On 6/15/07, Brian Hechinger <[EMAIL PROTECTED]> wrote:
On Fri, Jun 15, 2007 at 02:27:18PM -0700, Neal Pollack wrote: > > So it only has room for one power supply. How many disk drives will you > be installing? > It's not the steady state current that matters, as much as it is the > ability to handle the surge current > of starting to spin 17 disks from zero rpm. That initial surge can > stall a lot of lesser power supplies. > Will be interesting to see what happens here.
Drives only really take 1.5A or so from the 12V rail when spinning up, but it's a good rule of thumb to pretend they take 3A each on top of the other junk in your system. A low-usage system like a Core 2 Duo with a non-nV chipset and onboard or low-end video can run in 100 watts with no problems, so add 51A of 12V rail capacity to 100 watts worth and you can still find PSUs that supply that. If you do staggered spinup, you can allocate something more like 10A plus one amp per drive. In either case, an OP1000 (http://www.newegg.com/Product/Product.aspx?Item=N82E16817256010) or a PCP&C TC1KW-SR (http://www.newegg.com/Product/Product.aspx?Item=N82E16817703007) would do you even if you wanted to do SLI or something equally ridiculous.
Hmmm, that's an interesting point. I remember the old days of having to stagger startup for large drives (physically large, not capacity large). Can that be done with SATA?
Can and is. On my Marvell 88sx6081 controller, it happened without my having to configure anything magical. Will _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
