James G. Sack (jim) wrote: > Joshua Penix wrote: >> On Feb 12, 2007, at 12:45 PM, Neil Schneider wrote: >> >>> 4Gb RAM >>> 73Gb + Disk space >>> 1U case >>> >>> How do you think it should be spec'd? >> That's about right, though I don't think we'd need more disk space nor >> would we need all 4GB of RAM (but if it's cheap, it can't hurt to get >> it). I'm sorry I'm lagging on a component list/price quote, but I >> should be able to get one to this list today or tomorrow. >> >> One more specific question to discuss is one of SCSI/SAS (which I assume >> you're suggesting due to the 73GB size quote) vs. SATA. For the load >> that Sparky would handle, I believe we would be very well served by a >> server-class SATA-2 drive (Seagate's NL line for example) at 7200 RPM >> with NCQ. This would keep server cost down drastically, and would also >> inherently solve the space problem due to SATA's typical 300-500GB >> capacity. Of course we should consider nothing but a pair in RAID1 >> configuration. >> > > Comparison weighting factors: > (my opinion, of course) > > 10 mtbf > 8 cost (including corequisites, eg scsi mobo/adapters differential) > 6 power > 5 performance > > I put power in there, because we are running on donated power. > > I guess my priorities are biased toward SATA. >
I left out capacity. It has to be at least N (whatever that might be). All other things being equal (eg, cost), excess capacity above the minimum might deserve a weighting factor of maybe 4? Surely there are also other considerations. I can think of the following mtbf, redundancy and replacement availability & cost for: power supply fans memory, cpu, mobo reputation, .. (I assume Josh/others will factor in their best judgement om these). Regards, ..jim -- [email protected] http://www.kernel-panic.org/cgi-bin/mailman/listinfo/kplug-steer
