Can you mix drive s...
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Can you mix drive sizes?

New Member

I have a 4-bay RAID with 4 x 3TB drives striped as RAID 0 using Apple RAID.  I have a disk failing, and replaced it with a spare 6TB drive .  But I still end up with a 12TB RAID, not 15TB.  Can you combine different drive sizes in a SoftRAID and get that extra capacity?

Topic starter Posted : 06/02/2021 1:46 pm
Member Admin

No. In a formal RAID volume, all partitions are the same size. You could use the extra space as a non RAID volume, however.

Posted : 06/02/2021 3:09 pm
Eminent Member

Right, SoftRAID cannot handle this, and no stripped RAID can possibly handle this as every (sufficiently large) write must be striped to different partitions.

There are enterprise-level RAID systems that permit you to create volumes by logically concatenating "plexes", each of which provides a section of storage that can be RAID in different ways, so such systems could allow you to create a volume by creating (12 TB volume striped across 4 drives) concatenated with a (3 TB volume on one drive.) However, neither SoftRaid nor Apple RAID permit this kind of configuration.

Posted : 07/02/2021 8:45 pm