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Forum Discussion
ATA Errors Not In System Log
Thought I'd comment on a curiosity that arose from a weird situation where a 516 spent 10+ hours syncing a drive replacing a missing member of a RAID6 array. But upon finishing it simply faulted it again. I'd logged in fresh to the web UI, and nothing I saw gave a quick clue as to WHY it'd failed the drive again.
Upon reseating the drive, the issue became more apparent... quickly there were a ton of warnings in the web UI about I/O errors to the disk. ATA error count over 3000 -- for a drive that had heretofor been under 50. So clearly an issue. But when I went looking at the system log there was ZERO mention of these alerts. And since this NAS is prepped to be on someone else's home LAN, it's email alerts aren't going out (until he connects it in it's proper home). So that would have been another vector for being advised of the issue, for sure.
I do keep wondering though why such alerts aren't logged into the system log though... I think that would be quite helpful in situations where someone is diagnosing problems and tries to isolate faults without the benefit of a live web session or copies of email alerts.
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The status log will record things when there has been a very significant amount of change.
The smart_history.log contains every change to key SMART values for every disk in the NAS.So it was the new disk that you added that had ATA errors?
Well, according to the smart_history.log:
2016-12-29 02:01:14 ST4000DM000-1F2168 W300ADXP 0 0 0 0 0 9168 9168 0 2016-12-29 15:22:26 ST4000DM000-1F2168 W300ADXP 0 0 0 0 1 3312 3312 0 2016-12-29 16:35:21 ST4000DM000-1F2168 W300ADH6 0 0 0 0 1 0 0 12
I don't know what others might think, but I think 3000+ or 9000+ uncorrectable errors is probably a fair bet for having listed in the regular log display as "significant". ;) This was actually a drive that was previously in use in the 516 and later replaced with an 8TB disk in a newer deployment. But it certainly wasn't experiencing this sort of failure rate until very recently. Clearly, it is in bad shape and requires retirement.
What strikes me as odd is that I'd see all kinds of pop-up displays in the web UI /while/ these errors were building, and perhaps even get email notifications for them, but they don't apepar in the "Logs" display in the web UI? That's the head scratcher. Maybe there's a reason for it, but it seems like it'd be making difficult to see something really should be visible... if for no other reason than to allow someone to log in and see what's been going on at a glance if they get email notifications, and to corroborate the events without needing to download the logs .zip file.
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