On 2017-07-20, at 12:51 PM, Andy Ringsmuth <[email protected]> wrote:
>> >> On Jul 20, 2017, at 12:31 PM, Michael <[email protected]> wrote: >> >> So one of my partitions filled up too soon :-). It's on a 4 TB drive, and I >> figured I'd shrink the time machine backup on the same disk to make more >> room. >> >> Except that I found that the partition layout put the time machine partition >> at the front of the drive, and the data partition at the end of the drive. >> >> So my first thought was to look at core storage and logical volumes. The >> thinking was to turn the existing data partition into a logical volume, and >> then add a second logical volume to it -- resizing the data without having >> to copy it. >> >> I can't find anything in diskutil's man page to describe how to add a new >> physical volume to a logical volume. >> >> A "workable" (but slow) solution is to just delete the TM (3 tb), put a copy >> of the data at the front of the drive, and make a new smaller TM at the end. >> That would work, but copying a full TB of data on the same spindle is slow. >> (Not a big deal, just an annoyance). >> >> My question is: What can be done with core storage? How can you add new >> physical volumes to existing partitions? >> >> Perhaps more usefully / generally: Lets say you had a large, 4 TB drive that >> you knew you were going to have different data stored on. You break it up >> into 8 1/2 TB partitions. You want to be able to expand two different >> logical volumes/partitions as needed, not knowing ahead of time which one >> would need how much of the space. >> >> How would something like this be done with core storage, or is this not what >> core storage is intended for? > > Michael, > > Never, never, ever, use Time Machine on a partitioned disk. It defeats the > whole purpose of having a backup. If Time Machine is backing up other items > on that same physical disk, your backup is basically worthless. If the disk > dies, you lose your original data and the backup. > > Disks are cheap. You can get 4TB for around a hundred bucks. Get one > dedicated disk for Time Machine and for absolutely positively nothing else. > > Then, go from there on the rest of your partitions. Ok, so I have a machine with two USB ports. One has a hub. One has my backup drive. One has my DVD drive. So I'm already having to swap things around -- if I plug in the DVD drive (Apple's official drive, won't work in a hub, has to be connected directly), I have to move the external to the hub -- which means any terminal window on there, or anything using stuff on there, gets clobbered. Another drive? How do I hook it up? I'm already filling the hub, and having to plug/unplug things as I go. The primary purpose of the time machine drive is to hold a backup copy of what's on the internal SSD inside the laptop. The secondary purpose is to have space for additional stuff. The drive is pretty much only videos -- either older videos that I'm finished with, or low-priority footage that I'll probably discard instead of using, or archival copies of stuff uploaded to youtube; or videos to watch that I've downloaded off the internet. If my internal drive fails, I have a time machine. If my external drive fails, it's painful, but I have an internet backup (backblaze) that I can restore from, and nothing on that drive is time critical. And yea, "Core" storage hasn't been used in a few decades, but this is ... (dare I say it?) _AppleCore_ :-). (OK, if you don't know your minecraft mods, you won't know "Applecore" :-). --- Entertaining minecraft videos http://YouTube.com/keybounce _______________________________________________ MacOSX-talk mailing list [email protected] http://www.omnigroup.com/mailman/listinfo/macosx-talk
