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Using Raid 4/5 for Time Machine Backup on Big Sur.

(@ichavis)
Eminent Member Customer

Hello,  I thought that Big Sur has native R4/5 support with out running Softraid if a volume was already formatted?  If so,  would it be possible to backup to Time machine with a R4/5 volume and be able to restore if needed from recovery mode ,  etc?

 

Thanks and apologize if this has been covered before.  Ira

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Topic starter Posted : 04/02/2021 10:52 pm
(@softraid-support)
Member Admin

Yes the driver is bundled with all intel machines. So yes you could restore.

the one thing to know is Time machine apparently only works with APFS SoftRAID volumes, it does not work with HFS for some reason. And yes, you can Recovery Mode startup to restore from a Time Machine backup on a SoftRAID volume.

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Posted : 05/02/2021 3:32 am
(@smayer97)
Eminent Member Customer

I do not follow that answer.... are you saying that if you have a HFS SoftRAID volume, Time Machine will no longer back it up or be able to restore to it? This was never the case historically. If so, since what version of macOS or SoftRAID is this the case?

 

Am I misunderstanding something?

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Posted : 05/02/2021 8:34 am
(@softraid-support)
Member Admin

@smayer97

I confirmed this before replying to you. This may be a bug in Big Sur, or it may be intentional.

If you try to assign an HFS SoftRAID volume to Time Machine with Big Sur, it spins its wheels forever, never starting.

If the target volume is APFS, it works immediately.

I backed up a system onto a test SoftRAID APFS volume, then started in internet recovery mode and was able to see and select the SoftRAID volume for recovery. (I did not go through with the recovery, but I am confident it will restore normally)

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Posted : 05/02/2021 10:55 am
(@smayer97)
Eminent Member Customer

So to be clear, is this isolated to Big Sur or does this issue also apply to Catalina and earlier?

And if just to Big Sur, is this just the latest update, e.g. 11.2, as it a problem with M1, or all versions of Big Sur and all hardware?

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Posted : 05/02/2021 11:02 am
(@ichavis)
Eminent Member Customer

Great,  that is what i needed to know... my time machine is APFS for Raid 1 now..but wanted to add more disks to my Thunderbay to scale it out in size.. so i will add 2 more disks and reconfigure to Raid4 and then format APFS...

 

thanks!

Ira

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Topic starter Posted : 05/02/2021 11:31 am
(@softraid-support)
Member Admin

@smayer97

This appears to be new with all Big Sur systems. But I have not tested extensively. I have never gotten a HFS SoftRAID volume to be accepted by Time Machine under Big Sur.

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Posted : 05/02/2021 11:43 am
(@smayer97)
Eminent Member Customer

@softraid-support Some more clarifying questions...

Is Time Machine not working on Big Sur RAID limited to SoftRAID or is it the same with AppleRAID?

And does this apply to all RAIDs or only certain ones?

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Posted : 05/02/2021 11:58 am
(@softraid-support)
Member Admin

@smayer97

I would have to test Apple RAID, I don't know. This APFS issue affects all SoftRAID volumes, even non RAID.

Ultimately, I expect this to be on all Time Machine backups, it seems the kind of thing that Apple would ultimately enforce

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Posted : 05/02/2021 2:33 pm
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