Hardware RAID Level & Performance

[Norman Zhang]

Henrique de Moraes Holschuh wrote:
>>Thanks for your explanation. How's this one
>>http://www.supermicro.com/products/accessories/addon/DAC-ZCRINT.cfm
>>
>>It uses Intel 80303 I/O processor boards? I'm planning to build my 
>>Cyrus-IMAPD on this HW.
> 
> Well, I have something like it, an Intel SRCZCR.  It is also a zero-channel
> RAID adapter, and yes, it is a real honest hardware RAID, but it is not
> PCI-X.
> 
> But it is a *piece* *of* *crap* performance-wise, and that's using U320 SCSI
> drives on the host adapter.  So, it will work well if you don't need much
> performance.  But otherwise, get something better.  Anything that hasn't got
> NVRAM (64MB or more) and an on-card SCSI U160 or U320 controller is not
> worth thinking about IMHO (for SATA that translates to on-card NCQ SATA
> controllers, I suppose).

Do you have some figures?

> You will notice Intel itself stopped with this sillyness and their newer
> zero-channel adapters feature 128MB of DDR333 RAM and a IOP-321 processor...

Thanks. I'll look into that. I'm not sure if support is already added to 
the 2.6.x kernel. Most of us run Cyrus on Linux/BSD, right?

Regards,
Norman Zhang
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