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Capacity Planning as a Performance Tuning Tool—Case Study for a Very Large Database Environment

Sep 19, 2003

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Data Tables

TABLE 3, TABLE 4, and TABLE 5 list the data collected in this case study.

TABLE 3 Disk and CPU Utilization Data

ssdl183			ssdl187			ssdl197			ssd311			cpu
rps	wps	util	rps	wps	util	rps	wps	util	rps	wps	util	us	sy	wt	Id
299	0	100.0	161	0	85.0	133	14	79.1	137	0	89.0	11	13	75	1
263	0	100.0	139	1	88.4	140	25	81.1	140	0	87.7	9	11	79	1
278	1	99.0	153	0	87.8	116	27	76.1	136	1	88.1	9	8	82	0
271	0	98.9	169	1	90.8	154	31	83.0	149	0	90.6	9	8	83	0
272	0	100.0	151	0	87.6	127	49	77.0	148	0	84.6	8	7	85	0

TABLE 4 Disk Busy Percentage and Average Service Time Data

device	%busy	avque	r+w/s	blks/s	avwait	avserv
ssd92,e	69	1.2	139	4457	0.0	8.6
ssd129	94	2.8	201	6434	0.0	14.0
ssd129,e	94	2.8	201	6434	0.0	14.0
ssd156	81	1.7	147	3703	0.0	11.6
ssd156,e	81	1.7	147	3703	0.0	11.6
ssd166	46	0.9	92	2950	0.0	9.2
ssd166,e	46	0.9	92	2950	0.0	9.2
ssd167	94	4.0	217	6936	0.0	18.5
ssd167,e	94	4.0	217	6936	0.0	18.5
ssd178,e	67	1.2	125	3986	0.0	9.4
ssd183	100	15.4	263	14829	0.0	58.4
ssd183,e	100	15.4	263	14829	0.0	58.4
ssd184	23	0.3	25	785	0.0	11.6
ssd187	91	2.8	138	4425	0.0	19.9
ssd187,e	91	2.8	138	4425	0.0	19.9
ssd189	31	0.4	27	879	0.0	14.1
ssd189,e	31	0.4	27	879	0.0	14.1
ssd191	92	3.8	191	6120	0.0	19.8
ssd191,e	92	3.8	191	6120	0.0	19.8

where:

us is the percentage of time the CPU spends running the user application.

sy is the percentage of time the CPU spends controlling the system.

wt is the percentage of time the CPU spends waiting for the disks to complete I/O.

Id is the percentage of time the CPU is idle. Subtracting this number from 100 will give the percent utilization.

%busy is how busy the disk drives are.

avque is the average number of I/Os that are waiting in queue to be serviced.

r+w/s is the total number of reads and writes (I/Os) done by the disks in the time interval chosen.

blks/s is the number of blocks per second transferred; the block length is usually 512 bytes or a multiple of 512 bytes.

TABLE 5 TNF Output Data

	i/o rate	read pct	maximum iint_arr	average iint_arr	std_dev iint_arr	maximum resp_tme	average resp_tme	std_dev resp_tme	xfer size	maxq depth	avg random qdepth	busy %	%
total	3291.5	97.9	5.40	0.30	0.39	250.77	22.11	22.50	22152	124	72.80	75.56	100.00
c12t50020F2300006A96d0s4	170.9	99.9	202.58	5.83	13.02	187.35	34.57	28.79	38816	28	5.91	23.62	83.25
c12t50020F2300006AFDd0s4	168.6	83.3	58.82	5.92	6.56	42.07	10.88	5.27	13071	22	1.83	85.50	77.40
c12t50020F2300006BFCd0s4	176.1	99.9	125.78	5.67	8.14	129.38	21.84	14.67	28399	27	3.84	57.58	86.27
c12t50020F23000079F7d0s4	179.8	99.9	63.79	5.55	6.41	66.91	19.33	7.74	16539	21	3.47	99.72	91.77
c12t50020F23000084C9d0s4	24.3	99.4	428.91	41.05	52.55	39.96	14.12	4.44	16336	4	0.34	99.71	28.65
c12t50020F23000084D9d0s4	151.5	99.9	86.82	6.59	7.28	65.63	20.07	7.53	16421	17	3.04	99.60	90.41
c13t50020F2300003503d1s4	29.9	99.3	353.22	33.33	39.00	31.19	9.71	4.00	16333	5	0.29	99.34	24.50
c13t50020F2300003E49d0s4	270.2	99.9	79.76	3.69	6.46	250.77	58.03	39.62	28656	42	15.68	40.48	99.27
c13t50020F23000059EEd0s4	141.6	99.9	84.13	7.05	7.83	83.78	19.15	7.02	16454	15	2.71	99.44	88.62
c13t50020F2300006C3Bd1s4	84.4	99.7	101.14	11.82	12.28	46.46	9.70	3.76	16607	11	0.81	99.19	52.11
c14t50020F230000BF7Ed0s4	17.9	95.0	528.77	55.24	66.18	49.55	10.58	5.07	16121	5	0.19	99.13	16.72
c14t50020F230000C18Dd0s4	19.6	99.5	534.99	50.81	59.42	42.35	11.93	4.11	16348	4	0.23	99.85	20.64
c14t50020F230000DDD0d0s4	67.1	99.7	187.87	14.86	16.31	39.74	9.22	3.40	16607	10	0.61	99.20	42.32
c14t50020F230000E17Cd0s4	13.9	99.0	1155.20	71.57	93.39	36.89	9.99	4.45	16475	4	0.13	98.98	12.56
c15t50020F2300004442d0s4	22.6	99.6	448.67	43.96	52.30	38.18	13.47	4.41	16334	4	0.30	99.93	25.89
c15t50020F23000097ACd0s4	199.3	99.9	54.94	5.01	5.94	66.57	17.57	7.73	16412	23	3.50	99.39	90.17
c15t50020F23000097ACd1s4	87.8	99.9	106.51	11.37	12.43	39.06	8.52	3.21	16376	11	0.74	99.71	49.53
c16t50020F230000528Cd0s4	3.8	97.0	1876.53	260.92	392.30	35.89	5.67	5.30	16748	2	0.02	97.77	2.13
c16t50020F23000069B0d0s4	55.7	99.5	240.65	17.93	23.01	32.98	12.72	4.00	16322	7	0.70	99.59	49.21
c16t50020F230000BDF5d0s4	30.2	99.5	346.84	33.04	40.45	53.23	12.27	4.65	16345	4	0.37	99.76	30.00
c17t50020F2300005720d1s4	174.3	82.6	82.12	5.73	6.32	42.94	10.69	5.22	12997	32	1.86	84.44	78.04
c17t50020F230000629Bd1s4	5.8	43.9	3817.82	169.20	366.20	35.45	8.31	5.29	34241	11	0.04	56.79	3.40
c17t50020F2300006ADEd1s4	221.9	99.9	79.71	4.50	6.76	158.83	28.91	20.97	28627	36	6.41	51.05	93.78
c17t50020F2300006C1Bd1s4	210.6	99.9	190.50	4.73	10.56	243.25	36.53	30.79	38451	34	7.69	22.94	89.09
c17t50020F2300007C4Ad1s4	14.9	98.9	759.66	66.88	92.67	43.80	12.66	5.19	16433	4	0.18	97.54	16.51
c17t50020F23000086B7d1s4	26.4	99.6	483.71	37.76	46.38	45.23	14.97	4.37	16340	5	0.39	99.84	32.35
c18t50020F2300004359d1s4	74.5	99.8	130.16	13.40	13.99	40.73	11.42	4.23	16491	12	0.85	98.99	55.09
c19t50020F230000A6B7d1s4	4.0	97.5	2534.77	245.34	390.26	31.79	5.91	5.53	16185	2	0.02	97.92	2.39
c19t50020F230000B56Cd1s4	88.0	99.7	121.12	11.34	11.76	58.36	15.74	6.51	16379	9	1.38	99.47	71.46
c19t50020F230000C01Cd1s4	18.9	98.8	677.92	52.63	66.50	37.31	11.54	4.09	16286	3	0.21	99.62	19.23
c7t50020F2300003BDEd1s4	123.5	99.8	805.88	8.07	23.61	195.14	31.30	25.04	42903	24	3.86	17.35	66.57
c7t50020F230000514Fd1s4	30.9	99.4	815.84	32.26	45.45	47.66	15.33	4.27	16339	4	0.47	99.63	37.45
c7t50020F230000647Dd0s4	189.4	99.9	51.30	5.27	5.65	54.09	14.25	5.71	16489	17	2.70	99.19	89.07
c8t50020F230000A6BEd1s4	2.0	96.5	4325.08	481.07	745.10	40.51	8.45	4.55	16099	2	0.01	99.30	1.70
c8t50020F230000BCB0d1s4	110.5	99.8	71.93	9.04	9.28	35.24	9.57	3.76	16603	13	1.05	99.18	61.34
c8t50020F230000C0F4d1s4	16.9	99.1	477.62	58.80	70.83	47.08	11.78	4.08	16316	5	0.20	99.58	17.75
c8t50020F230000DF81d1s4	17.1	99.4	781.56	58.19	90.76	34.54	8.60	4.37	16336	3	0.14	99.50	13.74
c8t50020F230000E37Ed1s4	44.1	99.7	197.25	22.61	24.94	38.05	9.67	3.80	16619	10	0.42	99.04	31.20
Controller No.
c_7	344.0	99.8	49.38	2.90	3.76	195.14	20.47	17.62	25963	34	7.04	75.56	97.81
c_8	190.8	99.7	57.60	5.23	5.59	47.08	9.69	3.93	16552	14	1.85	75.56	81.10
c_12	871.5	96.6	17.90	1.14	1.51	187.35	21.17	17.10	22608	51	18.45	75.56	99.98
c_13	526.3	99.8	30.31	1.89	2.57	250.77	37.06	36.02	22737	46	19.50	75.56	99.96
c_14	118.7	98.9	100.69	8.40	9.41	49.55	9.96	4.07	16472	13	1.18	75.56	66.78
c_15	310.0	99.8	40.19	3.22	3.65	66.57	14.70	7.69	16393	26	4.55	75.56	96.23
`c_16`	`89.8`	`99.2`	`149.04`	`11.11`	`12.89`	`53.23`	`12.25`	`4.53`	`16332`	`8`	`1.10`	`75.56`	`65.09`
c_17	654.2	94.7	24.75	1.52	2.16	243.25	25.39	23.99	26898	55	16.61	75.56	99.88
c_18	74.6	99.6	130.16	13.38	13.98	40.73	11.41	4.25	16477	12	0.85	75.56	55.10
c_19	111.1	99.4	121.12	8.98	9.66	58.36	14.65	6.57	16344	9	1.62	75.56	77.42

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