On Dec 23, 2010, at 7:42 PM, Luke S Crawford wrote: >> Price, performance, capacity... pick two. > > Only if you choose wisely. It's pretty easy to get only one.
That is an excellent corollary! Thanks! > Like you, I run out of iops /far/ before I run out of disk > bandwidth (and /far/ before a sata expander fan out system > like backblaze would run out of disk bandwidth, for that matter) > so while I agree that 2tb disks are kinda useless for the > virtualization backend use case, Iops are usually limited by > spindles, and the backblaze is a nice, cheap way to get a lot > of spindles in a chassis. If you're shooting for IOPs, then I'd be inclined to go with a small number of good price/performance Enterprise SSD devices. IMO, they'd be able to give you way, way more IOPs for the amount of money you'd spend building the boxes, racking the boxes, networking the boxes, powering the boxes, monitoring and managing the boxes, cooling the boxes, and repairing & replacing failed components in the boxes. If you need both IOPs and capacity, then the obvious solution is something like ZFS, where you have a small number of good price/performance Enterprise SSD devices to handle your ZFS commitlog, backed up by the scads of rotating media. > I'm just saying; if you are limited by iops on spinning disk, you are > limited by spindles, and the backblaze box is one of the cheapest ways > I've seen to get a bunch of those. $10k buys a lot of good price/performance SSD devices which can give you incredible amounts of IOPs. -- Brad Knowles <[email protected]> LinkedIn Profile: <http://tinyurl.com/y8kpxu> _______________________________________________ Tech mailing list [email protected] https://lists.lopsa.org/cgi-bin/mailman/listinfo/tech This list provided by the League of Professional System Administrators http://lopsa.org/
