谁能准确的区分一下fakeRAID和HostRAID

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relaxssl
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谁能准确的区分一下fakeRAID和HostRAID

#1

帖子 relaxssl » 2008-12-21 23:51

我觉得概念好模糊,谁能说一说
ryoohki
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Re: 谁能准确的区分一下fakeRAID和HostRAID

#2

帖子 ryoohki » 2008-12-22 11:00

这种东西本身只有在设备层才有区分的,软件应用层根本分辨不出的
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Re: 谁能准确的区分一下fakeRAID和HostRAID

#3

帖子 relaxssl » 2008-12-22 15:32

ryoohki 写了:这种东西本身只有在设备层才有区分的,软件应用层根本分辨不出的
那么我怎么知道我的Adaptec scsi 39320-R组的是fakeraid还是Hostraid,还是software raid,要按照哪个指导安装才能顺利完成?
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Re: 谁能准确的区分一下fakeRAID和HostRAID

#4

帖子 ryoohki » 2008-12-22 18:13

纯软raid 指的是不用任何raid卡或raid控制器只通过操作系统进行标示的raid,通常在windows下比较常见(可以google下镜像卷,带区卷来具体学习)。其它的raid都是通过主板磁盘控制器,主板板载raid控制器或raid卡;在bios设置界面(主板芯片组提供raid功能)或开机按热键进入raid类型设置界面(pci,pci-32,pci-e,主板板载raid控制芯片 提供raid功能)进行raid类型设置的,以上步骤设置完毕后在windows下会被认作一块硬盘;注意如果组成的是非 raid0 模式的raid我们还要安装raid辅助软件来识别出raid内的每块硬盘,否则在硬盘损坏需要更换的情况下我们无法进行硬盘的更换甚至于我们无法得知硬盘损坏的消息(主板自带的硬盘检测接口无法读取raid模式下的硬盘状态数据);在linux下我们要通过安装dmraid来识别由主板磁盘控制器,主板板载raid控制器或raid卡组成的raid设备否则linux只是把硬盘简单的识别成多个硬盘。
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Re: 谁能准确的区分一下fakeRAID和HostRAID

#5

帖子 relaxssl » 2008-12-23 11:57

We recently purchased a Adaptec SATA II RAID card model number 1420SA. Everywhere that this was marketed, it was listed as a “Hardware Raid” card, which we took to mean that it actually did RAID in hardware. Turns out that the cards has what Adaptec laughingly calls “HostRAID”. We didn’t know at the time how HostRAID got its name, but turns out it is really descriptive. They call it HostRAID, because the damn host machine does the RAID, not the card. They are selling SATA controllers that simulate hardware RAID, by moving the software RAID into the driver and out of the OS’s control. How is it ok for them to market this as a hardware RAID solution?
http://www.brentnorris.net/blog/archives/158
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