• https://www.synology.com/releaseNote/DS112+

The CPU usage (and also some recurring disk usage) had been that high for quite a couple of months on one of my DiskStations (a DS112+), and esp. the disk usage (preventing the disk from hibernating) had worried me quite a lot. The problem started with a prior firmware update, and I was unable to fix it.

But when I read today in the release notes for their “5.2-5565 Update 2”, it suddenly struck me. Maybe I should have tried to close their DSM sysload widget, once when the problem arose, but sadly enough that idea did not come up.

Fixed Issues:

• …
• Fixed an issue where CPU usage could remain high when widget is enabled.
• …

How did I discover the high CPU usage in the first place? GKrellM … – I wrote about that before, and you can simply select that category here around the article.

Thanks, Synology, for stealing a couple of thousands of hours of lifetime from that NAS disk!

Today when I rsync-ed my Mac’s disk to my Synology NAS-s, I found a couple of lines like this one:

WARNING: abc.csv failed verification -- update discarded (will try again).

file has vanished: "def.csv"
IO error encountered -- skipping file deletion

Of course this worries me. I stopped the script, that starts the rsync-s. I ran it again. The warnings did not show up again. I searched the web for this warning message, and I decided to check the disks’ health of the (mirroring) disks on the NAS and the Mac in question.

On the Mac: Applications > Utilities > Disk Utility – I selected the entire disk, selected First Aid and then Verify Disk. Everything appears fine.

On the Synology NAS: Storage Manager > HDD/SDD > Health Info – I scheduled a weekly “extended S.M.A.R.T. Test”.

All my Synology NAS-s create a “Monthly Health Report” anyway, being delivered via e-mail.