On Fri, Apr 29, 2016 at 03:45:31PM +0000, matthew patton wrote: > > ~35GB each, meaning 35000 GB is available and 25000 is > > in use, then it is not a lie to say to any individual customer: you can > > use 50GB if you want. > > If enough of your so-called customers decide to use the space you promised them AND THAT THEY PAID FOR and instead they get massive data loss and outages, you can bet your hiney they'll sue you silly. Executive summary: you shouldn't just take a wild guess and then turn your back on a thin-provisioned setup; you must understand your consumers and monitor your resources. It's reasonable in certain circumstances for a service provider to over-subscribe his hardware. He would be well advised to monitor actual allocation closely, to keep some cash or ready credit on hand for quick expansion of his real hardware, and to respond promptly by adding capacity when usage nears real hardware limits. He is taking a risk, betting that most customers won't max out their promised storage, and should manage that risk. Indeed, he should first gather statistics to understand the behavior of typical customers and determine whether he would be taking a *foolish* risk. Failure to adequately manage resources to redeem contracted promises is the provider's lie, not LVM's. Failure to plan is planning to fail. If that's too scary, don't use thin provisioning. -- Mark H. Wood Lead Technology Analyst University Library Indiana University - Purdue University Indianapolis 755 W. Michigan Street Indianapolis, IN 46202 317-274-0749 www.ulib.iupui.edu
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