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A while ago (about 6 months) I set up what I thought was hardware RAID 1 in my BIOS (using the Intel Rapid Storage feature). In Windows the Intel storage manager recognised the RAID volume and synced everything across. I have now discovered that my Ubuntu partition was not syncing between the two disks. How can I set it to respect what I now know is fake RAID, and use the disk that it has been using most recently (sda) to synchronise? The only entry under /dev/mapper/ is control. When using the Live CD the RAIDed partitions appear in /dev/mapper.

Update: I am now working with RAID disabled until this is fixed.

ppetraki
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Dylan
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1 Answers1

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What you have is known as fakeraid as it doesn't have any hardware acceleration at all, it's just a gimmick that moves simple RAID creation out of the operating system and into the firmware. It's only real benefit is sharing the RAID between multiple operating systems, but that also means you're trusting multiple operating systems to update the metadata consistently and not barf on each other. I try to avoid it like the plague.

https://help.ubuntu.com/community/FakeRaidHowto

Should answer all your questions. The original intend supporting this was to help new users migrate from Windows without having to nuke their hard drives. However once you get established, it's probably a good idea to migrate to a more robust raid driven by mdadm or even a HW RAID.

So assuming dmraid is installed, what happens after it scans your disks? Something should show up in /dev/mapper. The intel metadata format is the defacto standard for this, so it should "just work", unless that is the drives are already in use by the operating system. Be sure to reboot after installing dmraid, backing up critical files before hand is also a good idea.

ppetraki
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