+1: Reality.
Joe Landman wrote:
Rahul Nabar wrote:
On Sun, Jan 17, 2010 at 9:36 PM, Joe Landman
wrote:
Ohhh ... it depends. Some of the "vendors" hardware raid ... heck
... most
of it ... is rebadged LSI gear. Usually their lower end stuff which is
sometimes fake-raid. Use fake-raid only
On Sun, Jan 17, 2010 at 8:03 PM, Gustavo Correa wrote:
> I've got Rmax/Rpeak around 84% on the cluster (AMD Opteron Shanghai, IB on a
> single switch).
> I didn't have the cluster available to play with HPL for too long, not too
> much tuning,
> I had to move to production mode.
> Some folks on
Hardware RAID, in my experience, works well with most LSI controllers
(that haven't been modified to become Dell PERC controllers) and 3Ware
controllers. I've had pretty grim results with most others. A
colleague and I had great initial results with several ARECA
controllers, but then they lo
On Sun, Jan 17, 2010 at 9:58 PM, Joe Landman
wrote:
> Its a software RAID implementation pretending to be a hardware RAID
> implementation. They are rarely if ever as good as MD. Many of them in
> Linux will invoke dm (the "other" RAID engine) as dm has "support" for
> fake-raid. Note that we
Rahul Nabar wrote:
On Sun, Jan 17, 2010 at 9:36 PM, Joe Landman
wrote:
Ohhh ... it depends. Some of the "vendors" hardware raid ... heck ... most
of it ... is rebadged LSI gear. Usually their lower end stuff which is
sometimes fake-raid. Use fake-raid only if no other options exist.
Thanks
Thanks Tony for the helpful tips!
On Sun, Jan 17, 2010 at 5:08 PM, Tony Travis wrote:
>
> However, I would avoid relying on LVM mirroring for data protection. It is
> much safer to stripe a set of RAID1's using LVM. I don't think LVM is useful
> unless you are managing a disk farm. The commonest
On Sun, Jan 17, 2010 at 9:36 PM, Joe Landman
wrote:
>
> Ohhh ... it depends. Some of the "vendors" hardware raid ... heck ... most
> of it ... is rebadged LSI gear. Usually their lower end stuff which is
> sometimes fake-raid. Use fake-raid only if no other options exist.
Thanks Joe! What's "f
Rahul Nabar wrote:
If I have a option between doing Hardware RAID versus having software
raid via mdadm is there a clear winner in terms of performance? Or is
Depends upon workload, writes vs reads, streaming vs random IO, number
of simultaneous readers/writers. There is no real clear answer.
I had a nightmare problem with a newly compiled kernel not booting.
The problem may have been with the command mkblkdevs of nash but in
any case I did extensive web search on the AHCI controller that I had
in both a notebook and a desktop computer, both of which had the
booting problem.
One examp
Hi Rahul
I've got Rmax/Rpeak around 84% on the cluster (AMD Opteron Shanghai, IB on a
single switch).
I didn't have the cluster available to play with HPL for too long, not too much
tuning,
I had to move to production mode.
Some folks on mailing lists said they'd get 90%, but the topmost group i
Rahul Nabar wrote:
If I have a option between doing Hardware RAID versus having software
raid via mdadm is there a clear winner in terms of performance? Or is
the answer only resolvable by actual testing? I have a fairly fast
machine (Nehalem 2.26 GHz 8 cores) and 48 gigs of RAM.
Hello, Rahul.
On 2010-01-17, at 6:24AM, Rob Horton wrote:
> On Sat, Jan 16, 2010 at 11:50:48AM +0300, Walid wrote:
>>
>> do you know of any official courses run in Europe, or Asia covering
>> HPC system, or development. mpi or new distributed memory paradigms
>> are welcome.
>
> NAG run various courses on beha
Rahul Nabar wrote:
> If I have a option between doing Hardware RAID versus having software
> raid via mdadm is there a clear winner in terms of performance?
No.
> Or is
> the answer only resolvable by actual testing? I have a fairly fast
> machine (Nehalem 2.26 GHz 8 cores) and 48 gigs of RAM.
>
If I have a option between doing Hardware RAID versus having software
raid via mdadm is there a clear winner in terms of performance? Or is
the answer only resolvable by actual testing? I have a fairly fast
machine (Nehalem 2.26 GHz 8 cores) and 48 gigs of RAM.
Should I be using the vendor's hardw
On Sat, Jan 16, 2010 at 11:50:48AM +0300, Walid wrote:
> Dear All,
>
> do you know of any official courses run in Europe, or Asia covering
> HPC system, or development. mpi or new distributed memory paradigms
> are welcome.
NAG run various courses on behalf of HECToR in the UK:
http://www.hector
If anyone is looking for a job in the UK, there are a few on offer:
http://www.jobserve.com/Systems-Specialist-Abingdon-Abingdon-Oxfordshire-Permanent-W6BA2DC924C566BD1.jsjob
(I think you can work out who this is if not I can tell you off list!)
http://www.jobserve.com/High-Performance-Comput
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