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HP DL380 G7 (sas expander & cage)

Posted on 2012-04-12
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Last Modified: 2012-04-16
Have 8x HDD's at present, looking at the cage and sas expander.  Will this give me a 16x HDD single array or an additional/second array?

Any performance issues to worry about?

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Question by:CHI-LTD
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by:andyalder
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If you use the cage plus expander you can have all 16 disks in one array, if you use two RAID controllers you can have 2 * 8 disk arrays. More performance in total with two controllers since you can have twice as much cache, but the 16 disk array will be faster than an 8 disk array of course.

Make sure all cables to the backplanes are the same length and don't burn yourself on the heatsink on the expander, for a few dollars more you can but the 6" SAS cables to go from the motherboard to the expander - much tidier than the long cables you will have supplied.
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by:CHI-LTD
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So, to confirm, there is a SAS card.  On this card is there a singles SAS cable going from the card to the cage?
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by:andyalder
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A pair of SAS cables from motherboard to SAS expander, two pairs of SAS cables from expander to backplanes. The SAS expander plugs into the PCIe bus but only for power, it doesn't use PCIe data lines.

There are some links in http://www.experts-exchange.com/Hardware/Servers/Q_27669479.html worth looking at.
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by:CHI-LTD
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Cheers.  I assume cables come with the case or card?
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andyalder earned 500 total points
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Yes, if I remember correctly two pairs of cables come with the card and one pair with the cage, might be the other way around, there are enough anyway. You don't get short SAS cables though so you either have to use 28" cables from motherboard to card unless you buy a couple of 496012-B21 8" SAS cables. Our sales people don't buy the additional 8" cables, it's quite possible to cable up without but it's messy.
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