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OS 6.6 on Ultra 6:. Not ready for prime time? Do I need more memory? Or...?
TL;DR version: OS 6.6 is worryingly unpredictable/unstable on my Ultra 6. Do I just need to expand the memory past the stock 1 GB, or is OS 6 still not ready for prime time, at least on these older b...
Final update (I hope): I re-ran the upgrade from 4.2 to 6.6.1. The NAS has been working perfectly for over a week. What was different this time? (a) all disk were in place already, so no RAID expansion was needed; and (b) I went straight to 6.6.1, not 6.6.0.
I did order more memory, but haven't installed it; I'm still running the stock 1 GB. I wanted to replicate my previous issues first so I could verify whether increasing RAM alone would fix it. But the box has resolutely failed to show any issues at all: no hangups, no unexpected slowness, no failures to respond. I've tried things like running a scrub while launching backups and hitting the NAS with clients, and the system reacted more slowly when all that was going on, but even so: it all worked, and the scrub of 8.8 TB finished within 48 hours (as did the initial full backup, before I started the stress test). Incremental backups run as quickly now as they did on OS 4.
So I either had a subtle corruption during the initial upgrade, or stuffing two new disks in and expanding the volume triggered the problems. But it wasn't low RAM, apparently, and OS 6 seems to be running fine despite my best attempts to break it. I'm going to label it "bug report closed: cannot replicate."
As for the apparent mislabeling of the System and CPU temperatures? I edited /etc/frontview/sensors/ULTRA6.conf and swapped the "System" and "CPU" labels for temp2 and temp3, ran "systemctl restart readynasd", and now the readings in the web UI match the values I expected from version 4.2 (I got the idea from this thread: <https://community.netgear.com/t5/Using-your-ReadyNAS/ReadyNAS-4200V2-OS6-6-1-fan-control/m-p/1219655#U1219655>).
Another hang, after half a day of operation: front panel display frozen, power button inoperative, can't restart or shutdown from web UI, no updates to performance graphs since about 2:50am. Yet resync continues, shares are accessible (though very slowly) and backup jobs ran, completing at 5:21am. Swap topped out at 42196 KiB. "reboot -f" restated the NAS.
If the system is swapping a lot then more RAM may help. It shouldn't crash if it's using swap but performance would drop.
On all of my 6-bay systems (which includes one Ultra 6) the temperatures have always seemed swapped to me, on 4.2.x as well as 6.x. Or at least I think they all were. The Ultra6 has only ever been a backup system, so it may have been reversed and I never noticed. They are quite similar to what you are experiencing with 6.6. Since my Ultra6 is just a backup, I booted it up 10 minutes ago to watch what happens. Drives are at 33°C to 35°C, CPU at 30°C, and system at 55°C. The system temperature started at about 43°C and rose quickly to the current temperature. I have only one 6-bay system not running 6.x. It's an Ultra6Plus. I booted it a couple minutes after the Ultra6. Note that it's not co-located, the environment may be a bit cooler, and it's got some older Seagate enterprise drives where the Ultra6 has WD reds.. The drives are 39° or 41°C, CPU at 24°C and system at 55°C. But here is the kicker -- the chart on the U;ltra6 OS6.6.0 system and the reported current temperature don't agree. The chart says the CPU temp stared at 0°C and is now at 27°C. The reported current CPU temperature has not moved from the original 30°C.
30°C may be a valid CPU temp at the point it took the first measurement. 0° clearly is not, nor is 27°C likely. And it's not that there is a single bad reading at 0° and it jumps to something valid -- it has been slowly rising. There is definately something amiss with the reporting of Ultra6 CPU temperature in OS6.6.0. The reported current temperature stays fixed at the boot temperature and the charted temperature has the wrong scale factor and bias. Yes, it's "unsupported", but I thought they had this right at some point.
Could I interject for a moment and ask a dumb question? where is the sensor or what does the "System" temp represent
I have a Pro 4 on OS 6.6.1
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