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Forum Discussion
Is XRaid2 dual-redundancy more reliable than RAID6?
1. Or is it basically just RAID6 under the covers? I read somewhere that ReadyNAS used its own scripts to handle expansion of capacity and a few other things for XRaid2, but I didn't know if that mea...
- X-RAID2 dual-redundancy uses RAID-6. You would disable X-RAID, delete the default volume, create a RAID-6 volume (preferably called "data" - no quotes) then turn X-RAID back on.
- We use mdadm RAID. We have bit-rot protection (enabled at a per share level), so if in normal use of the NAS, the checksum fails then we will attempt to repair the problem by examining the mdadm layer. If the checksum is good for the mdadm layer we will then use that to repair the problem. There is scheduled volume maintenance that can be run e.g. scrubbing. With bit-rot protection enabled scrubbing would check to make sure that the data is good and see if it can fix problems.
- UREs can mess up a RAID rebuild. RAID-6 can withstand problems with two disks only. So if you are rebuilding it could only survive problems with one of the other disks that was already in the NAS before adding the replacement disk. It might be possible to try to attempt data recovery in a situation where a URE brings down the RAID but this may be partially or wholly unsuccessful. Backups are important.
I think at this point with RAID-6 you're unlikely to need to do a full restore from backup but best to be prepared just in case.
- X-RAID2 dual-redundancy uses RAID-6. You would disable X-RAID, delete the default volume, create a RAID-6 volume (preferably called "data" - no quotes) then turn X-RAID back on.
- We use mdadm RAID. We have bit-rot protection (enabled at a per share level), so if in normal use of the NAS, the checksum fails then we will attempt to repair the problem by examining the mdadm layer. If the checksum is good for the mdadm layer we will then use that to repair the problem. There is scheduled volume maintenance that can be run e.g. scrubbing. With bit-rot protection enabled scrubbing would check to make sure that the data is good and see if it can fix problems.
- UREs can mess up a RAID rebuild. RAID-6 can withstand problems with two disks only. So if you are rebuilding it could only survive problems with one of the other disks that was already in the NAS before adding the replacement disk. It might be possible to try to attempt data recovery in a situation where a URE brings down the RAID but this may be partially or wholly unsuccessful. Backups are important.
I think at this point with RAID-6 you're unlikely to need to do a full restore from backup but best to be prepared just in case.
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