RN102 broken after OS 6.10.4 update

What does your initrd.log look like in the logs zip? That will show the firmware update history since the last factory reset of your system.

BTRFS has always been used as the filesystem for the data volume for OS6 and the filesystem for the root volume on the x86 NAS units (the 102 uses EXT4 for the root volume).

Bit-rot protection was added back in 6.2.x

If you ever used bit-rot protection or snapshots, disabling bit-rot protection isn't going to undo all the CoW that has happened. It will just limit what happens going forward.

There are things you could check like CPU usage, whether the memory is using a lot of swap etc. Also turn off services and apps that you don't need.

Over time as updates are released software may consume more resources and the RN100 series is the least powerful systems that run OS6 so any performance hit is going to be most noticeable on those systems.

If you have a bad disk that can impact performance. If you only have the one disk that can also impact performance, and if your NAS is doing a resync of the RAID whilst adding a replacement disk performance will be reduced until that resync completes.

IMO you should be careful to tackle one issue at a time.  So wait to address the speed issue until you have a full RAID-1 volume back.

I also suggest making a backup of your files before you add the replacement disk back.  The rebuild of the RAID will stress the disk 2 (every sector is read and copied to the replacement to create the mirror).  If the disk 2 fails during the process, you will lose your data.

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dstsui wrote:
When was BTRFS introduced?

 

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Your NAS has always used BTRFS.

My own RN102 goes back to 2013.  By 2016 the read speed had dropped to about 35 MB/sec.  This was using jbod volumes (so bitrot protection was off, since it needs RAID redundancy).  That speed sounds very similar to yours.

A factory reset restored the read speed to around 70 MB/s.  I posted the results here, but it was a long time ago, and search isn't finding them. I did another benchmark in 2019, checking all three versions of SMB.  The second test was using different disks, and the NAS was set up for XRAID/RAID-1 - not jbod.  SMB 2.1 speeds were still around 70 MB/s, though SMB 3 was somewhat slower (63 MB/sec).   https://community.netgear.com/t5/Using-your-ReadyNAS-in-Business/Average-transfer-speed-read-and-write-plummeted-after-replacing/m-p/1718589#M178329

So based on my own experience, a factory reset will almost certainly increase your speeds substantially.  Yes, it is painful, but the performance increase is likely worth it.

Other things you can try:

• Disable strict sync in the SMB settings
• disable IPv6 in your NAS network settings.  In some cases the PC will use ipv6 link local addresses for data transfer, and that can be slower (esp if your router doesn't have ipv6 enabled).
• Disabling all services you don't actually need (and uninstalling any apps you no longer use).  The RN102 doesn't have much memory, and over the years the memory footprint of the firmware has increased.  Removing services and apps can help mitigate that.
• Run the maintenance functions on the volume settings wheel.  Balance and Scrub can both help improve performance.  Personally I schedule one maintenance function per month  - completing the cycle every four months (balance, defrag, scrub, disk test)

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StephenB wrote:

IMO you should be careful to tackle one issue at a time.  So wait to address the speed issue until you have a full RAID-1 volume back.

 

I also suggest making a backup of your files before you add the replacement disk back.  The rebuild of the RAID will stress the disk 2 (every sector is read and copied to the replacement to create the mirror).  If the disk 2 fails during the process, you will lose your data.

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I already made a backup and it is now going through the array rebuild process. Fingers crossed.

Will certainly try your other suggestions. Not sure I have the appetite to start from scatch and resintall the OS, too much work. If I can get to to say 50MB/s write and 40MB/s read I will be happy.

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dstsui wrote:
Not sure I have the appetite to start from scatch and resintall the OS, too much work. If I can get to to say 50MB/s write and 40MB/s read I will be happy

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FWIW, I did it fairly recently on my RN202 (not for performance reasons).  I had about 12 TB of data to reload. 

The factory reset itself doesn't take that much of your time unless you have a lot of apps you need to track down and reinstall. Reloading data takes more time, but you really don't have that much.   The main issue for me is that the NAS isn't available until the process completes.  Though the RN202 is exclusively for back up, it's not my main NAS.