Well said. Thankyou and everyone
On Sun, Jun 8, 2008 at 10:14 AM, Damon L. Chesser <[EMAIL PROTECTED]> wrote: > On Sun, 2008-06-08 at 07:33 -0400, Mag Gam wrote: > > Again, I appreciate the responses. > > > > Damon: > > > > I am dealing with HW RAID. I looked for the "geometry" for my > > controller, but could not find it. > > > > > http://h20000.www2.hp.com/bizsupport/TechSupport/DocumentIndex.jsp?contentType=SupportManual&lang=en&cc=us&docIndexId=64179&taskId=101&prodTypeId=329290&prodSeriesId=1157686 > > > > I am very curious about the geometry too... > > > > I don't know enough to pick and choose the optimal setting. Since I > > am working in the academic field, I would like to really understand > > this "geometry setting". Can someone please elaborate on this topic? > > > > TIA > > Mag, > > It looks like your controller does not let you set very much manually: > page 13 shows you can set the Stripe Size. At this point, jump in and > play. But again, I don't think it will amount to a hill of beans. The > controller "masks" all reads and writes to the physical drives and the > OS is ignorant of the underlining details. IF you needed to set it up a > certain way, you would KNOW it. And even so, it looks like the only > things you can adjust with this controller is the stripe size. In > almost all cases the "optimal" setting is the default of the controller > when you use it's setup "wizard" thingy, what ever it may be called. > All other deviations are for very specific instructions in some manual > for some application (or you spend much time bench testing to arrive at > what works best for you with that given hardware). Some advice: unless > you are being graded in some way on the maximum through put of this > server: Jump in, install it and be done. > > We (IT) don't know the "optimum" settings of such things. We play with > it per some set of (specific) directions or we have a test box we can > bench test to meet some objective with. This concept is a moving, > slippery thing. It all depends on your network throughput, latency, cpu > load, bus load, I/O of every other component, I/O of the controller, > it's (the controller) memory, physical hd read/write speed and probably > a few more I can't think of right now. > > Kill this beast, install the os using defaults for the HDs, see if you > can serve up the files at a rate that works for you, if not, look it > over again. > > BTW, on the next model server you get, everything you learn here will > not be valid unless it is the exact same set of hardware. That is why I > would not fret over this, there is no "great maxim" to be learned except > "can I set up THIS box to work at the rate I need?" Sometimes the > answer is no, but that falls onto the procurement end of the deal. > > A DBA will spend much time telling a sys admin what strip to put onto a > RAID (using a hardware controller), but that is from the application mfg > having benched tested a specific model of server with very specific > hardware to arrive at the best throughput possible with a given hardware > load out. This is not your situation. The only answer is to test. > > Anyway, that is my 2C worth. > > > -- > Damon L. Chesser > [EMAIL PROTECTED] > http://www.linkedin.com/in/dchesser >
