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pankaj13
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Joined: 05 Sep 2019
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PostPosted: Tue May 05, 2020 1:00 am    Post subject: RAID-1 failure [closed] Reply with quote

Hi,

A friend of mine recently had a computer crash and lost data which made me think about my own set up and can use some help from experts.

I have a Dell T5500 machine that has two disks which are in RAID-1 formation using a h/w RAID controller which I had to setup from BIOS before installing the OS. As per my understanding, RAID-1 will preserve data if one of the disks fail.

So in the event of a single failure what are my options?

1. Boot with only one disk that is working and backup data elsewhere
2. Insert a new disk (same specs) and hope that h/w controller will put things back as normal

Any guidance would be helpful to further my knowledge.

Thanks.


Last edited by pankaj13 on Tue May 05, 2020 3:29 am; edited 1 time in total
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eccerr0r
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Joined: 01 Jul 2004
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PostPosted: Tue May 05, 2020 2:19 am    Post subject: Reply with quote

If it needs to be said again: RAID is not backup. You should be also backing up your RAID to another medium.

Then when the RAID has a disk failure, you should be able to simply remove the failed disk and put in a replacement, and the RAID hardware/software will copy data to the new disk (called a "rebuild"). Once the rebuild completes (and usually during the rebuild time too) you can use the machine as normal, as if nothing happened.

The backup you should have been taking while both disks were working is used if the rebuild fails.

Remember: RAID is not backup. RAID is for uptime - extra insurance your machine doesn't go down or lose data when a disk fails. Both of these still can happen, and your backup comes to the rescue.
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pankaj13
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PostPosted: Tue May 05, 2020 3:29 am    Post subject: Reply with quote

Thanks eccerr0r, that makes sense.

Apreciate the feedback.
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