Sorry everyone about the multiple posts with the same content...
My own posts weren't coming to me at all through email...
I just checked
http://mailman.nginx.org/pipermail/nginx/2015-July/thread.html
and found out all my posts were posted.

Again I apologize for the inconvenience.

:(

It was sincerely a mistake.


On Mon, Jul 27, 2015 at 12:29 AM, highclass99 <highclass99@gmail.com> wrote:

> I have server A with a large HDD at IDC 1 (TB hdd)
> I have server B with cheap bandwidth at IDC 2 (very small virtual server
> 20 GB hdd)
>
> I send all image requests to server B, and it caches from A.
> My problem is that on server IO is really high
>
> Server B iostat
> Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz
> avgqu-sz await svctm %util
> sda 34.01 517.21 1263.36 76.72 19922.27 4751.42 18.41
> 2.95 2.20 0.36 47.67
> sda1 0.00 0.00 0.00 0.00 0.00 0.00 0.00
> 0.00 0.00 0.00 0.00
> sda2 34.01 517.21 1263.36 76.72 19922.27 4751.42 18.41
> 2.95 2.20 0.36 47.67
> dm-0 0.00 0.00 1297.37 593.93 19922.27 4751.42 13.05
> 8.78 4.64 0.25 47.71
> dm-1 0.00 0.00 0.00 0.00 0.00 0.00 0.00
> 0.00 0.00 0.00 0.00
>
> Here is my related nginx config
> --------------- cut --------------------------------------
> proxy_cache_path /cache levels=1:2
> keys_zone=MEDIA:200m
> inactive=2d max_size=6g;
> --------------- cut --------------------------------------
> location / {
> proxy_pass http://SERVER_A http://server_a/
> proxy_cache MEDIA;
> proxy_cache_key "$scheme$request_uri";
>
> proxy_cache_valid 200 302 304 7d;
> proxy_cache_valid 301 1h;
> proxy_cache_valid any 1m;
> proxy_cache_use_stale error timeout invalid_header http_500
> http_502 http_503 http_504 http_404 updating;
> proxy_ignore_headers Cache-Control Expires
> Set-Cookie;
> proxy_cache_min_uses 3;
> proxy_cache_revalidate on;
> proxy_cache_lock on;
> proxy_cache_lock_timeout 15s;
>
> expires 7d;
> }
> --------------- cut --------------------------------------
>
> Server B has nothing else running.
> Server B is sending about 200~400 MBs traffic outside
> Is such a high IO load normal?
> Is there a way I can decrease the IO load while keeping the caching of
> server B efficient?
>
> Thank you.
>
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