Best layout for SSD & SAS OSDs

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Hi cephers,

   I've the following scheme:

7x OSD servers with:
    4x 800GB SSD Intel DC S3510 (OSD-SSD)
    3x 120GB SSD Intel DC S3500 (Journals)
    5x 3TB SAS disks (OSD-SAS)

The OSD servers are located on two separate Racks with two power circuits each.

   I would like to know what is the best way to implement this.. use the 4x 800GB SSD like a SSD-pool, or used them us a Cache pool? or any other suggestion? Also any advice for the crush design?

Thanks in advance,   

German
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