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: rkober...@gmail.com > PGP Fingerprint: D03FB98AFA78E3B78C1694B318AB39EF1B055683 > _______________________________________________ > freebsd-stable@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-stable > To unsubscribe, send any mail to "freebsd-stable-unsubscr...@freebsd.org" -- Forcing a woman to bear a child against her will is the moral equivalent of rape. Resist. Persist. We shall overwhelm. _______________________________________________ freebsd-stable@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "freebsd-stable-unsubscr...@freebsd.org"
