On Fri, Oct 03, 2008 at 09:48:39AM +0300, Artem Bityutskiy wrote: > Sorry for my ignorance, but why "discard" is used in hard drive? What > may it improve? I've always been thinking it is only useful for SSD and > other FTL-enabled beasts. If you look at the work being done in T10, it's also envisaged as being useful for large storage arrays where you do "thin provisioning" -- eg pretend that twenty clients each have a terabyte of disc and only buy five terabytes of disc for the array. When they start to use four terabytes, you'll buy some more discs for it, and nobody will ever know. In order to make this work well, you have to know when files really have been deleted. -- Matthew Wilcox Intel Open Source Technology Centre "Bill, look, we understand that you're interested in selling us this operating system, but compare it to ours. We can't possibly take such a retrograde step." -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
