[CentOS] SCSI Raid

Feizhou
Fri, 16 Jun 2006 11:34:02 -0000

Bowie Bailey wrote:
> I hate to bring up the raid card wars again, but...  :)
>
> It's pretty well established that 3ware is a good "real"
hardware raid
> card for SATA drives.
>
> So what is a good card for SCSI raid?  My searches have come up with
> Adaptec and LSI as the main players here.  Are the LSI MegaRAID cards
> "real" hardware raid?  Which cards can give good raid 5
performance?

Cards that don't use i960 cpus ( really ancient now =D ) and that have
plenty of buffer ram (read, onboard RAM or DIMM modules or NVRAM) and of
course, battery pack backup for the onboard memory.

So 3ware 85xx are out for raid 5 performance but 3ware 9xxx will perform
given sufficient RAM as an example. I suspect the same for any SCSI RAID
card with regard to RAID 5 performance.

Bryan J. Smith had a good explanation why quite some time ago on this list.