RAID 0 to RAID 1+0 Data Loss?

So it seems that the only way to convert a RAID 1 to a RAID 1+0 is to first create a RAID 0 with new drives, copy the content from then RAID 1, then use SoftRAID to convert the RAID 0 to a RAID 1 + 0 using the original drives.

Posted by: @softraid-support

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@smayer97 
No, we only support RAID 1+0 one way and do not support any conversion that requires moving data around the disks. (Like converting 0 to 1, 1 to 0, RAID 0 to RAID 5, etc.)

Did any older version of SoftRAID ever support converting a RAID 0 to 1 or RAID 1 to 0, then the feature taken out?

@smayer97 

Sorry, no.

We have never had a feature of converting Mirrors to Stripe volumes, or Converting RAID 1 Mirrors to RAID 1+0.

@softraid-support Thanks for testing and for your confirmation. I finally got around to attempting this today but the conversion didn't seem to actually begin after triggering. To recap:

I have a 2-drive RAID 0 volume named Gringotts (36TB, HFS+) on SoftRAID 8.6.1, macOS Tahoe 26.4 (build 25E246), OWC ThunderBay 4. I initialized two new drives successfully and issued the Convert Volume → RAID 1+0 command. The log shows the conversion command being issued but the actual sync never starts — iostat shows zero sustained activity on the new drives and the volume still shows as Stripe. The UI had showed unmounting and "changing raid level" for about a minute or so before stopping completely, without any other obvious UI indicators of progress or success. Attaching support report."

Could you please advise?

@mochidust 
Manually unmount your volume first, and try again. the disks were never attached to the existing volume, my guess is the volume could not be updated. See if that works.