On Wed, Oct 15, 2008 at 18:30, Scott Laird <[EMAIL PROTECTED]> wrote: > Oh, also I kind of doubt that a 750W power supply will spin 16 disks > up reliably. I have 10 in mine with a 600W supply, and it's > borderline--10 drives work, 11 doesn't, and adding a couple extra PCI > cards has pushed mine over the edge before. Power supply stress survival is more a function of dollars paid (or pounds weighed, if you like) than of any of the numbers on the box. I've done 14 drives on a 550W power supply (with no problems). Reputable places to search for power supply reviews are [1] and [2] (and others---but those are a good start).
> Most 3.5" drives want > about 30W at startup; that'd be around 780W with 16 drives. I'm not sure what kind of math you're using here. My Q6600 with 4 gigs of memory, a couple addon cards, 4 3.5 disks, 2 2.5 disks, and some fans and so forth draws a measly 140 watts with full CPU load and idle disks. A "normal" home file server system (i.e., doesn't have FBDIMMs) probably doesn't draw more than 150 not counting drives. 30W for a drive at spinup is a conservative (and therefore wise-to-plan-for) estimate---but in a pinch, real draw is usually more on the order of 20W. So the 750W power supply I have is probably okay for 30 disks, for ten minutes, if the alternative is certain death... but a more reasonable maximum load is probably 18 or so disks. Will [1]: http://www.hardocp.com/reviews.html?cat=NDUsUFNVIC8gUG93ZXIgU3VwcGxpZXMsaGVudGh1c2lhc3Q= [2]: http://jonnyguru.com/modules.php?name=NDReviews&op=Review_Cat&recatnum=13 _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
