Opawesome Posted November 26, 2020 Share Posted November 26, 2020 (edited) Hi all, This question may have been answered already and If so I apologise. If I move disks 5-8 to slots 9-12 (both physically and in the array configuration), will it invalidate my parity (I have 2 parity drives) ? A picture of my array configuration is attached. I could not find the answer in https://wiki.unraid.net/UnRAID_6/Storage_Management or in the forums. Ultimately, I would like to insert 4 additional drives in slots 5-8. Many thanks for your help. Best OP Edited November 27, 2020 by Opawesome Marked as "(SOLVED)" Quote Link to comment
trurl Posted November 26, 2020 Share Posted November 26, 2020 It will invalidate parity2 1 Quote Link to comment
Opawesome Posted November 26, 2020 Author Share Posted November 26, 2020 1 minute ago, trurl said: It will invalidate parity2 Hi trurl, Many thanks for your answer. I appreciate it. So I understand that: parity1 will remain valid party2 will become invalid, although all drives would remain in the same order. Can you please confirm whether my understanding is correct? Many thanks. Best regards, OP Quote Link to comment
itimpi Posted November 26, 2020 Share Posted November 26, 2020 7 hours ago, Opawesome said: Hi trurl, Many thanks for your answer. I appreciate it. So I understand that: parity1 will remain valid party2 will become invalid, although all drives would remain in the same order. Can you please confirm whether my understanding is correct? Many thanks. Best regards, OP Yes, the calculations for parity2 includes the drive slot number as one of the input variables while that for parity1 does not. 1 Quote Link to comment
Opawesome Posted November 26, 2020 Author Share Posted November 26, 2020 21 minutes ago, itimpi said: Yes, the calculations for parity2 includes the drive order information as one of the input variables Hi itimpi, Thank you very much. I am indeed well aware of this. This is why I asked if party2 will become invalid, although all drives would remain in the same order. Is moving disks 5-8 to slots 9-12 (both physically and in the array configuration) considered a "change in the order of the drives" ? Many thanks. Best, OP Quote Link to comment
JonathanM Posted November 27, 2020 Share Posted November 27, 2020 1 hour ago, Opawesome said: Is moving disks 5-8 to slots 9-12 (both physically and in the array configuration) considered a "change in the order of the drives" ? Physical configuration doesn't matter, but slot assignment is how drive order is determined. Slot 5 is not equal to slot 9. Just because you move a whole block of drives, it's still a different order because slot 5 doesn't contain the same bits as it did before you reassigned it. 1 Quote Link to comment
DougCube Posted November 27, 2020 Share Posted November 27, 2020 (edited) 7 hours ago, Opawesome said: Ultimately, I would like to insert 4 additional drives in slots 5-8. The way the OP is worded makes me want to clarify that you can't have gaps in your array slot assignments. And yes, what you describe is considered "reordering" from the UnraidOS point of view (especially w.r.t. the parity2 calculation). And like others have said, the physical configuration doesn't matter at all -- you can change where a drive is physically mounted or which SATA/SAS cables/ports to use between boots and the OS will easily cope with it. (Although I wouldn't switch an array drive from being internally mounted to being in an external USB enclosure.) I used to be overly concerned with the ordering of the drives, but I eventually found that it's best to live with leaving the order alone. Although... I have requested a feature to be able to assign nicknames to the drives to make it easier to manage. But if you do choose to reorder, keep in mind that the 'included/excluded' drive selections in the shares do not automatically update to track the change -- you'll have to update those manually. Edited November 27, 2020 by DougCube strike out incorrect info 1 Quote Link to comment
itimpi Posted November 27, 2020 Share Posted November 27, 2020 17 minutes ago, DougCube said: The way the OP is worded makes me want to clarify that you can't have gaps in your array slot assignments. Not true. You can have as many gaps as you want. Most people prefer not to have gaps but,Unraid does not enforce this. 1 Quote Link to comment
DougCube Posted November 27, 2020 Share Posted November 27, 2020 21 minutes ago, itimpi said: Not true. You can have as many gaps as you want. Most people prefer not to have gaps but,Unraid does not enforce this. Oh, good to know. I struck-out the incorrect info from my reply. Thanks. I might actually use this 'feature' going forward then. I just have a slight preference to group up drives of the same capacity and manufacturer. 1 Quote Link to comment
Opawesome Posted November 27, 2020 Author Share Posted November 27, 2020 Dear jonathanm, itimpi and DougCube, Thank you very much for taking the time to explain and give advice. I think I will let it rest for a day or two and we will see then who wins between my OCD (desire to have the drives well sorted out) and my fear of having to rebuild parity2 Best regards, OP Quote Link to comment
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.