[Deploying Sakai] Hardware Recommendations

[Sam Ottenhoff]

>
>
> App Servers are Two Xeons with 12M RAM
>
> DB Servers start with Two Xeons and 24M of RAM
>

Use enterprise SSD drives or FusionIO (http://www.fusionio.com/) drives and
you won't have to worry about database performance.


>
> In terms of growth of load, each app server (with 2 CPUs and 12M of RAM)
> supports 1000 logged in users.
>


Sounds right


>
> For each 1000 logged in users I will add 0.5 CPUs and 4M of RAM to my DB
> servers.  My initial DB server above will support 2000 logged in users and
> above 2000 I need to start adding RAM and CPUs.
>
> Is this model reasonable as a first approximation or is it crazy?  From my
> conversations I might be able to use 8GB RAM for the App Servers and maybe
> I need a touch more CPU per 1000 users on the DB side.
>

Disk speed (random reads / random writes) seems more important than
upgrading CPU on the database side.

Approximations sound  about right... maybe 50% more RAM per additional 1k
students than you have budgeted.


>
> I am still going round-n-round in my mind Oracle versus MySql.  If one
> requires far more or less hardware per logged in user - it might push me in
> a particular direction.
>


Oracle seems to handle some legacy sub-selects better.... a lot more
attention on MySQL from developers..... I don't think you will notice a big
difference in performance.

--Sam
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