On Mon, Jan 19, 2009 at 11:02 AM, Adam Leventhal <a...@eng.sun.com> wrote:
> > "The recommended number of disks per group is between 3 and 9. If you > have > > more disks, use multiple groups." > > > > Odd that the Sun Unified Storage 7000 products do not allow you to > control > > this, it appears to put all the hdd's into one group. At least on the > 7110 > > we are evaluating there is no control to allow multiple groups/different > > raid types. > > Our experience has shown that that initial guess of 3-9 per parity device > was > surprisingly narrow. We see similar performance out to much wider stripes > which, of course, offer the user more usable capacity. > > We don't allow you to manually set the RAID stripe widths on the 7000 > series > boxes because frankly the stripe width is an implementation detail. If you > want the best performance, choose mirroring; capacity, double-parity RAID; > for something in the middle, we offer 3+1 single-parity RAID. Other than > that you're micro-optimizing for gains that would hardly be measurable > given > the architecture of the Hybrid Storage Pool. Recall that unlike other > products in the same space, we get our IOPS from flash rather than from > a bazillion spindles spinning at 15,000 RPM. > > Adam > BWAHAHAHAHA. That's a good one. "You don't need to setup your raid, that's micro-managing, we'll do that." Remember that one time when I talked about limiting snapshots to protect a user from themselves, and you joined into the fray of people calling me a troll? Can you feel the irony oozing out between your lips, or are you completely oblivious to it? --Tim
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