Re: [squid-users] Reg: Migration of squid cache

On 08/29/2013 12:42 AM, Nehal J Wani wrote:
> On Thu, Aug 29, 2013 at 3:01 AM, Eliezer Croitoru <eliezer_at_ngtech.co.il> wrote:
>> On 08/29/2013 12:07 AM, Nehal J Wani wrote:
>>> On Thu, Aug 29, 2013 at 2:32 AM, Eliezer Croitoru <eliezer_at_ngtech.co.il> wrote:
>>>> On 08/28/2013 11:16 PM, Nehal J Wani wrote:
>>>>> I am using CentOS 6.4 and want to set up a new proxy server using
>>>>> squid. Can anybody help me with the steps to be followed for migrating
>>>>> cache?
>>>>>
>>>> What do you have now?
>>>> What do you aim for??
>>>> I have compiled new versions of squid for CentOS which is kind of an
>>>> upgrade to the current squid package that do exist.
>>>
>>> Oh no. I am using standard packages. Both are squid 3.1.10
>>>
>> OK
>>>> did you ever used squid before??
>>>
>>> Basically, I have to reconfigure the old server to add new partitions
>>> for extra space for logs and cache.
>>> Hence. temporarily, I am shifting to a new proxy. Therefore, I need to
>>> migrate the proxy cache.
>> OK so if you do have a new server then it depends on the load of the
>> server but if it's more then a basic server use a dedicated disk for
>> squid logs...
>> for many admins these logs are important so a raid volume\disk will
>> might be better.
>> LVM can ensure you the option to extend the size of the partition in a
>> case of a loaded server.
>>
>> For the cache_dir it's another story since there is a limit for the size
>> by the ram etc.
>> Can you share the current proxy specs and squid.conf??
>> you can strip down the confidential info and I will try my best to
>> understand and help you if I can..
>>
>> Eliezer
>
>
> I haven't migrated the cache completely as of yet. While copying the
> cache2 directory from old server,
> the RAID5 partition committed suicide. I have attached the output of
> fpaste --sysinfo.
>
>
>
OK this is pretty understandable..
it seems to me like more then just a small cache but I might be wrong...
there is a basic calculation of RAM VS DISK cache.
I dont remember now the calculation but I do remeber it's a FAQ.
take a peek at:
http://wiki.squid-cache.org/SquidFaq/ConfiguringSquid#What_.27.27cache_dir.27.27_size_should_I_use.3F

There is the question and calculation of how much RAM you can use..
The CPU is not an issue but squid DB which is residing in RAM takes up
space per number of objects.
I do Hope that AMOS later on will respond with the right calculation.
This is the right time to actually write a small script that will help
linux users calculate it.
There is a windows squidcalc if i'm right Program that can instruct you
how to configure the cache_dir size.
By the way take into account that the proxy might have been configured
wrongly for a very long period of time and this is indeed a good time to
tweak the right settings.
Yet I have seen the squid.conf so I was only referring to what I have
understood from the plain system info.

Eliezer
Received on Wed Aug 28 2013 - 22:00:12 MDT