Re: Using core storage / logical volumes to extend a partition

[@lbutlr]

On 20 Jul 2017, at 12:29, Thomas Baley  wrote:
> I haven't seen "core" storage for decades. 

CoreStorage is the name of the collection of technologies Apple uses for many 
drives. For example, a fusion drive is a core storage volume. A boot volume is 
a CoreStorage volume as well.

$ diskutil coreStorage list

(or use cs instead)

-- 
Apple broke AppleScripting signatures in Mail.app, so no random signatures.

___
MacOSX-talk mailing list
MacOSX-talk@omnigroup.com
http://www.omnigroup.com/mailman/listinfo/macosx-talk

Re: Using core storage / logical volumes to extend a partition

[Andy Ringsmuth]

> On Jul 20, 2017, at 12:31 PM, Michael  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.


-Andy
___
MacOSX-talk mailing list
MacOSX-talk@omnigroup.com
http://www.omnigroup.com/mailman/listinfo/macosx-talk

Re: Using core storage / logical volumes to extend a partition

[Macs R We]

I bought one of these  years 
ago for a song.  It's not state-of-the-art tech today, but it continues to work 
fine when I need it, and even does LightScribe (for when that was a thing).  
The guy at the link has a new unit for $15 buy-it-now, which is a pretty fair 
price to escape Apple brain damage.

> On Jul 20, 2017, at 7:44 PM, Michael  wrote:
> 
> 
> On 2017-07-20, at 7:15 PM, Macs R We  wrote:
> 
>>> 
>>> On Jul 20, 2017, at 6:09 PM, Michael  wrote:
>>> 
>>> 
>>> On 2017-07-20, at 1:22 PM, Macs R We  wrote:
>>> 
 Number one, a bigger hub would probably be the cheapest and most efficient 
 way out of your problem.
 
 Number two, I can't imagine there's anything magic about an Apple optical 
 that requires it to be directly connected, as long as you have a powered 
 hub, which you want to have anyway. Sure, possibly you won't be able to 
 boot from it, but who does that anymore?
>>> 
>>> Actually, attempting to plug it into a hub does bring up a "This drive must 
>>> be directly connected to the computer" message. Apparently, the computer 
>>> will provide more power than a normal (even powered) hub will when a device 
>>> asks in an Apple manner.
>> 
>> Well, damn.  Yeah, I was aware of the hardware hack in Apple products where 
>> if you plug an iPad (and maybe an iPhone) into a Mac, they negotiate for the 
>> double-secret-probation nonstandard-high-current quick-charge option over 
>> the USB port, which the Mac will give to no other device.  I was unaware 
>> this hack extended to opticals.  Now I'm curious as to what the hell an 
>> optical thinks it needs all that extra power for.
> 
> I don't know, but i'm really unhappy to have an apple optical :-)
> 
> ---
> Entertaining minecraft videos
> http://YouTube.com/keybounce
> 

___
MacOSX-talk mailing list
MacOSX-talk@omnigroup.com
http://www.omnigroup.com/mailman/listinfo/macosx-talk

Re: Using core storage / logical volumes to extend a partition

[Michael]

On 2017-07-20, at 7:15 PM, Macs R We  wrote:

>> 
>> On Jul 20, 2017, at 6:09 PM, Michael  wrote:
>> 
>> 
>> On 2017-07-20, at 1:22 PM, Macs R We  wrote:
>> 
>>> Number one, a bigger hub would probably be the cheapest and most efficient 
>>> way out of your problem.
>>> 
>>> Number two, I can't imagine there's anything magic about an Apple optical 
>>> that requires it to be directly connected, as long as you have a powered 
>>> hub, which you want to have anyway. Sure, possibly you won't be able to 
>>> boot from it, but who does that anymore?
>> 
>> Actually, attempting to plug it into a hub does bring up a "This drive must 
>> be directly connected to the computer" message. Apparently, the computer 
>> will provide more power than a normal (even powered) hub will when a device 
>> asks in an Apple manner.
> 
> Well, damn.  Yeah, I was aware of the hardware hack in Apple products where 
> if you plug an iPad (and maybe an iPhone) into a Mac, they negotiate for the 
> double-secret-probation nonstandard-high-current quick-charge option over the 
> USB port, which the Mac will give to no other device.  I was unaware this 
> hack extended to opticals.  Now I'm curious as to what the hell an optical 
> thinks it needs all that extra power for.

I don't know, but i'm really unhappy to have an apple optical :-)

---
Entertaining minecraft videos
http://YouTube.com/keybounce

___
MacOSX-talk mailing list
MacOSX-talk@omnigroup.com
http://www.omnigroup.com/mailman/listinfo/macosx-talk

Re: Using core storage / logical volumes to extend a partition

[Macs R We]

> On Jul 20, 2017, at 6:09 PM, Michael  wrote:
> 
> 
> On 2017-07-20, at 1:22 PM, Macs R We  wrote:
> 
>> Number one, a bigger hub would probably be the cheapest and most efficient 
>> way out of your problem.
>> 
>> Number two, I can't imagine there's anything magic about an Apple optical 
>> that requires it to be directly connected, as long as you have a powered 
>> hub, which you want to have anyway. Sure, possibly you won't be able to boot 
>> from it, but who does that anymore?
> 
> Actually, attempting to plug it into a hub does bring up a "This drive must 
> be directly connected to the computer" message. Apparently, the computer will 
> provide more power than a normal (even powered) hub will when a device asks 
> in an Apple manner.

Well, damn.  Yeah, I was aware of the hardware hack in Apple products where if 
you plug an iPad (and maybe an iPhone) into a Mac, they negotiate for the 
double-secret-probation nonstandard-high-current quick-charge option over the 
USB port, which the Mac will give to no other device.  I was unaware this hack 
extended to opticals.  Now I'm curious as to what the hell an optical thinks it 
needs all that extra power for.

___
MacOSX-talk mailing list
MacOSX-talk@omnigroup.com
http://www.omnigroup.com/mailman/listinfo/macosx-talk

Re: Using core storage / logical volumes to extend a partition

[Michael]

On 2017-07-20, at 1:22 PM, Macs R We  wrote:

> Number one, a bigger hub would probably be the cheapest and most efficient 
> way out of your problem.
> 
> Number two, I can't imagine there's anything magic about an Apple optical 
> that requires it to be directly connected, as long as you have a powered hub, 
> which you want to have anyway. Sure, possibly you won't be able to boot from 
> it, but who does that anymore?

Actually, attempting to plug it into a hub does bring up a "This drive must be 
directly connected to the computer" message. Apparently, the computer will 
provide more power than a normal (even powered) hub will when a device asks in 
an Apple manner.

And yes, a bigger hub is an answer. I did not know of bigger ones. I've only 
ever seen 4-port USB hubs being sold, and thought that was some limit of the 
protocol (figured a two-bit enumeration at some point in the connection 
protocol.)


> 
>> On Jul 20, 2017, at 1:12 PM, Michael  wrote:
>> 
>> 
>> On 2017-07-20, at 12:51 PM, Andy Ringsmuth  wrote:
>> 
 
 On Jul 20, 2017, at 12:31 PM, Michael  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
>> MacOSX-talk@omnigroup.com

Re: Using core storage / logical volumes to extend a partition

[Macs R We]

Number one, a bigger hub would probably be the cheapest and most efficient way 
out of your problem.

Number two, I can't imagine there's anything magic about an Apple optical that 
requires it to be directly connected, as long as you have a powered hub, which 
you want to have anyway. Sure, possibly you won't be able to boot from it, but 
who does that anymore?

> On Jul 20, 2017, at 1:12 PM, Michael  wrote:
> 
> 
> On 2017-07-20, at 12:51 PM, Andy Ringsmuth  wrote:
> 
>>> 
>>> On Jul 20, 2017, at 12:31 PM, Michael  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
> MacOSX-talk@omnigroup.com
> http://www.omnigroup.com/mailman/listinfo/macosx-talk

___
MacOSX-talk mailing list
MacOSX-talk@omnigroup.com
http://www.omnigroup.com/mailman/listinfo/macosx-talk

Re: Using core storage / logical volumes to extend a partition

[Macs R We]

His point is that it's relatively straightforward using Apple tools to modify 
the size of the last partition on a drive, but modifying the size of any of the 
partitions except the last is a complete pain in the butt.

I haven't played with these tools very much, but there are a number of webpages 
out there that illuminate the usage of some of the tools of Core Storage with 
respect to the process of creating a roll-your-own Fusion Drive. I did do this 
once, and was successful, but my recollection (and I may be wrong) is that the 
process did require you to destroy the existing volume in order to add to it, 
which is not what you want.

Another approach is to use the partition resizing tools found in Drive Genius. 
They take a while to run, but I have found them to be very reliable. They can 
alter the size of any of the partitions on the drive, not just the last, and 
they can also "slide" partitions back-and-forth on the drive to eliminate 
wasteful inter-partition unused regions. 

> On Jul 20, 2017, at 11:29 AM, Thomas Baley  wrote:
> 
> I haven't seen "core" storage for decades. 
> 
> What does it matter, which partition is where, physically, on the drive? Are 
> you thinking it is faster to have one arrangement versus another? It is not. 
> 
> 
> 
> Sent from my iPhone
> Thomas Baley
> t...@acm.org
> (404) 307-6428
> www.linkedin.com/in/tbaley
> 
>> On Jul 20, 2017, at 13:31, Michael  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?
>> 
>> (10.9.5, in case that matters).
>> 
>> ---
>> Entertaining minecraft videos
>> http://YouTube.com/keybounce
>> 
>> ___
>> MacOSX-talk mailing list
>> MacOSX-talk@omnigroup.com
>> http://www.omnigroup.com/mailman/listinfo/macosx-talk
> ___
> MacOSX-talk mailing list
> MacOSX-talk@omnigroup.com
> http://www.omnigroup.com/mailman/listinfo/macosx-talk

___
MacOSX-talk mailing list
MacOSX-talk@omnigroup.com
http://www.omnigroup.com/mailman/listinfo/macosx-talk

Re: Using core storage / logical volumes to extend a partition

[Andy Ringsmuth]

> On Jul 20, 2017, at 3:12 PM, Michael  wrote:
> 
> 
> On 2017-07-20, at 12:51 PM, Andy Ringsmuth  wrote:
> 
>>> 
>>> On Jul 20, 2017, at 12:31 PM, Michael  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.

Get a bigger hub.  :-)

Is 28 ports enough?

https://www.amazon.com/Manhattan-Port-USB-Hub-161718/dp/B0074024XU

OK, so that one gets sucky review, but still, you can always get a hub with 
more ports on it.

-Andy
___
MacOSX-talk mailing list
MacOSX-talk@omnigroup.com
http://www.omnigroup.com/mailman/listinfo/macosx-talk

Re: Using core storage / logical volumes to extend a partition

[Michael]

On 2017-07-20, at 12:51 PM, Andy Ringsmuth  wrote:

>> 
>> On Jul 20, 2017, at 12:31 PM, Michael  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
MacOSX-talk@omnigroup.com
http://www.omnigroup.com/mailman/listinfo/macosx-talk

Re: Using core storage / logical volumes to extend a partition

[Thomas Baley]

I haven't seen "core" storage for decades. 

What does it matter, which partition is where, physically, on the drive? Are 
you thinking it is faster to have one arrangement versus another? It is not. 



Sent from my iPhone
Thomas Baley
t...@acm.org
(404) 307-6428
www.linkedin.com/in/tbaley

> On Jul 20, 2017, at 13:31, Michael  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?
> 
> (10.9.5, in case that matters).
> 
> ---
> Entertaining minecraft videos
> http://YouTube.com/keybounce
> 
> ___
> MacOSX-talk mailing list
> MacOSX-talk@omnigroup.com
> http://www.omnigroup.com/mailman/listinfo/macosx-talk
___
MacOSX-talk mailing list
MacOSX-talk@omnigroup.com
http://www.omnigroup.com/mailman/listinfo/macosx-talk