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Which RAID? (lemm.ee)

submitted 1 day ago by WeAreAllOne@lemm.ee to c/selfhosted@lemmy.world

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Hey everyone. So I'm trying to decide which RAID should I choose for my 6trays NAS. I have 4 x 16TB HDDs, 1x8TB HDD and another one 500GB ssd that I will use as a containers' docker folder usage. I will be using the NAS to store Media files (movies, tv series, photos, music etc.) and also documents. Currently I have the 2 16tb as RAID 1 that only the Media files are stored and I am in between either creating another RAID 1 with the remaining 2 16Tbs or adding them to the other 2 to create a RAID 5 and have a bigger storage pool Have you had any incident where 2 HDDs were lost-damaged simultaneously (as RAID 5 forgives loss of only 1 drive) or not?

In addition I was thinking of having the 8TB HDD as a standalone to backup the documents and maybe the photos and the docker setups.

Does this make sense to anyone that uses similar setup?

Thanks for your inputs!

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[–] CarbonatedPastaSauce@lemmy.world 16 points 1 day ago

In the last 25 years working with approximately 700 servers that used RAID 5 I saw two of them lose an entire volume. Once was due to a malfunctioning HP RAID controller, and the other was due to a second disk dying while the rebuild from the first failure was still ongoing. There turned out to be a systemic problem with that drive model’s firmware which almost certainly contributed.

So in my experience it’s rare but it definitely does happen.

It can get worse. About 20 years ago the company I was at had an EMC tech yank the wrong power supply from a Symmetrix rack, where the other supply had earlier in the day caught fire! We lost that entire rack’s data (customer’s personal email accounts) due to data corruption. It was probably around 300 10k SCSI disks in that rack, a multimillion dollar expense at the time, and we had to restore all of it from tape over many, many days. Really, really sucked.