On Mon, Sep 17, 2012 at 1:19 AM, aaron morton <aa...@thelastpickle.com>wrote:
> 4 drives for data and 1 drive for commitlog, > > How are you configuring the drives ? It's normally best to present one big > data volume, e.g. using raid 0, and put the commit log on say the system > mirror. > > Given the advice to use a single RAID 0 volume, I think that's what I'll do. By system mirror, you are referring to the volume on which the OS is installed? Should the volume with the commit log also have multiple disks in a RAID 0 volume? Alternatively, would a RAID 1 setup be reasonable for the system volume/OS, so the system itself can be resilient to disk failure, or would that kill commit performance? Any preference to hardware RAID 0 vs. using something like mdadm? A word of warning. If you put more than 300GB to 400GB per node you may end > experience some issues such as repair, compaction or disaster recovery > taking a long time. These are simply soft limits that provide a good rule > of thumb for HDD based systems with 1 GigE networking. > Hmm. My hope was to be able to run a minimal number of nodes and maximize their capacity because it doesn't make sense in my case to build or maintain a large cluster. I wanted to run a two-node setup (RF=1, RCL=ONE, WCL=ALL), each with several disks having large capacity, totaling 10 - 12 TB. Is this (another) bad idea? Casey
