nick at byu.edu
Tue Mar 15 12:26:29 MST 2005
On Tuesday 15 March 2005 12:03 pm, jeff wrote:
> At work we are going to set up a new fileserver Linux w/ Samba. Get rid
> of the last @#^$%@ windows server finally :)
> We are looking at using a areca SATA RAID controller with lots of
> drives. I have never used SATA RAID, only SCSI. What kind of
> processor(s) and RAM am I going to need for this?
What kind of load?
How big is the average working set?
How big are the files? Generally very large? All small?
I would speculate that if it's (true) hardware raid, then the only real load
on the cpu is the fs layer and the network stack--thus as long as it is fast
enough to keep the I/O queues busy and the packets flowing, it's enough.
As for ram--quantity of ram and your I/O performance determine your
latency--ie cache hit or miss. You'll need to know your load patterns for
If it is not hardware raid, that's a whole different game--you'll need to
consider how many cycles are consumed in the md layer, and consider SMP to
reduce the additional latency incurred by them.
What hardware was the windows-box being which is being replaced using? Was it
sufficient for the load? That's probably your most useful metric.
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