有人能解释一下avgqu-sziostat 输出中的意思吗？手册页是这样的。
avgqu-sz:
The average queue length of the requests that were issued to the device.
有人能帮助我进一步理解这一点吗？
在我的一个开发设置中，我观察到了如下avgqu-sz所示的值。所有列值都是每小时 95 百分位的值。有人能帮我理解它avgqu-sz与其他 iostat 字段（如r_await、、、等）的关系吗？w_awaitr/sw/s
timestamp r/s w/s r_await w_await avgqu-sz
0 2020-04-25 00:53:59.249999872 4435.01 8310.81 3.6800 4.0600 13.9630
1 2020-04-25 01:53:59.249999872 5943.15 7308.96 3.7515 3.8610 12.9740
2 2020-04-25 02:53:59.249999872 4573.45 11083.89 3.1805 3.6810 14.8125
3 2020-04-25 03:53:59.249999872 4561.46 10301.63 4.1515 3.1830 18.7635
4 2020-04-25 04:53:59.249999872 3330.91 8764.82 7.0130 2.7810 16.7215
5 2020-04-25 05:53:55.500000000 4864.52 8316.68 4.9310 3.0810 14.2320
6 2020-04-25 06:53:55.249999872 5503.61 6356.95 4.1220 2.7810 12.5010
7 2020-04-25 07:02:32.500000000 4759.70 6532.80 3.2750 4.5400 15.4650
8 2020-04-24 08:56:58.249999872 4959.69 6939.54 2.7510 5.3245 14.9455
9 2020-04-24 09:56:58.249999872 1929.14 6888.51 2.9305 2.6310 13.0260
10 2020-04-24 10:56:58.249999872 2814.69 7053.62 2.9200 2.6410 14.2835
11 2020-04-24 11:56:58.249999872 4270.01 6513.56 1.5305 1.6500 13.1110
12 2020-04-24 12:56:59.249999872 9818.74 6061.77 1.7100 3.6725 20.5005
13 2020-04-24 13:56:59.249999872 6318.94 8868.55 1.5800 3.0890 15.8160
14 2020-04-24 14:56:59.249999872 5177.97 7995.32 1.7810 2.1300 14.1155
15 2020-04-24 15:56:59.249999872 4031.30 8081.75 1.8205 1.7010 12.9030
16 2020-04-24 16:56:59.249999872 2508.38 7748.61 1.8405 1.5405 11.9430
17 2020-04-24 17:56:59.249999872 3878.49 9050.67 2.0405 1.7410 15.3910
18 2020-04-24 18:56:59.249999872 4269.47 8221.51 2.2805 1.6200 14.6525
19 2020-04-24 19:56:59.249999872 3592.69 7610.89 1.7705 1.7510 13.4725
20 2020-04-24 20:56:59.249999872 6622.17 7555.09 2.9405 2.8940 17.3830
21 2020-04-24 21:56:59.249999872 5120.35 7667.93 1.8810 2.3420 13.4915
22 2020-04-24 22:56:59.249999872 3242.21 8541.93 1.4305 1.4800 11.9405
23 2020-04-24 23:56:59.249999872 3238.35 7517.56 1.5310 1.8220 10.8105