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4 disk RAID 10 array....how do I tell which disks are striped?
I'm trying to figure out which disks are paired together as I'm moving data to another system and am going to canabalize the array for now. Everything is backed up so if something happens I'll be...
jlficken wrote:Number Major Minor RaidDevice State 0 8 3 0 active sync set-A /dev/sda3 - 0 0 1 removed 2 8 35 2 active sync set-A /dev/sdc3 3 8 51 3 active sync set-B /dev/sdd3Would it seem logical that I can remove either disk 0 or disk 2 safely?
Yes, that is the case. It looks like you already removed disk sdb (bay 2) - which was mirrored by sdd (bay 4).
Thanks!!!
I see this in that file:
Consistency Policy : unknown
Name : 7c6e3906:MAIN-0 (local to host 7c6e3906)
UUID : fd0716df:099c5648:d351a440:b82e32f5
Events : 13588
Number Major Minor RaidDevice State
0 8 3 0 active sync set-A /dev/sda3
- 0 0 1 removed
2 8 35 2 active sync set-A /dev/sdc3
3 8 51 3 active sync set-B /dev/sdd3Would it seem logical that I can remove either disk 0 or disk 2 safely?
jlficken wrote:Number Major Minor RaidDevice State 0 8 3 0 active sync set-A /dev/sda3 - 0 0 1 removed 2 8 35 2 active sync set-A /dev/sdc3 3 8 51 3 active sync set-B /dev/sdd3Would it seem logical that I can remove either disk 0 or disk 2 safely?
Yes, that is the case. It looks like you already removed disk sdb (bay 2) - which was mirrored by sdd (bay 4).
That is correct.
I knew I could remove 1 of the 4 drives without any issues (besides the array being "Degraded"), however, I wasn't sure how to know which drive to remove next so I came here.
They are all HGST HE8 UltraStar drives and I have a complete backup on another ReadyNAS so I'm not too concerned about running it degraded for a little bit while I am finishing the new NAS. The data from this volume will be moved over yet this morning via rysnc and then I can move on to the next volume.
Thanks again!
jlficken wrote:
I knew I could remove 1 of the 4 drives without any issues (besides the array being "Degraded"), however, I wasn't sure how to know which drive to remove next so I came here.
I'm glad I could help.
JohnCM_S: There is nothing about this for any of the more advanced RAID modes in the manuals. It'd be good if that were added (and a kb article on how to determine the RAID structure for RAID-10, 50, and 60 from mdstat.log would be really helpful). Is that something you can request?
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