[squid-users] R: [squid-users] R: [squid-users] cache size and structure

>Exactly, and vice versa. If they can connect to each other. And, if they
>are not behind slow links, although it's probably they are (otherwise there
>would be no need for 3 caches, right?)

The reason for 3 caches (1 parent + 2 child) because I have about 1700
Windows clients along area of about 60-70 miles, which I divided into 3
zones (A,B,C):

Squid parent A is necessary for 1st zone
Squid child B is necessary for 2nd zone
Squid child C is necessary for 3rd zone

My network has 2 star centers (1st zone-A, 3rd zone-C) which are linked
together by 6 Mbps link; 2nd zone (B) is a branch of 1st zone (A) and it's
linked to it by 11 Mbps.
There is a unique Internet link (50Mbps) and it's located where there is 1st
zone (A), so Squid A is the PARENT.
Both 1st and 3rd zone has several branches (links from 128 Kbps until 1
Mbps), being network stars, so Squid A,C serve many clients:

                        Child B
                    2nd zone
                    11 Mbps
                    600 users
                -----
Parent A
1st zone
50 Mbps
800 users
                -----
                    Child C
                    3rd zone
                        6 Mbps
                    300 users
            

Squid A serves about 800 users and squid B,C
Squid B serves about 600 users
Squid C serves about 300 users

This is reason for having 3 caches, what do you think my child caches
configured as neighbours to each other ?

-----Messaggio originale-----
Da: Matus UHLAR - fantomas [mailto:uhlar_at_fantomas.sk]
Inviato: Thursday, July 02, 2009 5:36 PM
A: squid-users_at_squid-cache.org
Oggetto: Re: [squid-users] R: [squid-users] cache size and structure

>> No, it is not. It may be 1mbps .OR. 76GB for week. it can't be anything
>> "per second for week". You may mean 1mbps during weekdays, 1mbps during
>> the whole week, 1mbps average.

On 30.06.09 19:06, Riccardo Castellani wrote:
> I want to say if weekly average of http traffic is 1 Mbps (monitored by
> mrtg tools), all http traffic, which goes to my squid, is 76 GB in a
> week.

Aha. So, you should have 76-152 GiB of disk cache on a few fast disks, if
you can afford that... along with a few gigs fo ram.

don't put too much of cache on one disk, it can slow you down. You can start
with e.g. 15GiB and increase by time, until you'll notice increase fo
response times. In such case, keep the L1 on 128.

> infact mrtg gives me these information:
> maximum peak for day
> traffic average for day
> ...for week
> ...for month
>
> Do you understand my calculates ?
>
>> ok, are your child caches configured as neighbours to each other?
>
> both squid (B,C) have configured as parent cache squid A
> I don't know what means "configured as neighbours to each other". Do you
> reference B as neighbours to C ?!

Exactly, and vice versa. If they can connect to each other. And, if they are
not behind slow links, although it's probably they are (otherwise there
would be no need for 3 caches, right?)

-- 
Matus UHLAR - fantomas, uhlar@fantomas.sk ; http://www.fantomas.sk/
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