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From Ted Zlatanov <...@lifelogs.com>
Subject Re: Effective allocation of multiple disks
Date Fri, 12 Mar 2010 18:09:18 GMT
On Thu, 11 Mar 2010 12:01:27 -0600 Eric Evans <eevans@rackspace.com> wrote: 

EE> On Wed, 2010-03-10 at 23:20 -0600, Jonathan Ellis wrote:
>> On Wed, Mar 10, 2010 at 9:31 PM, Anthony Molinaro
>> <anthonym@alumni.caltech.edu> wrote:
>> > I would almost recommend just keeping things simple and removing
>> > multiple data directories from the config altogether and just
>> > documenting that you should plan on using OS level mechanisms for
>> > growing diskspace and io.
>> 
>> I think that is a pretty sane suggestion actually. 

EE> Or maybe leave the code as is and just document the situation more
EE> clearly? If you're adding more disks to increase storage capacity
EE> and you don't strictly need the extra IO, then multiple data
EE> directories might be preferable to other forms of aggregation (it's
EE> certainly simpler than say a volume manager).

Could Cassandra use a block device as raw storage?  You avoid the
filesystem overhead and it lets the sysadmin determine the best kind of
device (RAID or not underneath) to allocate.

Ted


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