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From Igor <>
Subject Re: Advice on architecture
Date Wed, 28 Mar 2012 13:15:07 GMT
On 03/28/2012 02:04 PM, Radim Kolar wrote:
>> RAID0 would help me use more efficiently the total disk space 
>> available at each node, but tests have shown that under write load it 
>> behaves much worse than using separate data dirs, one per disk.
> there are different strategies how RAID0 splits reads, also changing 
> io scheduler and filesystem helps. I found that ZFS/ZRAID is best, 
> especially backups are very good. If you dont plan to do backups ext4 
> is not bad either, but compactions are rather slow on it.

I'm also trying to evaluate different strategies for RAID0 as drive for 
cassandra data storage. If I need 2T space to keep node tables, which 
drive configuration is better: 1T x 2drives or 500G x 4drives? Which 
stripe size is optimal? Should I use hardware raid or linux raid is ok? 
I mostly concerned with read performance.

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