Re: [CentOS] SAS/SATA DAS

2008-09-02 Thread nate
Rudi Ahlers wrote: > Sorry for hi-jacking this thread, but it's very interesting. What's the > difference, apart from the speed & price between SAS & SATAII? On the most basic level I think of SAS as basically the new SCSI, and SATA II as the new PATA. SCSI = smaller, faster SATA II = bigger, sl

RE: [CentOS] SAS/SATA DAS

2008-09-02 Thread Joseph L. Casale
>There was a thread about the MTBF of various types of drives, linking >to articles about the experiences of Google.com, here in this mailing >list, probably 1 or 2 years ago. As I recall, they found the MTBF >between different types of drives to be about the same? That's exactly what I was refer

Re: [CentOS] SAS/SATA DAS

2008-09-02 Thread Lanny Marcus
On Tue, Sep 2, 2008 at 5:01 PM, Joseph L. Casale <[EMAIL PROTECTED]> wrote: >>Sorry for hi-jacking this thread, but it's very interesting. What's the >>difference, apart from the speed & price between SAS & SATAII? > > SAS is more enterprise geared, relating to speed and MTBU (probably a load of

Re: [CentOS] SAS/SATA DAS

2008-09-02 Thread John R Pierce
> > >Sorry for hi-jacking this thread, but it's very interesting. What's the > >difference, apart from the speed & price between SAS & SATAII? > > SAS is more enterprise geared, relating to speed and MTBU (probably a load of > crap on that point) > and SATA is cheaper and does not perform as we

RE: [CentOS] SAS/SATA DAS

2008-09-02 Thread Joseph L. Casale
>Sorry for hi-jacking this thread, but it's very interesting. What's the >difference, apart from the speed & price between SAS & SATAII? SAS is more enterprise geared, relating to speed and MTBU (probably a load of crap on that point) and SATA is cheaper and does not perform as well, supposedly

Re: [CentOS] SAS/SATA DAS

2008-09-02 Thread Rudi Ahlers
On Tue, Sep 2, 2008 at 8:44 PM, nate <[EMAIL PROTECTED]> wrote: > Joseph L. Casale wrote: > > > Anyone got any real world info they can share? I need 3.5" SATA II at > least > > 12 drives behind SAS, > > I am not concerned about space and could use multiple 1u chassis if I had > > to. > > What abo

Re: [CentOS] SAS/SATA DAS

2008-09-02 Thread nate
Joseph L. Casale wrote: > Anyone got any real world info they can share? I need 3.5" SATA II at least > 12 drives behind SAS, > I am not concerned about space and could use multiple 1u chassis if I had > to. What about this? http://h18000.www1.hp.com/products/quickspecs/13045_na/13045_na.html T

RE: [CentOS] SAS/SATA DAS

2008-09-02 Thread Joseph L. Casale
>I assume you're talking about the MSA60? Yup >We have several of those installed >and haven't seen any bottle necks there. Even the fastest SATA drives fall >short of the 150MB/sec max SATA I throughput. And if you could push the >1.5Gb/sec on the SATA side, then the SAS side with a 4x port (4x3

Re: [CentOS] SAS/SATA DAS

2008-09-02 Thread Peter Arremann
Hi, I assume you're talking about the MSA60? We have several of those installed and haven't seen any bottle necks there. Even the fastest SATA drives fall short of the 150MB/sec max SATA I throughput. And if you could push the 1.5Gb/sec on the SATA side, then the SAS side with a 4x port (4x3Gb/

Re: [CentOS] SAS/SATA DAS

2008-09-02 Thread Rainer Duffner
Joseph L. Casale schrieb: I need to replace a slow HP MSA20 that’s a bottleneck right now (We are an HP shop). HP’s only option with 3.5” SATA drives is stuck at SATA I behind a SAS controller. Dell makes an MD1000 that claims SATA II speeds behind a SAS Perc 5/E (Don’t know anything about