On 2/6/22 10:52, Mehmet Erol Sanliturk wrote:
On Sun, Feb 6, 2022 at 8:15 PM Sean Bruno <sbr...@freebsd.org
<mailto: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
I see them all up as 480mbps / USB 2.0 if usbconfig and the driver
attach is anything to go by. Disk read/write perf when running seems to
approach 40MB/s, so I think its running pretty close to the correct speed.
...
ugen0.7: <DMI MZF> at usbus0
umass1 on uhub0
umass1: <DMI MZF, class 0/0, rev 2.00/2.69, addr 6> on usbus0
da0 at umass-sim1 bus 1 scbus4 target 0 lun 0
da0: <DMI MZF 2.69> Fixed Direct Access SCSI device
da0: 40.000MB/s transfers
da0: 1907729MB (3907029168 512 byte sectors)
da0: quirks=0x2<NO_6_BYTE>
Root mount waiting for: usbus0
....
ugen0.8: <Iomega HDD Iomega HDD> at usbus0
umass2 on uhub0
umass2: <Interface0> on usbus0
da1 at umass-sim2 bus 2 scbus5 target 0 lun 0
da1: <External RAID 0> Fixed Direct Access SPC-2 SCSI device
da1: Serial Number ABCDEF0123456847
da1: 40.000MB/s transfers
da1: 1907729MB (3907029168 512 byte sectors)
da1: quirks=0x2<NO_6_BYTE>
...
ugen0.7: <DMI MZF> at usbus0, cfg=0 md=HOST spd=HIGH (480Mbps) pwr=ON (2mA)
ugen0.8: <Iomega HDD Iomega HDD> at usbus0, cfg=0 md=HOST spd=HIGH
(480Mbps) pwr=ON (500mA)
...
sean
