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From Віталій Тимчишин <>
Subject Re: Disk configuration in new cluster node
Date Wed, 19 Sep 2012 03:42:41 GMT
Network also matters. It would take a lot of time sending 6TB over 1Gb
link, even fully saturating it. IMHO You can try with 10Gb, but you will
need to raise your streaming/compaction limits a lot.
Also you will need to ensure that your compaction can keep up. It is often
done in one thread and I am not sure if it will be enough for you. As of
parallel compaction, I don't know exact limitations and if it will be
working in your case.

2012/9/18 Casey Deccio <>

> On Tue, Sep 18, 2012 at 1:54 AM, aaron morton <>wrote:
>> each with several disks having large capacity, totaling 10 - 12 TB.  Is
>> this (another) bad idea?
>> Yes. Very bad.
>> If you had 6TB on average system with spinning disks you would measure
>> duration of repairs and compactions in days.
>> If you want to store 12 TB of data you will need more machines.
> Would it help if I partitioned the computing resources of my physical
> machines into VMs?  For example, I put four VMs on each of three virtual
> machines, each with a dedicated 2TB drive.  I can now have four tokens in
> the ring and a RF of 3.  And of course, I can arrange them into a way that
> makes the most sense.  Is this getting any better, or am I missing the
> point?
> Casey

Best regards,
 Vitalii Tymchyshyn

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