Hi! Thanks for the pointers. Unfortunately dmesg and system logs where the first places I looked at, but I found nothing at the time. I tried it again now to give you the output of a zpool clear, you can obviously ignore the failed email attempt. journalctl:
Jun 07 08:06:24 truenas kernel: WARNING: Pool 'tank-02' has encountered an uncorrectable I/O failure and has been suspended.
Jun 07 08:06:24 truenas zed[799040]: eid=309 class=statechange pool='tank-02' vdev=xxx-xxx-xxx-xxx-xxx vdev_state=ONLINE
Jun 07 08:06:24 truenas zed[799049]: eid=310 class=statechange pool='tank-02' vdev=xxx-xxx-xxx-xxx-xxx vdev_state=FAULTED
Jun 07 08:06:24 truenas zed[799057]: eid=313 class=data pool='tank-02' priority=3 err=28 flags=0x20004000 bookmark=0:0:0:1
Jun 07 08:06:24 truenas zed[799058]: eid=311 class=vdev_clear pool='tank-02' vdev=xxx-xxx-xxx-xxx-xxx vdev_state=FAULTED
Jun 07 08:06:24 truenas zed[799067]: eid=312 class=data pool='tank-02' priority=3 err=28 flags=0x20004000 bookmark=0:62:0:0
Jun 07 08:06:24 truenas zed[799081]: eid=316 class=io_failure pool='tank-02'
Jun 07 08:06:24 truenas zed[799082]: eid=315 class=data pool='tank-02' priority=3 err=28 flags=0x20004000 bookmark=0:0:-1:0
Jun 07 08:06:24 truenas zed[799090]: eid=314 class=data pool='tank-02' priority=3 err=28 flags=0x20004000 bookmark=0:0:1:0
Jun 07 08:06:24 truenas find_alias_for_smtplib.py[799114]: sending mail to
To: root
Subject: ZFS device fault for pool tank-02 on truenas
MIME-Version: 1.0
Content-Type: text/plain; charset="ANSI_X3.4-1968"
Content-
Jun 07 08:06:24 truenas find_alias_for_smtplib.py[799114]: No aliases found to send email to root
Jun 07 08:06:24 truenas zed[799144]: error: statechange-notify.sh: eid=310: mail exit=1
dmesg says even less.
I also tried to reboot the machine with the drive detached and then attach it at runtime while tailing dmesg and journalctl. Now, they are pretty verbose, so will only add here any interesting part (I didn't notice anything new however):
[...]
[ 221.952569] usb 2-4: Enable of device-initiated U1 failed.
[ 221.954164] usb 2-4: Enable of device-initiated U2 failed.
[ 221.965756] usbcore: registered new interface driver usb-storage
[ 221.983528] usb 2-4: Enable of device-initiated U1 failed.
[ 221.983997] usb 2-4: Enable of device-initiated U2 failed.
[ 221.987603] scsi host2: uas
[ 221.987831] usbcore: registered new interface driver uas
[...]
[ 222.040564] sd 2:0:0:0: Attached scsi generic sg1 type 0
[ 222.049860] sd 2:0:0:0: [sdb] 1953525168 512-byte logical blocks: (1.00 TB/932 GiB)
[ 222.051867] sd 2:0:0:0: [sdb] Write Protect is off
[ 222.051879] sd 2:0:0:0: [sdb] Mode Sense: 37 00 00 08
[ 222.056719] sd 2:0:0:0: [sdb] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[ 222.058407] sd 2:0:0:0: [sdb] Preferred minimum I/O size 512 bytes
[ 222.058413] sd 2:0:0:0: [sdb] Optimal transfer size 33553920 bytes
[ 222.252607] sdb: sdb1
[ 222.253015] sd 2:0:0:0: [sdb] Attached SCSI disk
[ 234.935926] usb 2-4: USB disconnect, device number 2
[ 234.983962] sd 2:0:0:0: [sdb] Synchronizing SCSI cache
[ 235.227936] sd 2:0:0:0: [sdb] Synchronize Cache(10) failed: Result: hostbyte=DID_ERROR driverbyte=DRIVER_OK
[...]
Thanks for the advices, it was worth another try.
Anything more that comes to mind?