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We are digital librarians. Among us are represented the various reasons to keep data -- legal requirements, competitive requirements, uncertainty of permanence of cloud services, distaste for transmitting your data externally (e.g. government or corporate espionage), cultural and familial archivists, internet collapse preppers, and people who do it themselves so they're sure it's done right. Everyone has their reasons for curating the data they have decided to keep (either forever or For A Damn Long Time (tm) ). Along the way we have sought out like-minded individuals to exchange strategies, war stories, and cautionary tales of failures.

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How does Unraid compare to Sybology's SHR? (alien.top)

submitted 1 year ago by [email protected] to c/[email protected]

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I currently use a Synology NAS + Expansion unit. Devided over different pools, one with SHR-2 for 8 drived and one with SHR-1 for 5 drives.

Im going to build a seperate server to run all my dockers. I initially planned to keep my media files on the NAS and connect it through SMB with my server. The more I look into Unraid, the more interesting it becomes to move my drives to the server itself.

But besides the fact that im not sure how I would fit 13 drives into a pc case, I'm also not sure how safe Unraid is. I've read that there is 1 (or 2) parity drives, but does this mean that these drives always spin up with everything you do? Wouldn't that shorten its lifespan significantly compared to a SHR configuration?

With Synology I can setup a scheduled checksum that checks all my drives and even repairs data (bitrot for example). Is this something Unraid can do too?

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[–] [email protected] 1 points 1 year ago

I've read that there is 1 (or 2) parity drives, but does this mean that these drives always spin up with everything you do? Wouldn't that shorten its lifespan significantly compared to a SHR configuration?

SHR is mdadm RAID. It means:

you can lose more data than the drives you've lost
you MUST to spin up ALL drives for mostly everything
you need all the disks as well in some kind of service recovery situation (like for example you still have all the disks fine but your box died, you need all 8 or whatever number of disks to be connected to do anything, can't just take one disk and use the data from there)

If you WANT to spin all drives all the time with unraid of course you CAN do that, but otherwise you CAN spin up only the one from where you read (or the one you write to + the parity). That is of course an advantage, you can do as you wish.