RAID 0 to RAID 1+0 Data Loss? - Functionality Issues https://forums.softraid.com/softraid-8-functionality-issues/raid-0-to-raid-10-data-loss/ SoftRAID Discussion Board en-US Tue, 21 Apr 2026 23:53:42 +0000 wpForo 60 RE: RAID 0 to RAID 1+0 Data Loss? https://forums.softraid.com/softraid-8-functionality-issues/raid-0-to-raid-10-data-loss/paged/2/#post-24858 Mon, 13 Apr 2026 20:30:32 +0000 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.]]> Functionality Issues SoftRAID Support https://forums.softraid.com/softraid-8-functionality-issues/raid-0-to-raid-10-data-loss/paged/2/#post-24858 RE: RAID 0 to RAID 1+0 Data Loss? https://forums.softraid.com/softraid-8-functionality-issues/raid-0-to-raid-10-data-loss/paged/2/#post-24857 Mon, 13 Apr 2026 20:11:22 +0000 @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."

3210

Could you please advise?

]]> Functionality Issues mochidust https://forums.softraid.com/softraid-8-functionality-issues/raid-0-to-raid-10-data-loss/paged/2/#post-24857 RE: RAID 0 to RAID 1+0 Data Loss? https://forums.softraid.com/softraid-8-functionality-issues/raid-0-to-raid-10-data-loss/paged/2/#post-24793 Tue, 07 Apr 2026 14:45:51 +0000 @smayer97 

Sorry, no.

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

]]> Functionality Issues SoftRAID Support https://forums.softraid.com/softraid-8-functionality-issues/raid-0-to-raid-10-data-loss/paged/2/#post-24793 RE: RAID 0 to RAID 1+0 Data Loss? https://forums.softraid.com/softraid-8-functionality-issues/raid-0-to-raid-10-data-loss/paged/2/#post-24792 Mon, 06 Apr 2026 14:14:20 +0000 @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?

 

]]> Functionality Issues smayer97 https://forums.softraid.com/softraid-8-functionality-issues/raid-0-to-raid-10-data-loss/paged/2/#post-24792 RE: RAID 0 to RAID 1+0 Data Loss? https://forums.softraid.com/softraid-8-functionality-issues/raid-0-to-raid-10-data-loss/paged/2/#post-24791 Mon, 06 Apr 2026 14:12:30 +0000 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.

]]> Functionality Issues smayer97 https://forums.softraid.com/softraid-8-functionality-issues/raid-0-to-raid-10-data-loss/paged/2/#post-24791 RE: RAID 0 to RAID 1+0 Data Loss? https://forums.softraid.com/softraid-8-functionality-issues/raid-0-to-raid-10-data-loss/#post-24788 Fri, 03 Apr 2026 17:36:24 +0000 Yes, each drive would get a Mirror disk "behind" it.]]> Functionality Issues SoftRAID Support https://forums.softraid.com/softraid-8-functionality-issues/raid-0-to-raid-10-data-loss/#post-24788 RE: RAID 0 to RAID 1+0 Data Loss? https://forums.softraid.com/softraid-8-functionality-issues/raid-0-to-raid-10-data-loss/#post-24787 Fri, 03 Apr 2026 17:35:39 +0000 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.)]]> Functionality Issues SoftRAID Support https://forums.softraid.com/softraid-8-functionality-issues/raid-0-to-raid-10-data-loss/#post-24787 RE: RAID 0 to RAID 1+0 Data Loss? https://forums.softraid.com/softraid-8-functionality-issues/raid-0-to-raid-10-data-loss/#post-24783 Thu, 02 Apr 2026 12:16:34 +0000 Also, while on this topic, does SoftRAID have the ability to convert a RAID 1 to a RAID 0, with the addition of at least 2 new drives, e.g. taking drives 1 & 2 and creating a RAID 0 with drives 3 & 4?

]]> Functionality Issues smayer97 https://forums.softraid.com/softraid-8-functionality-issues/raid-0-to-raid-10-data-loss/#post-24783 RE: RAID 0 to RAID 1+0 Data Loss? https://forums.softraid.com/softraid-8-functionality-issues/raid-0-to-raid-10-data-loss/#post-24782 Thu, 02 Apr 2026 12:08:18 +0000 So I understand, would the end result of converting a RAID 0 to RAID 1+0 be that the original drives 1 & 2 would end up in separate groups, such that group 1 would consist of drive 1 and 3 (mirrored) and group 2 would consist of drives 2 & 4 (mirrored)? 

 

]]> Functionality Issues smayer97 https://forums.softraid.com/softraid-8-functionality-issues/raid-0-to-raid-10-data-loss/#post-24782 RE: RAID 0 to RAID 1+0 Data Loss? https://forums.softraid.com/softraid-8-functionality-issues/raid-0-to-raid-10-data-loss/#post-24780 Thu, 02 Apr 2026 03:29:55 +0000

Thank you for the correction and the reference. You are right that the notation is the opposite of what I stated — RAID 1+0 is indeed a stripe of mirrors, and RAID 0+1 is a mirror of stripes.

SoftRAID's RAID 1+0 implementation pairs drives as mirrors and stripes across those pairs, but I had the shorthand notation backwards. I appreciate the correction. (the confusion on my end was because we can convert to a RAID 1+0 starting with RAID 0, not RAID 1)

As for why SoftRAID can convert a RAID 0 to RAID 1+0? it's because a RAID 0 stripe already exists as the top layer.
Converting to RAID 1+0 adds a mirror partner to each drive in the existing stripe, so the stripe layout never changes and no data needs to move.
It's an additive operation rather than a destructive reorganization of data on disk, which makes the conversion process straightforward.

]]> Functionality Issues SoftRAID Support https://forums.softraid.com/softraid-8-functionality-issues/raid-0-to-raid-10-data-loss/#post-24780