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From Yiming Sun <yiming....@gmail.com>
Subject Re: RE 200TB in Cassandra ?
Date Thu, 19 Apr 2012 12:16:16 GMT
600 TB is really a lot, even 200 TB is a lot.  In our organization, storage
at such scale is handled by our storage team and they purchase specialized
(and very expensive) equipment from storage hardware vendors because at
this scale, performance and reliability is absolutely critical.

but it sounds like your team may not be able to afford such equipment.
 600GB per node will require a cloud and you need a data center to house
them... but 2TB disks are common place nowadays and you can jam multiple
2TB disks into each node to reduce the number of machines needed.  It all
depends on what budget you have.

-- Y.


On Thu, Apr 19, 2012 at 7:54 AM, Franc Carter <franc.carter@sirca.org.au>wrote:

> On Thu, Apr 19, 2012 at 9:38 PM, Romain HARDOUIN <
> romain.hardouin@urssaf.fr> wrote:
>
>>
>> Cassandra supports data compression and depending on your data, you can
>> gain a reduction in data size up to 4x.
>>
>
> The data is gzip'd already ;-)
>
>
>> 600 TB is a lot, hence requires lots of servers...
>>
>>
>> Franc Carter <franc.carter@sirca.org.au> a écrit sur 19/04/2012 13:12:19
>> :
>>
>> > Hi,
>> >
>> > One of the projects I am working on is going to need to store about
>> > 200TB of data - generally in manageable binary chunks. However,
>> > after doing some rough calculations based on rules of thumb I have
>> > seen for how much storage should be on each node I'm worried.
>> >
>> >   200TB with RF=3 is 600TB = 600,000GB
>> >   Which is 1000 nodes at 600GB per node
>> >
>> > I'm hoping I've missed something as 1000 nodes is not viable for us.
>> >
>> > cheers
>> >
>> > --
>> > Franc Carter | Systems architect | Sirca Ltd
>> > franc.carter@sirca.org.au | www.sirca.org.au
>> > Tel: +61 2 9236 9118
>> > Level 9, 80 Clarence St, Sydney NSW 2000
>> > PO Box H58, Australia Square, Sydney NSW 1215
>
>
>
>
> --
>
> *Franc Carter* | Systems architect | Sirca Ltd
>  <marc.zianideferranti@sirca.org.au>
>
> franc.carter@sirca.org.au | www.sirca.org.au
>
> Tel: +61 2 9236 9118
>
> Level 9, 80 Clarence St, Sydney NSW 2000
>
> PO Box H58, Australia Square, Sydney NSW 1215
>
>

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