Hello,
I have a RAID1 with 2 LVM disks and I am running into a strange
situation where having the 2 disks connected to the array the bitmap
never clears the dirty chunks.
I am assuming also that when a RAID1 is in write-through mode, the
bitmap indicates that all the data has made it to all the disks if
there are no dirty chunks using mdadm --examine-bitmap.
The output of cat /proc/mdstat is:
md2060 : active raid1 dm-5[1] dm-6[0]
2252736 blocks [2/2] [UU]
bitmap: 1/275 pages [12KB], 4KB chunk, file: /tmp/md2060bm
The output of mdadm --examine-bitmap /tmp/md2060bm is:
Filename : md2060bm
Magic : 6d746962
Version : 4
UUID : ad5fb74c:bb1c654a:087b2595:8a5d04a9
Events : 12
Events Cleared : 12
State : OK
Chunksize : 4 KB
Daemon : 5s flush period
Write Mode : Normal
Sync Size : 2252736 (2.15 GiB 2.31 GB)
Bitmap : 563184 bits (chunks), 3 dirty (0.0%)
Having the array under no IO, I waited 30 minutes but the dirty data
never gets clear from the bitmap, so I presume the disks are not in
sync; but after I ran a block by block comparison of the two devices I
found that they are equal.
The superblocks and the external bitmap tell me that all the events
are cleared, so I am confused on why the bitmap never goes to 0 dirty
chunks.
How can I tell if the disks are in sync?
Thank you in advance for any help.
--
Juan Aristizabal
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