apple raid missing disk

Hello,

i have apple raid concatenated JBOD 4 disks storage, without redundancy, everything was working normal when the power goes down and did not come back to mount the raid unit, the hard disks are working perfectly without problems, it is only logical problem of the raid partition that has lost a slice and does not mount more, I have personal files like photos that I do not have backup, who can help me giving tips on how to recover and ride this raid again I will be very grateful.

An Apple concatenated disk set means the disks are accreted together, without any data redundancy, and without any of the performance benefits of RAID 0 when that's used with traditional hard disks.

(RAID 0 means disk striping means similar-sized hunks of the data are scattered across all of the disks with no redundancy. Neither of these approaches are particularly recoverable on hardware failures, unfortunately. RAID 1, RAID 5, RAID 6 and RAID 10 all replicate the data, and will usually permit data recovery after a disk failure.)

With concatenated disks, if there's no backup and if there's no Time Machine, and if powering down the whole configuration and re-seating the failed drive into the bay and powering it all up and trying again doesn't allow access, then you're headed toward acquiring a tool such as DiskWarrior or analogous, or consider contacting a data recovery firm directly to see what they offer and whether they can read and rebuild from the array.

Recovery services will generally require a fee paid, irrespective of whether they're able to recover any data.

panic moves you could try now, before giving up and doing what MrHoffman says, include:

selecting that wandering drive and running repair disk on it. Repeat until it comes clean or gets hopelessly stuck. If it comes clean, use the "mount" button is disk Utility to mount it, then see if the RAID will accept it back, or what status it gets.

Grant Bennet-Alder wrote:

panic moves you could try now, before giving up and doing what MrHoffman says, include:

selecting that wandering drive and running repair disk on it. Repeat until it comes clean or gets hopelessly stuck. If it comes clean, use the "mount" button is disk Utility to mount it, then see if the RAID will accept it back, or what status it gets.

I'm hesitant to recommend sending a whole lot of I/O at a sketchy or failing hard disk drive, as I'd rather (try to) leave the last few "gasps" for the recovery service to try to use during data recovery, rather than finishing off whatever might be failing within the drive with what may be a futile effort to repair it. If it reads at all and if I were inclined to send a fair amount of I/O at a hard disk, I'd tend to try to do a dd-style disk image first, to try to capture whatever data was still readable, while it was still readable. Hard disks don't always degrade evenly or even gracefully, though once they start going visibly weird they're usually pretty far toward gone.

Excellent point, MrHoffman!

My direct "school of hard knocks" experience with Apple RAID is only with Mirrored RAID. I had an instance where one disk dropped out, and it appeared that at the first sign of a Bad Block, it broke the RAID and the errant drive wandered off. I repaired that Bad Block problem once, rebuilt the mirrored RAID from the good drive, and went on with it.

So the on topic part of my story is:

that at the first sign of trouble, the RAID seems to split (at least that is what the mirrored RAID did.) There may still be enough life in it to copy most stuff off.

... back to my "story" and what else I learned:

Then that same RAID drive developed another bad block shortly thereafter. I was not happy about it breaking my RAID again, but while stewing about it I realized that was EXACTLY the behavior I wanted. If the drive had the slightest problem, it was no longer good enough to hold my precious data, and needed to be replaced with a drive that worked absolutely perfectly.

Your suggestions that backups are still needed, even with Mirroring, rings true here.

all 4 hard disk 8tb are working perfectly, are new, what happened was lack of power and the raid does not mount anymore, I tried to recover the diskwarrior but the unit does not appear, I rode rstudio mounting the missing disk, mounted a similar raid but in data recovery fails 25% which is exactly the missing disk, I'm going to consider your tip to take in a data recovery company, thank you for responding and trying to help.

Sorry for the post repeated, gave some problem here at the time of reply, I thought of making a picture of this hd with the DD to another hard disk and remove from the raid and insert again, my question would be if when to include in the raid, will it be formatted? the autorebuild works on the other raid like raid1, does it work as concatenated jbod?

I'm thinking of giving some command to remove and reinsert the disk that gave error with commands in the terminal:

diskutil appleraid remove 66E9EDE0-5F1D-4656-990D-CFEA511F252E disk7S2

diskutil addtoRAID member disk7S2 66E9EDE0-5F1D-4656-990D-CFEA511F252E

and diskutil checkraid

Will it work? When you insert the hard disk again will it format this drive? Can you ride the raid?

最後更新：2017-10-13 23:18:43

apple raid missing disk

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