Neil Cameron
这是我经常听到的一句话。Adaptecby PMC推出了两个系列的控制卡，不论其功能还是本质均十分相近…比如说，6Gb/sec7805 和12Gb/sec 8805相比，两块卡都是具备完整功能的8端口RAID卡——但一款是6Gb (7系列），而另一款是12Gb/秒（8系列）。
而今市面上的硬盘多数是6Gb/秒，所以买家都在买6Gb/秒的控制卡来满足其需求。当我指出，8805比7805略略便宜些（除了Amazon上一个不靠谱的卖家的卖价比我们的市场价要低$10）的时候，才会引起人们的注意…但回过头来，他们还是会说，“但我根本不需要12Gb的控制器！”
好吧…用PMC的8805（12Gb/秒）的控制器，如果连上12Gb SAS SSD，它就是一块12Gb的控制卡，但是，如果只连接6Gb/秒的硬盘呢？那它成了什么控制卡？是的，答案就是你所想…盘片的速度决定了连接的速度，故而此时，8805就等同于一块6Gb的控制器。
功能相同，IOPs的性能远远优于7系列控制器——价格还稍许便宜些，但大家猜猜，我听到的是什么？…
“但我根本不需要12Gb的控制器！”
有时候，人们的想法就卡在印刷在包装盒上的数据上，对其他均视而不见了，也不再考虑“到底什么产品对系统（或客户）有利”。当我试图理解他们的思路时，不免感到恼火——大家只关心自己能理解的数字，然后就置其余于不顾了。
那么，这个问题到底是不是选择速度超出自己切实需要的控制卡？真的是速度的问题吗？答案是：只有当你不得不耗费大量的资源来实现这一目标时才是如此。而8805并不是这样。
所以啊，在搜寻8端口控制器时，特别时可能会用到SSD的情形下，不要再让“一叶障目”，仔细研究一下8805…你将因此而获得竞争上的优势。
But I don’t want a 12Gb controller! …
I hear this all the time. Adaptec makes two series of cards that are very similar in function and nature … take,for instance, the 6Gb/sec 7805 and the 12Gb/sec 8805. Both are 8 portfully-featured RAID cards – but one is 6Gb (Series 7) vs the other at 12Gb/sec(Series 8).
Now most drives on the market today are 6Gb/sec, so buyers go looking for 6Gb/sec cards to fulfill their needs. When I point out that the 8805 is slightly cheaper than the 7805 (apart from the one dodgy seller on Amazon who is promoting this card $10 cheaper than we sell it to the market for – complete with the wrong picture) then it starts to get people’s attention … but they still come back to me and say “but I don’t want a 12Gb controller!”
So … with our 8805 (12Gb/sec) controller, if you plug 12Gb SAS SSD into it then it’s a 12Gb controller … butif you only plug 6Gb/sec drives into it then it’s a ??? controller? You guessed it … the speed of the drives dictate the connection speed so in effect the 8805 works as a 6Gb controller.
Function is the same, and IOP performance is far greater than the 7 series controller – for slightly less price, but guess what I still hear???…
“I don’t want a 12Gb controller!”
It gives me the irits sometimes to try and understand the mentality of people who are blinded by the numbers on thebox, and don’t think about “what is right for the system (or their customer)” …they just go off the numbers because that’s what they know.
So is it a problem to have a faster card than you really need? Is it ever a problem to have something fast? Only if it costs an arm and a leg … and the 8805 doesn’t.
So when looking at 8 port controllers,especially when SSD are involved, take the blinkers off and look at the 8805 …you might just come out in front.
原文地址：http://blog.csdn.net/pmc/article/details/44338603
