I am beginning to properly setup unraid and expand the hard drives and explaining to my wife how unraid works as a redundant system to avoid losing data.

Something she brought up caught me off guard and am curious to find the answer but google has not been friendly to my search.

 

In the event of an emergency like a flood or fire, would I be able to take x number of drives from the hot swap bay and avoid losing data?

 

Setup,

2 X 12TB parity drives

 

14 x 12TB Array Drives

 

2 x 1TB cache SSDs
 

Something tells me no... but I'd love to hear it from the experts.

Edited August 28, 20196 yr by HH0718
Question answered by community.

Any data drive you take can be read completely, since Unraid uses an independent filesystem for each array device, to not lose any data you need all drives minus any 2 (plus one cache device for cache data assuming it's raid1).

You would have to take all of them except for 2 in order to guarantee no loss of data

Sent from my NSA monitored device

3 minutes ago, johnnie.black said:

Any data drive you take can be read completely, since Unraid uses an independent filesystem for each array device, to not lose any data you need all drives minus any 2 (plus one cache device for cache data assuming it's raid1).

So, is that any hard drive minus two (including parity drives) or just the data drives and one cache drive?

1 minute ago, HH0718 said:

is that any hard drive minus two (including parity drives)

this for the array data and one cache device if there's needed data there.

You'd need 10 data 2 parity and your cache drive (assuming its raid 1) to not lose any data. If you lost your parity you would only lose the data from and missing data drives.

 

eg no party and 9 data and a cache means you lose the data that is on the missing data drives.

 

Hope this helps you.

Thank you all for your responses.