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1

Let's assume the following: A RAID 5, 3 disk (5TB each) array. Already we're off to a terrible start. If a disk fails, the data remains accessible (e.g. employees could continue working) but in a 'crippled' state. Assuming that there is no URE on one of the remaining two disks exactly where someone has a file. However, what is to stop you, ...


-2

If you are confident that, HDD is got offline just due to some error, but no issue with HDD. User the command "Force - Online", it will allow disk to come online in few second. Make sure you are 200% sure abt. HDD state, that it's working fine and no issue with it. than only try this command. I tried and it works for me. Out of 2 disk of array 3 of Raid 5, ...


1

How should I try to start rebuild this? Depends on if you care about the data. Assuming you do, there is a guide over here. Note that RAID-5 has some issues, which were enough for me to convert most of our environment to RAID-10 or just plain mirrors. I'm not sure what /dev/md0 is, but if your root (/) filesystem is on there (or any filesystem you're ...


17

Why would you ask the internet about this? There's so much WTF here, that I don't understand where to start!! This question shows a fundamental lack of understanding of hardware, RAID arrays, storage, monitoring, and general IT best-practices. I read this question and can't help but think: Who is actually responsible for this server hardware? Where is ...


10

With RAID 5 you can only lose 1 disk and have your data remain available. You have lost 3 so you will need to rebuild the RAID and then restore the data from backup. We have a canonical Q&A about RAID levels that may help your understanding.



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