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4

Some of this has been covered here before... and here, too. I can't think of any situation where you wouldn't want a battery-backed or flash-backed cache unit on your hardware RAID controller. It's what makes write caching possible. See: BBWC: in theory a good idea but has one ever saved your data? If your system panics suddenly, the question as to what ...


3

A "real" hardware RAID controller (not a "fake" RAID that relies on the host CPU) is a freestanding computer separate from the host computer in which it's installed. A hardware RAID controller will handle reading/writing from the disks as the operating system makes requests, but it does not specifically rely on anything running inside the host computer ...


2

Yes, redundant power, while reducing the need for a BBU, does not eliminate that need. Consider the case where you wire up A/B power incorrectly, for example. The additional cost for a BBU is usually worth it where your data matters e.g. storage node, DB, etc.


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did you try moving cookie check before if (!req.backend.healthy) { block (which might unset cookies)? Or you may want (at least for test) making cache per-cookie (so it will not serve wrong content for logged in users): sub vcl_hash { hash_data(req.http.cookie); } see docs for more granular approach. It might be worth checking vcl_hash if you have ...


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Thank you for including your domainname, that makes answering such things easier possible. A quick check shows me: www.royaledecasa.com. 86400 IN A 50.22.12.12 Which has a DNS cache and therefore timeout of 86400 seconds, or 24 hours. That is how long it will take for cached DNS entries around the world to expire. Some will expire before others. ...


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I believe you are misunderstanding the ZIL purpose. You describe it as a write cache which it is not. No activity on the ZIL might just be a normal behavior depending on what is running on your machine. Nothing is ever anything read from the ZIL, this is a write only device outside possibly at mount time after a crash. There are only writes to it if ...


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- How do I set custom variables based on regexp against a useragent? Use a map. For instance : map $http_user_agent $my_var { default "default_value"; "~^foo$" "value_1"; "~^bar$" "value_2"; } - How do I set custom headers for the reverse-proxy request? Use proxy_set_header. For example : proxy_set_header My-Header $my_var; - ...


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In some website, if you switch from HTTP to HTTPS version, you should inform the the website configuration like 'Hey, we are served through HTTPS now'. Well, the reason is some website has hard-coded configuration to their static file URL generator. So, even they are served through HTTPS, the static-resources-URL generator still thinks that we are talking ...



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