MilkSomelier Posted March 28, 2022 Share Posted March 28, 2022 I know probably someone already have done that , so my take is a copy of the existing parity drive but in a remote location . Is there anny way? Quote Link to comment
itimpi Posted March 28, 2022 Share Posted March 28, 2022 What are you trying to achieve? I cannot see why you would want this? Quote Link to comment
MilkSomelier Posted March 28, 2022 Author Share Posted March 28, 2022 (edited) If phisically anything happens to the parity disk i have a copy in another location Edited March 28, 2022 by MilkSomelier Quote Link to comment
JonathanM Posted March 28, 2022 Share Posted March 28, 2022 Parity disk by itself is worthless, you must have all remaining data disks as well to rebuild a failed drive. https://wiki.unraid.net/Parity Please read. Quote Link to comment
MilkSomelier Posted March 28, 2022 Author Share Posted March 28, 2022 Sooo... there is no maner right? Quote Link to comment
JonathanM Posted March 28, 2022 Share Posted March 28, 2022 25 minutes ago, MilkSomelier said: Sooo... there is no maner right? I don't understand. Quote Link to comment
MilkSomelier Posted March 28, 2022 Author Share Posted March 28, 2022 If there is any way to have a copy of the parity disk in a remote location Quote Link to comment
ghost82 Posted March 28, 2022 Share Posted March 28, 2022 You mean a 1:1 copy of the parity disk disconnected and stored in its box somewhere? Just clone it as you can clone any disk, you can use dd command. dd if=/dev/sdX of=/dev/sdY Where X is the source drive and Y is the target drive. You can append to that command also bs= to specify block size (no option defaults to 512 bytes) Quote Link to comment
itimpi Posted March 28, 2022 Share Posted March 28, 2022 50 minutes ago, MilkSomelier said: If there is any way to have a copy of the parity disk in a remote location I do not see any benefit to this as the moment the data on any of the array disks changes then the parity disk contents will no longer be valid. As I said before what is it you are actually trying to achieve by doing this? 1 Quote Link to comment
ghost82 Posted March 28, 2022 Share Posted March 28, 2022 (edited) 9 minutes ago, itimpi said: I do not see any benefit to this as the moment the data on any of the array disks changes then the parity disk contents will no longer be valid With a lot of imagination I think he thinks to have a 1:1 backup of the parity drive in case it's the parity that fails, so to be able to swap it soon: never had a parity so I don't know if it will work to change the parity drive with another with the same content. But if it's the parity drive that fails he can rebuild from valid datas on array...anyway, if he wants to have a backup... oh and yes I see now what you mean, the moment you add a file or modify something into the array the parity backup will no longer be valid...so 100% useless Edited March 28, 2022 by ghost82 Quote Link to comment
JonathanM Posted March 28, 2022 Share Posted March 28, 2022 1 hour ago, MilkSomelier said: If there is any way to have a copy of the parity disk in a remote location As ghost82 said, yes, you can copy the disk just like any other disk. Let me rephrase the question, that I think you really are meaning to ask Quote Is there is any way to have a copy of the parity disk in a remote location that will allow me to recover a failed drive if I put it back in the server? The answer to that is NO, parity is continually synced to the rest of the data disks, and as soon as it is out of sync, ANY recovery using it will be corrupted beyond use. Parity holds no data, it only completes the set with the data disks, so when any single disk is removed, it can answer the equation formed with the rest of the data disks. It is useless without the rest of the data disks. All this is explained in the link I posted. 1 Quote Link to comment
ChatNoir Posted March 28, 2022 Share Posted March 28, 2022 If you can have a remote backup possibility, why not backup your actual valuable data instead of Parity ? 1 Quote Link to comment
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