I've had what may be the same problem for years, with a USB3 disk, on both
10-stable and 12.0-release. I've never found a cause, though power gitches
might be responsible. As a pragmatic fix I have the backup disk as a zpool and
run a daemon that simply does a zpool clear if it finds the pool unhealthy
during the backup. That lets the backup complete every time - the pool is set to
wait on error, so having the daemon check once a minute works with minuscule
overhead.
On Fri, Jan 11, 2019 at 11:31:55PM -0800, Kevin Oberman
wrote:> Que Twilight Zone theme. For your consideration: This started in December
> when I was running 11.2-STABLE. Starting in December, when I try to backup
> my laptop to a USB drive, it periodically dropped off-line (disconnected)
> and immediately reconnected. This was originally using rsync. It seemed
> fairly random and, eventually I got a successful backup. After I upgraded
> to 12.0, it was much worse and I could no longer get a clean rsync.
>
> I assumed that the drive was failing and swapped it for an identical one,
> re-partitioned, and used dd to copy each partition. The same thing
> happened, but I noticed that it seemed to happen when the system was a bit
> active. I then shutdown X and tried with nothing else running. It ran for a
> few minutes until I did a sync from a different login while the dd was
> running. Boom. Disk disconnected again.
>
> I finally got an almost complete backup of /usr. I had about 1-2 GB lest
> when it happened again. I suspect that some background operation (periodic
> sync?) triggered it again.
>
> Any suggestions?
>
> Here is my system info: Lenovo T520 now running FreeBSD 12.0-STABLE r342788
> and GENERIC config except SCHED_4BSD. System is completely stable except
> for the USB disk dropping off-line. Disk is a 2TB WD My Passport. It is a
> USB 3.0 drive,but plugged intoa 2.0 port. (The T520 has no 3.0 capability.
>
> Has anyone seen anything like this? Any ideas? I am REALLY nervous running
> without a backup.
> --
> Kevin Oberman, Part time kid herder and retired Network Engineer
> E-mail: rkoberman at gmail.com
> PGP Fingerprint: D03FB98AFA78E3B78C1694B318AB39EF1B055683
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We shall overwhelm.