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["Niels Dettenbach (Syndicat IT&Internet)" <nd AT syndicat.com>]

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Peter Green <peter AT greenpete.co.uk> schrieb:

>dedicated T2
>but am concerned about the RAM not being enough, 64MB burstable to
>128MB.

I did not know V.P.S.s infrastructure, machines and hosting politics, so i 
will answer in a general way here...


>I gather that BIND is relatively light weight and doesn't need much to
>run on, but
>what do you guys (and girls???) think?

This highly depends from the amount of zones that bind has (possibly) to 
handle (and/or to cache) - depending from what you use the bind for at all - 
and the amount of requests per seconds you want to serve with and (not at 
least) if you run more then your bind beside in that VM.

128 MB could be (much) more then enough (less then 128MB i did not tried yet 
in the past), but there are other often more important factors when using 
somekind of VM product from any eco hoster, i.e. i/o troughputs, CPU 
capacities behind, the underlying virtualization infrastructure and even 
bandwidth and bandwidth quality. From my experience most VMs available from 
eco hosters has very limitited capacities beside that what they write onto 
their products and use relatively "poor" hardware per user/product, very 
often just cheaper PC based hardware. Many hosters i've found are not deeper 
experienced with their virtualization product, using suboptimal 
configurations. Beside that, full virtualizations are comparably inefficient.

You could be "lucky" if he uses i.e. at least standard entry servers like HP 
DL1xx or similiar IBM machines as hardware. HP DL3xxx or 5xxx (do not know 
current IBMs product line) could render more throughput aso.. and even Dell 
is acceptable...

Don't calculate on "bursts" as you will did not get them any / most time you 
need it and the burst part could not be usable part for any FS buffers. As 
i/o often is main bottleneck your binds data/buffers should "fit into" the 
dedicated RAM. Avoid swapping at all...


So the only thing you can do:

- - look for a VM product which is ideally described in very detail 
(hardware, manufacturer/model, maximum usage etc. and - same important - 
details about the IP upstream). Loyal hosting ISPs are transparent there).

OR

- - try it!
means: install your target setup, run and/or benchmarking it and monitor it 
in details like Load, Response times, Mem details, i/o statistics etc.

But be aware of the results from timely limited demos before a buy as i know 
from different providers that this products could not be compared with what 
you get after buy in many cases, for different reasons...

And - not at least - things may (and usually will!) change any time in the 
future if i.e. new/other customers gets onto the same machine or change their 
usage profile/load profile or the ISP changes underlying hardware etc...

btw: dnstop could be a very helpful tool to view into the current work of 
your bind. Monitoring/ressource graphing should be done on another machine / 
from outside / remotely.


good luck!
best regards,


Niels.




- --
Niels Dettenbach
Syndicat IT&Internet
http://www.syndicat.com
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