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Why capacity planning ?

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  Why capacity planning ? aminer <aminer@toto.net> - 2013-11-10 13:35 -0800
    Re: Why capacity planning ? aminer <aminer@toto.net> - 2013-11-10 13:41 -0800

#4009 — Why capacity planning ?

Hello,

Question:

But what is the purpose of the capacity planning using the queuing theory ?


Answer:

You have to be very carefull, if for example you are using a database
with your webserver and you are accessing this database from internet or 
intranet and you are doing reads and writes and deletes transactions on 
this database and after that the data of the databse is served through 
internet or intranet , as i told you you can use a worst case scenario 
cause the database queing node has an hyperexponential on its service 
side, so you can choose the worst case scenario, so if the reads takes 
much more time than the writes and deletes, you have to choose only the 
rate of the writes transactions , the rate means how many writes per 
second, as your lambda, but notice with me that the network node or the 
intranet node of your network is markovian, so if for example the 
bandwidth of your network internet connection is 30Mbps, since it's an 
M/M/1 markovian queuing node that means that the bandwidth will be 
reduced by 50% cause the Knee of the M/M/1 internet network queuing node 
is reached at 50%, and don't forget also
about the TCP/IP protocol overhead of ~20% , so  you have to be carefull 
when you do capacity planning..

And why you have to do capacity planning ? cause if you must
ensure a quality of service and set a constraint on the maximum waiting 
time, let for example say 5 seconds for each internet user to receive
it's webpage, you have to do capacity planning to set the maximum number 
of connections ofyour webserver correctly and do your analytic queuing 
network calaculations or you queuing network simulation.



Thank you
Amine Moulay Ramdane.

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#4010

I correct please read again...

Hello,

Question:

But what is the purpose of the capacity planning using the queuing theory ?


Answer:

You have to be very carefull, if for example you are using a database
with your webserver and you are accessing this database from internet or 
intranet and you are doing reads and writes and deletes transactions on 
this database and after that the data of the databse is served through 
internet or intranet , as i told you you can use a worst case scenario 
cause the database queuing node has an hyperexponential on its service 
side, so you can choose the worst case scenario, so if the reads takes 
much more time than the writes and deletes, you have to choose only the 
rate of the reads transactions , the rate means how many reads 
transactions per second, as your lambda, but notice with me that the 
network node or the intranet node of your network is markovian, so if 
for example the bandwidth of your network internet connection is 30Mbps, 
since it's an M/M/1 markovian queuing node that means that the bandwidth 
will be reduced by 50% cause the Knee of the M/M/1 internet network 
queuing node is reached at 50%, and don't forget also
about the TCP/IP protocol overhead of ~20% , so  you have to be carefull 
when you do capacity planning..

And why you have to do capacity planning ? cause if you must
ensure a quality of service and set a constraint on the maximum waiting 
time, let for example say 5 seconds for each internet user to receive
it's webpage, you have to do capacity planning to set the maximum number 
of connections of your webserver correctly and do your analytic queuing 
network calculations or your queuing network simulation.



Thank you
Amine Moulay Ramdane.

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