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To speed up the rebuild of a RAI volume, I usually stop/disable as many applications and services (including network sharing) as I can, and I do not access the QNAP through the webUI - just to save resources. This really makes a huge differences, especially when you give the rebuild the highest priority (Resync First).
Now the challenge is how to monitor progress.
First thing I did is adding a rule to the Notification Center, so I get a notification when a rebuild was completed.
But I'm antsy at times and really want to know how far we are with the rebuild.
With SSH you can execute this to see your progress ...
cat /proc/mdstat
You'll see something like this (I removed the less relevant info), where it shows we're at 38.5%:
...
md2 : active raid6 sdj3[9] sdi3[13] sdd3[12] sdc3[10] sde3[11] sdf3[8] sdh3[0] sdg3[1]
23382380544 blocks super 1.0 level 6, 512k chunk, algorithm 2 [8/7] [UU_UUUUU]
[=======>.............] recovery = 38.5% (1502218752/3897063424) finish=733.2min speed=54433K/sec
bitmap: 5/30 pages [20KB], 65536KB chunk
...
Hope this is helpful to anyone 😁
If you're impatient, like me, then you can run this, which
- opens an ssh connection,
- executes cat /proc/mdstat | grep recovery,
- and closes the SSH connection (exit).
ssh username@ip-of-your-qnap 'cat /proc/mdstat | grep recovery; exit'
So for example:
~ $ ssh admin@192.168.1.100 'cat /proc/mdstat | grep recovery; exit'
[===========>.........] recovery = 55.0% (2144721408/3897063424) finish=320.5min speed=91109K/sec
~ $
(all this under the assumption that you have SSH to your QNAP setup to login with an SSH Key - so no password is needed)
Same trick can be applied when looking for the status of a resync when you expand a pool:
ssh admin@192.168.1.100 'cat /proc/mdstat | grep resync; exit'
I can see the rebuild status as below. What does this mean?
md13 : active raid1 sdg4[129] nvme0n1p4[0] sda4[128] sdc4[3] sdb4[2] nvme1n1p4[1]
458880 blocks super 1.0 [128/6] [UUUUUU__________________________________________________________________________________________________________________________]
bitmap: 1/1 pages [4KB], 65536KB chunk
md9 : active raid1 sdg1[129] nvme0n1p1[0] sda1[128] sdc1[3] sdb1[2] nvme1n1p1[1]
530048 blocks super 1.0 [128/6] [UUUUUU__________________________________________________________________________________________________________________________]
bitmap: 1/1 pages [4KB], 65536KB chunk
Apologies for the late reply (I'm on vacation).
So what I can see (and I'm not an expert):
6 drives are being used (U) and functional. Any "_" is said to represent a missing or defective drive. Most likely in your case these are drive slots that are not being used.
For the rest I can only guess that you have 2 RAID-1 arrays (md9 and md13).
Is this what you're looking for?
@hans for me I'm seeing the same thing. QNap frontend has "rebuilding" but /proc/mdstat doesn't have a "recovery" line.
Trying to see progress but not seeing progress in that command.