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Consecutive Time Machine with 2 8TB Disks

coryndiego

coryndiego

macrumors regular
Original poster
Aug 6, 2008
182
2
San Diego, Ca.
I have 8TB worth of data over several external disks that are accessed weekly/daily. I would like to use Time Machine to backup the full array of disks, then automatically and consecutively update as new information is added.

When I add the two 8Tb disks, each disk backs up fully instead of consecutively as one fills up. I did not add them at the same time and wonder if I am needing to erase and start from fresh, or if I am expecting this to work as anticipated but won't. Can it be configured to overflow onto the next HDD?

Other transferring older information to disks for storage, which only gives me one copy, is it possible to accomplish what I am intending Time Machine to do?

Thanks!
 
I really don't think I understood what you said at all. Cause I don't see the problem? To me what you describe sounds as if it all worked as you expected, but also it clearly seems like that's not the case - could you try and rephrase it for me? Perhaps with a more specific breakdown of disks and expected behaviour for each disk
 
I do not want two backups of the same information on two separate disks, which is what is currently taking place. I want HDD #1 to fill to capacity then the HDD#2 to continue where the first left off.
 
coryndiego said:
two 8tb seagate drives via USB - direct
Click to expand...


You definitely need to start over - Try adding them in TM at the same time and see if that works - if not, go into Disk Utility and set them up either in something like RAID0 or JBOD (concatenated) which means that the OS will see them as 1 16TB disk instead of two 8TB disks
 
One thing isn’t clear to me. Your “several external disks” containing the 8GB of data…are they always mounted or do you connect and eject them as they are being used? I ask because if a disk isn’t mounted TM isn’t going to back it up, of course.
 
Initially when setting up the JBOD I'm only seeing the option for Journaled and Extended but not Encrypted. When I made the JBOD Journaled, added it to Time Machine and checked encrypted I get an error - "You can't convert an AppleRAID volume to Core Storage".

thanks for the help
 
coryndiego said:
Initially when setting up the JBOD I'm only seeing the option for Journaled and Extended but not Encrypted. When I made the JBOD Journaled, added it to Time Machine and checked encrypted I get an error - "You can't convert an AppleRAID volume to Core Storage".

thanks for the help
Click to expand...


Right... OK, so apparently Apple's software RAID doesn't allow for encryption that way, since that encryption scheme uses Core Storage. You could instead set up your drives the same way a Fusion Drive is set up; which is through Core Storage. That should work with encryption for certain. Either that, or use a different encryption scheme, but that can be a bit of a hassle

How nifty are you with the Terminal?

diskutil coreStorage create myLogicalVolGroup /dev/disk1 /dev/disk2

diskutil coreStorage createVolume lvgUUID type name size

should fuse the drives together with Core Storage. Of course replace the "/dev/disk#" with the relevent disk IDs "myLogicalVolGroup" with the name of the group you want, and all elements of the second command after "createVolume" with the relevent details.
 
casperes1996 said:
Right... OK, so apparently Apple's software RAID doesn't allow for encryption that way, since that encryption scheme uses Core Storage. You could instead set up your drives the same way a Fusion Drive is set up; which is through Core Storage. That should work with encryption for certain. Either that, or use a different encryption scheme, but that can be a bit of a hassle

How nifty are you with the Terminal?

diskutil coreStorage create myLogicalVolGroup /dev/disk1 /dev/disk2

diskutil coreStorage createVolume lvgUUID type name size

should fuse the drives together with Core Storage. Of course replace the "/dev/disk#" with the relevent disk IDs "myLogicalVolGroup" with the name of the group you want, and all elements of the second command after "createVolume" with the relevent details.
Click to expand...


I’m pretty good with the terminal... I’ll try that later tonight. Thanks again for your help with this. I’ll update later.
 
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