troubleshooting Question

Drive configuration in HP DL380 Gen 9

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sfabsFlag for United Kingdom of Great Britain and Northern Ireland asked on
Server HardwareStorage HardwareVirtualization
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I was hoping for some advice on drives and configuration for a server I want to spec up.

The server is an HP DL380 Gen 9. part number: 826684-B21

The RAID card in the controller is a HP Smart Array P440ar/2GB FBWC 12Gb 1-port Int SAS Controller

I want to put a second internal drive cage for additional storage. But the RAID controller only supports 8 connections (the bay already in there)

I have been told a SAS expander card will do this for me (part number: 727250-B21): I understand this will allow me to fulfil 16 connections... is this correct?

I would like to run 5 times 1.2 TB 10K SAS drives in a RAID 1+0 (with one spare) in drive cage 1. This will be for the operating systems of 4-5 virtual servers (DC, File, Exchange and SQL (SQL DB and logs will be on a different array). I have been led to believe that 10K drives will suffice for this job and to ensure I have a lot of memory. is this true? I think single or dual port drives makes no difference in this config? Also, what about 6G or 12G... I have seen 2 part numbers 781518-B21 and 718162-B21 and the price is pretty much identical. Do I need 12G because the raid controller is 12G?

On the second drive cage I wanted to run 2 arrays. 2 * 480GB SATA SSD's in RAID 1 (twice over) and a hot spare (5 drives in total). 1 array for SQL log files and 1 for SQL Database. Having separate RAID arrays was recommended for the SQL application.

Obviously SATA SSD are about half the price of SAS SSD's! I have read differing opinions. Is this a false economy? I thought running the SATA drives (they will be HP enterprise SATA drives) in a mirror would be ok... I understand they can have problems in RAID 5-6 configurations?

Thanks for any help
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