My application is to use to access SSD and I choose Marvell 88SE9230 as SATA Host Controller. The can access 88SE9230 through 2 lanes PCIE at 5.0Gbps. Here is my question: 1.My write and read speed requirement is above 450MBps,is it possible with one SSD?(The SSD can meet that requirement and I use Linux) 2.If the requirement can not be met due to the filesystem,how about use Raid?(like Raid 0,using 2 SSD) 3.As 88SE9230 can support hardware Raid,should I write my own Raid driver or just access the Raid through ahci platform? In reply to: Thanks Bill, Are there any sample designs about my application?
I have checked the and found that the PCIE can meet my requirement. But I still have the question about the Raid. I have checked the TI SATA Wiki. It is said that if you use a hardware Raid,you can change the Raid Controller to Raid mode on PC, and then use the ahci to access it directly.
I get a little confused about that. The orignial text is ' Do we support external hardware RAID External hardware RAID is a blackbox for us. Usually external RAID storage tower vendors provide RAID configuration tool. These are either x86 Windows or x86 Linux host based software tool. Either we have to port these tools to ARM Linux (DM81XX) or we have to use a pre-configured external RAID storage. During our testing we configured RAID devices from Windows XP host for RAID-0 & JBOD and used it with our platform.'
In reply to: Hi, Xiao Peng, TI developer tested in the past a RevoDrive SSD with the same throughput on a PC and on C6678 EVM (~180MB/s) but we think it was limited to a 200MB/s of theoretical performances. About raid support, if the SSD has a dedicated Linux driver which leverage the hw raid 0, you can use it. Otherwise, you will need to use the Linux generic SATA support through the AHCI driver without any hw raid support or develop your own driver. It seems that the 88SE9230 has no specific Linux driver in either 2.6.34 or in recent kernel (thus no hw raid 0 capability in Linux). Moreover generally Marvell does not provide the information on how programming their devices, so you cannot easily create your own one driver. Left 4 dead 2 black box repack itunes charts. All content and materials on this site are provided 'as is'.
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