On Sun, Feb 6, 2022 at 8:15 PM Sean Bruno <sbr...@freebsd.org> wrote:
> I'm doing something "gross" with ZFS & Plex on a little Intel NUC that I > have here at the house to provide me with a nice little NAS at home. > I'm using 2x USB2 external disks as the mirror. > > I noted that the two USB2 disks I'm using in a mirror seem to "stall" > from time to time and its not clear to me why. > > I'd like to poke further into the USB system but I'm not sure where I > should start to see if there is something amiss with the hardware (e.g. > the disks suck) or if FreeBSD is losing track of something during I/O > leading to a stall/timeout. > > I'm not seeing data loss or anything, I just note from time to time > during large file transfers that the clanking/grinding sound of the > spinning rust on my desk completely stops, the encoding of the video > files stops (so its waiting for a read to complete) and its gets much > quieter in my office. :-) > > sean > > I encountered such a case in Fedora Linux with an external 2.0 USB disk . When the external disk was connected to a 1.? USB port , the loading of operating system was terrifically slow or sometimes some parts normal . You may check your USB ports versions to ensure that they are conforming to each other . Board USB port may be 2.0 , but connected chassis USB port may be 1.? like in my chassis . When USB external disk is connected to the chassis USB 2.0 port , everything has become normal . Mehmet Erol Sanliturk
