Date: Fri, 9 Feb 2007 15:31:43 -0800 (PST) From: Arone Silimantia <aronesimi@yahoo.com> To: freebsd-fs@freebsd.org Subject: Re: comments on newfs raw disk ? Safe ? (7 terabyte array) Message-ID: <391245.1485.qm@web58602.mail.re3.yahoo.com>
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On Fri, 9 Feb 2007, Eric Anderson wrote: > I have 5 10Tb file systems (and some 2Tb ones, but who cares about those > tiny things? :)), and I can tell you that an empty huge file system is > pretty easily fsck-able, but a full one will kill you. It greatly > depends on how many files (inodes) you have used on the file system. If > you have a massive amount of small files, you'll be eating up a ton of > memory. My 'rule of thumb' for my data (which averages to about > 16k/file) is 1G of memory for each 1Tb of disk space used. So, on a > 10Tb file system, if I ever want the fsck to complete, I need an AMD64 > box with *at least* 10G of memory, plus a lot of time. A *lot* of time. > By 'a lot', I mean anywhere from a day, to several days. So ... the time it takes to fsck is not a function of how many inodes are actually initialized from newfs, but how many you are _actually using_ ? But the amount of memory the fsck takes is a function of how many inodes exist, regardless of how many you are actually using ? Are those two interpretations correct ? --------------------------------- Everyone is raving about the all-new Yahoo! Mail beta.
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