Oh Ricardo,
Before i forget to mention. If power is a problem with SATA disks,
consider that in general Maxtor diskdrives eat a LOT more power than
those of several other manufacturers.
At least that's when i read the power consumption that's written on the disk
itself and compare it to others.
Note this didn't stop me from buying 4 maxtor S-ATA drives, as i expect
those drives to fail soon,
and when one fails i want to bicycle only 1 street to a computershop here
which only sells Maxtors (of course,
as it brings him the most profit those disks). Returning disks to a
computershop that's 100 KM away is
always such problems.
YMMV
Yet i'm very interested in knowing reactions from others here what they find
from those huge power differences
in harddrives.
Vincent
----- Original Message -----
From: "Joe Landman" <[EMAIL PROTECTED]>
To: "Ricardo Reis" <[EMAIL PROTECTED]>; <[email protected]>
Sent: Wednesday, March 01, 2006 6:21 PM
Subject: Re: [Beowulf] 'dual' Quad solution from Tyan
On Tue, 28 Feb 2006 22:38:31 +0000 (WET), Ricardo Reis wrote
Thank you all for your reply's.
1. The system will be used for CFD intensive calculation, using
comercial and in the house codes, MPI flavor;
You want smaller systems then.
2. The cluster I've thought to build initially would be: * 8
nodes (including master), with dual motherboards (2 Opteron CPUs,
single core) * 16 Opteron 2.4GHz; * 4 GB per node (32 GB total)
; * 1 80 Gb disc (SATA II) per node for system and scratch space;
* 2 80 Gb disc (SATA II) for system on master, on RAID 1; * 3 500
Gb disc (SATA II) for storage, home; * 2 Gigabit switch, one for
MPI, another for system and NFS; * Motherboard is the Tyan
S2882G3NR-D;
Not the best choice of MB. Uses broadcom NICs, and we have seen higher
than
we like failure rates with Tyan MBs at our customers sites.
3. I thought that the lantency in this VX50 would be far less
than in the Gigabit network;
Possibly, but at a much higher cost. If latency is your issue go with
Infinipath or Infiniband (for the moment). I have been hearing
interesting
things about 10Gbe, but haven't had a chance to look into it yet in great
depth.
4. The solution for cluster vs. VX50 is around less 3500 euro for
the VX50;
Interesting. You could get a bunch of single CPU boards, load them with
dual
core units, and come in at a lower price point.
5. I thought also that the requirements in HVAC would be less for
the VX50;
Fewer PS, more fans, more noise, single point of failure (the last one is
bad).
6. I'm aware and thinking that this technology is new and can be
a single-point of failure, regarding the cluster option;
Yes.
7. Why 2 single core are better than a dual core? because of
sharing resources?
Actually for CFD, it depends upon the code and the memory access patterns.
If
you fill up the memory channel with one core, the second core will have to
wait to access the memory.
thanks for your knowledge sharing,
Ricardo Reis
"Non Serviam"
n.p.: http://radio.ist.utl.pt
n.r.: http://atumtenorio.blogspot.com
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