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From Tupshin Harper <tups...@tupshin.com>
Subject Re: idea drive layout - 4 drives + RAID question
Date Tue, 30 Oct 2012 01:07:14 GMT
I would generally recommend 1 drive for OS and commit log and 3 drive raid
0 for data. The raid does give you good performance benefit, and it can be
convenient to have the OS on a side drive for configuration ease and better
MTBF.

-Tupshin
On Oct 29, 2012 8:56 PM, "Ran User" <ranuser99@gmail.com> wrote:

> I was hoping to achieve approx. 2x IO (write and read) performance via
> RAID 0 (by accepting a higher MTBF).
>
> Do believe the performance gains of RAID0 are much lower and/or are not
> worth it vs the increased server failure rate?
>
> From my understanding, RAID 10 would achieve the read performance benefits
> of RAID 0, but not the write benefits.  I'm also considering RAID 10 to
> maximize server IO performance.
>
> Currently, we're working with 1 CF.
>
>
> Thank you
>
> On Mon, Oct 29, 2012 at 11:51 PM, Timmy Turner <timm.turn@gmail.com>wrote:
>
>> I'm not sure whether the raid 0 gets you anything other than headaches
>> should one of the drives fail. You can already distribute the
>> individual Cassandra column families on different drives by just
>> setting up symlinks to the individual folders.
>>
>> 2012/10/30 Ran User <ranuser99@gmail.com>:
>> > For a server with 4 drive slots only, I'm thinking:
>> >
>> > either:
>> >
>> > - OS (1 drive)
>> > - Commit Log (1 drive)
>> > - Data (2 drives, software raid 0)
>> >
>> > vs
>> >
>> > - OS  + Data (3 drives, software raid 0)
>> > - Commit Log (1 drive)
>> >
>> > or something else?
>> >
>> > also, if I can spare the wasted storage, would RAID 10 for cassandra
>> data
>> > improve read performance and have no effect on write performance?
>> >
>> > Thank you!
>>
>
>

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