nginx proxy MISS

[Slawa Olhovchenkov]

Есть файл, не меняется, заголовков про expire не имеет.

Response: {'status': 200, 'headers': {'content-length': '615700', 'x-rgw-object-type': 'Normal', 'accept-ranges': 'bytes', 'last-modified': 'Wed, 08 Jul 2020 01:35:48 GMT', 'connection': 'Keep-Alive', 'etag': '"1f722dbb169b83ea4f5897d638d39c8d"', 'x-amz-request-id':
 'tx00000000000000451618a-005f306158-a6edb7b-default', 'date': 'Sun, 09 Aug 2020 20:49:28 GMT', 'content-type': 'video/MP2T'}, 'reason': 'OK'}
 
188.242.226.75 :62964 [30/Jul/2020:21:01:48 +0300]  "GET /720p_02815.ts HTTP/1.1" 200 616330 MISS 0.000 0.016 616206
212.164.64.179 :6700 [30/Jul/2020:21:01:50 +0300]   "GET /720p_02815.ts HTTP/1.1" 200 616330 HIT - - -
109.94.87.178 :56019 [30/Jul/2020:21:01:51 +0300]   "GET /720p_02815.ts HTTP/1.1" 200 616330 HIT - - -
165.225.66.51 :3581 [30/Jul/2020:21:01:46 +0300]    "GET /720p_02815.ts HTTP/1.1" 200 616330 MISS 0.000 0.043 616196
176.59.135.87 :41598 [30/Jul/2020:21:01:47 +0300]   "GET /720p_02815.ts HTTP/1.1" 200 616330 HIT - - -
178.184.45.0 :45255 [30/Jul/2020:21:01:50 +0300]    "GET /720p_02815.ts HTTP/1.1" 200 616330 HIT - - -
85.26.233.17 :6656 [30/Jul/2020:21:01:59 +0300]     "GET /720p_02815.ts HTTP/1.1" 200 616330 HIT - - -
91.214.220.143 :43841 [30/Jul/2020:21:01:59 +0300]  "GET /720p_02815.ts HTTP/1.1" 200 616330 HIT - - -
128.71.141.232 :57462 [30/Jul/2020:21:02:31 +0300]  "GET /720p_02815.ts HTTP/1.1" 200 616330 HIT - - -
5.167.161.39 :64139 [30/Jul/2020:21:02:36 +0300]    "GET /720p_02815.ts HTTP/1.1" 200 616316 HIT - - -
95.105.98.204 :49869 [30/Jul/2020:21:02:34 +0300]   "GET /720p_02815.ts HTTP/1.1" 200 616316 MISS 0.000 0.020 616032

какие причины могут быть для возникновения MISS?

зона не заполнена даже наполовину.
proxy_cache_path /cache keys_zone=RGW:1000m levels=2:2 max_size=6000g inactive=10d use_temp_path=off;