RAID 0+1 Data Recovery
RAID 0+1 creates two RAID 0 stripes and mirrors one onto the other. It gives good speed with redundancy, but it can tolerate less failure than it appears: once one drive fails, its whole stripe is out of service.
A second failure in the remaining stripe then takes the array offline. We rebuild the array by combining working drives from both stripes.
Common RAID 0+1 Failures
- Drive failures in both stripe sets
- Controller confusion between RAID 0+1 and RAID 10 layouts
- Failed rebuild of a stripe set
- Lost configuration after a hardware change
How We Recover a RAID 0+1 Array
We rebuild each RAID 0 stripe set separately, then compare them to find which set holds the most recent data. Because the two sets are mirrors, a failed disk in one set can often be substituted by the matching disk from the other, letting us assemble one complete stripe even when both sets have a failure – as long as the failures are not in the same position in each set.
Before You Do Anything
If your array has failed: do not force a rebuild, re-initialise the array, run CHKDSK/fsck, or swap drives between slots. Label every disk with its slot number, shut the system down cleanly if you can, and call us on 020 7064 4996. Most unrecoverable RAID cases we see were made worse by a rebuild attempted on the wrong disk.
See RAID & server data recovery for the servers, controllers and NAS systems we support.
Frequently asked questions
What is the difference between RAID 0+1 and RAID 10?
RAID 0+1 mirrors two stripes; RAID 10 stripes across mirrored pairs. RAID 10 is more resilient. We recover both, and identifying which layout was used is part of our analysis.
Free assessment, no obligation. Call 020 7064 4996 or use the form on this page – an engineer will tell you what can be recovered and what it will cost. Book online · Pricing · Locations