us,17388us,220ms,17538us,41us,58us,
18929us, 45us,2957us
4 Drives (146GB 10K RPM) RAID 0
Version 1.93c ------Sequential Output------ --Sequential Input- --Random-
Concurrency 1 -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
localhost.locald 4G 242 99 151223 64 77878 32 991 96 174961 41 1273 28
Latency 36060us 868ms 1010ms 94718us 25317us 401ms
Version 1.93c ------Sequential Create------ --------Random Create--------
localhost.localdoma -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
16 2243 97 +++++ +++ +++++ +++ 2423 97 +++++ +++ 9872 93
Latency 15938us 45us 54us 26997us 21us 2859us
1.93c,1.93c,localhost.localdomain,1,1173094078,4G,,242,99,151223,64,77878,32,
991,96,174961,41,1273,28,16,,,,,2243,97,+++++,+++,+++++,+++,2423,97,+++++,
+++, 9872,93,36060us,868ms,1010ms,94718us,25317us,401ms,15938us,45us,54us,
26997us, 21us,2859us
5 Drives (146GB 10K RPM) RAID 0
Version 1.93c ------Sequential Output------ --Sequential Input- --Random-
Concurrency 1 -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
localhost.locald 4G 247 99 161652 69 81556 34 1008 99 177173 42 1326 28
Latency 36168us 865ms 945ms 20790us 24184us 487ms
Version 1.93c ------Sequential Create------ --------Random Create--------
localhost.localdoma -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
16 2343 97 +++++ +++ +++++ +++ 2207 98 +++++ +++ 9306 93
Latency 18566us 36us 52us 16534us 32us 2687us
1.93c,1.93c,localhost.localdomain,1,1173093546,4G,,247,99,161652,69,81556,34,
1008,99,177173,42,1326,28,16,,,,,2343,97,+++++,+++,+++++,+++,2207,98,+++++,
+++, 9306,93,36168us,865ms,945ms,20790us,24184us,487ms,18566us,36us,52us,
16534us, 32us,2687us
6 Drives (146GB 10K RPM) RAID 0
Version 1.93c ------Sequential Output------ --Sequential Input- --Random-
Concurrency 1 -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
localhost.locald 4G 248 99 168379 72 87636 35 969 96 183342 44 1451 31
Latency 33562us 912ms 1374ms 102ms 14077us 254ms
Version 1.93c ------Sequential Create------ --------Random Create--------
localhost.localdoma -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
16 2500 98 +++++ +++ +++++ +++ 2271 99 +++++ +++ 10091 97
Latency 10374us 43us 60us 12506us 20us 303us
1.93c,1.93c,localhost.localdomain,1,1173114597,4G,,248,99,168379,72,87636,35,
969,96,183342,44,1451,31,16,,,,,2500,98,+++++,+++,+++++,+++,2271,99,+++++,
+++, 10091,97,33562us,912ms,1374ms,102ms,14077us,254ms,10374us,43us,60us,
12506us, 20us,303us
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