Migration/Expansion not recognized by mac OS Catalina

  • Last Post 31 March 2020
Fabian Auchter posted this 29 March 2020

Hy, I recently epanded my RAID 5 on a Pegasus 2 R4 from 4x2TB to 4x6TB. So where there were 8TB resp 6TB usable there now should be 24TB resp 18TB usable. So first I swaped ony by one and let the RAID ruild. Then I Migrated it with Promise Utility and now it appears that there are like TWO partitions. One still being 6 6TB and than one with 12 TB of free space. I attached the screenshot from my disk utility. Thanks for any advice!

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Raghuraman Kannan posted this 31 March 2020

Hi Fabian,

Rebuilding will not increase the size of the Logical Drive when you just replace one drive , To get the maximum capacity, all the drives have to be replaced at the same time after backing up the data.

The below link should give you more details.


Thanks !

Fabian Auchter posted this 31 March 2020

Oh, ok. This is a real bummer beacuse, how do I backup 6 TB of Data! I would need another Drive as big as this and as a private person this is getting really expensive. What is the migration tool then for?  How do I proceed once I presumably made this backup to another disk?