RAID 5 with 4 HDD one Failed how to reassamble the RAID .. not possible unter the GUI
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but before i do this..is there a chance to create a raid 5 out of the 3 disks 2,3,4 just to access the data.i have a bad feeling to reassamble the raid with 4 disks as first step
sda is the orginal "defective" disk .. now replaced and in raid 1 statusSDB disk 2SDC Disk 3And SDD Disk 4 these three are in Hot Spare status (unter the GUI of the NAScorrect. ?0 -
is there a chance to create a raid 5 out of the 3 disks 2,3,4 just to access the data.Yes. That's what we are doing, creating a 4 disk raid5 array out of 3 disks and a missing.i have a bad feeling to reassamble the raid with 4 disks as first stepAFAIK that can't be done, here. As the 4th disk doesn't 'fit' in the array, it can't be used in an 'assume-clean' array. So the procedure is, build a degraded 'assume-clean' array, and when that is up, you can add a 4th disk.correct. ?Yes. Although from the raid headers I can't deduce what happened. Disk 1 was down, so all remaining members had a '.AAA' status. Then you pulled disk 4. What should have happened is that the remaining disks got the '.AA.' status. Disk 4 keeps it's '.AAA' status, as it couldn't be updated. When you put back disk 4, it wasn't accepted, as disks 2 and 3 both had an '.AA.' status, and the raid manager couldn't possibly know what happened to disk 4.But, that actual state of the headers is:
<div>/dev/sdb3:<br> Update Time : Thu Dec 27 22:09:46 2018<br> Device Role : Active device 1<br> Array State : .AAA ('A' == active, '.' == missing)<br>/dev/sdc3:<br> Update Time : Thu Dec 27 22:09:46 2018<br> Device Role : Active device 2<br> Array State : .AA. ('A' == active, '.' == missing)<br>/dev/sdd3:<br> Update Time : Thu Dec 27 22:07:06 2018<br> Device Role : Active device 3<br> Array State : .AAA ('A' == active, '.' == missing)<br></div><div></div>I think you pulled the disk at Thu Dec 27 22:09:46 2018. Both remaining disks got an update, but only sdc2 got a 'sdd3 missing' flag. Which is strange.Anyway, all 3 disks are not further than 2 minutes 40 out of sync, so even without your story about what actually happened, I would assume this 3 disks contain the needed data to rebuild the array.
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thats the best news at the end of 2018 .. Thank You..so i try my best..will tell you what happens0
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BusyBox v1.19.4 (2017-05-26 16:43:23 CST) built-in shell (ash)
Enter 'help' for a list of built-in commands.
~ # mdadm --stop /dev/md2
mdadm: error opening /dev/md2: No such file or directory
~ # mdadm --stop /dev/md2
mdadm: error opening /dev/md2: No such file or directory
~ # mdadm --create --assume-clean --level=5 --raid-devices=4 --metadata=1.2 --chunk=64K --layout=left-symmetric /dev/md2 missing /dev/sdb3 /dev/sdc3 /dev/sdd3
mdadm: /dev/sdb3 appears to be part of a raid array:
level=raid5 devices=4 ctime=Sun Aug 30 17:00:06 2015
mdadm: /dev/sdc3 appears to be part of a raid array:
level=raid5 devices=4 ctime=Sun Aug 30 17:00:06 2015
mdadm: /dev/sdd3 appears to be part of a raid array:
level=raid5 devices=4 ctime=Sun Aug 30 17:00:06 2015
Continue creating array? ymdadm: array /dev/md2 started.and the nas is Beeping (alert)
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Oh YEAH
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only thing to cross the fingers that not one of the disks spread the wings before the 50 hours are DONE
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Thank you very much for your Help...
the RAID is back up an running..
the missing data is now save an copied to another disk.
We need more people like you that spend time for the Problems of strangers.. in this
World today.
Best regards
Bernd
0
Freshman Member
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