2012-10-14T21:23:15Z Photos, electronics, cnc, and more Jeff Eplerjepler@unpythonic.net 2012-10-14T21:23:15Z 2012-10-14T21:23:15Z https://gamma.unpythonic.net/01350249795 Something was strange after a recent reboot—a certain partition didn't seem to have its current contents in it. <p>I soon discovered that instead of mounting the filesystem, an lvm snapshot of the filesystem was mounted instead <p>This occurred because I had an fstab line of the form <pre> UUID=821f.... /store/whatever </pre> and <strong>both the original filesystem and the snapshot have the same UUID</strong>! <p>This is perhaps obvious when you think about what an lvm snapshot <strong>is</strong>, but it sure led to an unexpected result! <p>Lesson: when using lvm, specify mounts using the /dev/pvname/lvname notation unless you're sure you'll never use snapshots. 2011-08-13T17:58:53Z 2011-08-13T17:58:53Z https://gamma.unpythonic.net/01313258333 Earlier this year, I began using a setup with LVM inside of a RAID5. RAID5 gets me 2TB of storage from 3 1TB drives, with redundancy in the case of the failure of a single disk, while LVM gets me the ability to allocate and resize individual filesystems at will. However, I had a problem that prevented my system from booting unattended, which became a big problem when there was a storm-related power failure while I was out of town.