[CentOS] SATA vs. SAS

[Ross S. W. Walker]

> -----Original Message-----
> From: centos-bounces at centos.org 
> [mailto:centos-bounces at centos.org] On Behalf Of Feizhou
> Sent: Wednesday, August 22, 2007 10:54 AM
> To: CentOS mailing list
> Subject: Re: [CentOS] SATA vs. SAS
> 
> 
> >>>> Option 1) 2 servers each having 2.0TB raid disk with SAS 
> >>>> drives, 2GB ram and standard other features. 
> >>> If going down this road, why not look into getting one of
> >>> those fancy new storage enclosures where the RAID is built
> >>> into the enclosure and can allow 2 servers to simultaneously
> >>> access the arrays with full battery backed write-back cache?
> >>>
> >> What is available for Linux in this department?
> > 
> > I'm testing out an MD3000 from Dell. It can allow 4 hosts with
> > single 4x serial paths, or 2 hosts with redundant 4x serial
> > and can chain up to 2 MD1000s off it for up to 45 spindles.
> > 
> > It was 2 RAID controllers in 2 EMMs with 512MB BBU write-back
> > that is synchronized between them which act as redundant RAID
> > controllers. Ships with 4 plain-jane 2 path SAS controllers
> > for host systems.
> > 
> > Downside, right now, it currently only supports SAS drives,
> > they hope to have a SAS/SATA firmware update maybe by year-end.
> 
> Binary drivers from Dell?

The HBA that connects to the MD3000 is just an mptsas driver which
is part of the stock kernel, but you can download the latest
version from Dell's website as a dkms source package.

-Ross

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