Search squid archive

Re: about the cache and CARP

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 23/08/11 21:37, Matus UHLAR - fantomas wrote:
On 16.08.11 16:54, Carlos Manuel Trepeu Pupo wrote:
I want to make Common Address Redundancy Protocol or CARP with two
squid 3.0 STABLE10 that I have, but here I found this question:

the CARP that squid supports is the "Cache Array Routing Protocol"
http://en.wikipedia.org/wiki/Cache_Array_Routing_Protocol

- this is something different than "Common Address Redundancy Protocol"
http://en.wikipedia.org/wiki/Common_Address_Redundancy_Protocol

Well, technically Squid supports both. Though we generally don't use the term CARP to talk about the OS addressing algorithms. HA, LVS or NonStop are usually mentioned directly.


If the main Squid with 40 GB of cache shutdown for any reason, then
the 2nd squid will start up but without any cache.

There is any way to synchronize the both cache, so when this happen
the 2nd one start with all the cache ?

You would need something that would synchronize squid's caches,
otherwise it would eat two times the bandwidth.

Seconded.

If the second Squid is not running until the event the cache can be safely mirrored. Though that method will cause a slow DIRTY startup rather than a fast not-swap. On 40GB it could be very slow, and maybe worse than an empty cache.

NP: the traffic spike from an empty cache decreases in exponential proportion to the hit ratio of the traffic. From a spike peak equal to the internal bandwidth rate.

PS. I have a feeling you might have some graphs to demonstrate that spike effect Carlos. Would you be able to share the images and numeric details? I'm looking for details to update the 2002 documentation.

Amos
--
Please be using
  Current Stable Squid 2.7.STABLE9 or 3.1.14
  Beta testers wanted for 3.2.0.10


[Index of Archives]     [Linux Audio Users]     [Samba]     [Big List of Linux Books]     [Linux USB]     [Yosemite News]

  Powered by Linux