On Wed, 3 Jul 2024 09:42:53 +0200 Mariusz Tkaczyk <mariusz.tkaczyk@xxxxxxxxxxxxxxx> wrote: I was able to achieve similar state: mdadm -E /dev/nvme2n1 /dev/nvme2n1: Magic : a92b4efc Version : 1.2 Feature Map : 0x0 Array UUID : 8fd2cf1a:65a58b8d:0c9a9e2e:4684fb88 Name : gklab-localhost:my_r6 (local to host gklab-localhost) Creation Time : Wed Jul 3 09:43:32 2024 Raid Level : raid6 Raid Devices : 4 Avail Dev Size : 1953260976 sectors (931.39 GiB 1000.07 GB) Array Size : 10485760 KiB (10.00 GiB 10.74 GB) Used Dev Size : 10485760 sectors (5.00 GiB 5.37 GB) Data Offset : 264192 sectors Super Offset : 8 sectors Unused Space : before=264112 sectors, after=1942775216 sectors State : clean Device UUID : b26bef3c:51813f3f:e0f1a194:c96c4367 Update Time : Wed Jul 3 11:49:34 2024 Bad Block Log : 512 entries available at offset 16 sectors Checksum : a96eaa64 - correct Events : 6 Layout : left-symmetric Chunk Size : 512K Device Role : Active device 2 Array State : ..A. ('A' == active, '.' == missing, 'R' == replacing) In my case, events value was different and /dev/nvme3n1 had different Array State: Device Role : Active device 3 Array State : ..AA ('A' == active, '.' == missing, 'R' == replacing)
This kind of array behavior is like it should be?
Why I'm asking, in theory.
We have bitmap so when third drive disconnect from the array we
should have time to stop the array in foulty state before bitmap
space is over, yes?.
Next array send notification to FS(filesystem) that there is a
problem and will discard all write operation.
Data that can't be store on the foulty device should be keep in
the bitmap.
Next when we reatach missing third drive when we write missing
data from bitmap to disk everything should be good, yes?
I'm thinking correctly?
And I failed to start it, sorry. It is possible but it requires to work with sysfs and ioctls directly so much safer is to recreate an array with --assume-clean, especially that it is fresh array.
I recreated the array, LVM detected PV and works fine but XFS above the LVM is missing data from recreate array.
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