> [22565.451321] usb-storage 1-1:1.0: USB Mass Storage device detected
> [22565.451467] scsi host3: usb-storage 1-1:1.0
> [22566.457236] scsi 3:0:0:0: Direct-Access ST16000N M001G-2KK103
> PQ: 0 ANSI: 5
> [22566.457527] sd 3:0:0:0: Attached scsi generic sg2 type 0
IIUC you plug your disk via USB and it uses the standard "USB Mass
Storage" (UMS) protocol.
> [22566.457823] sd 3:0:0:0: [sdb] Very big device. Trying to use READ
> CAPACITY(16).
> [22566.457997] sd 3:0:0:0: [sdb] 31251759104 512-byte logical blocks:
> (16.0 TB/14.6 TiB)
> [22566.458365] sd 3:0:0:0: [sdb] Write Protect is off
> [22566.458369] sd 3:0:0:0: [sdb] Mode Sense: 28 00 00 00
> [22566.458640] sd 3:0:0:0: [sdb] No Caching mode page found
> [22566.458644] sd 3:0:0:0: [sdb] Assuming drive cache: write through
> [22566.538074] sdb: sdb1 sdb2
> [22566.583373] sd 3:0:0:0: [sdb] Attached SCSI disk
> [22575.515358] XFS (sdb1): Mounting V5 Filesystem
> [22575.742880] XFS (sdb1): Starting recovery (logdev: internal)
> [22575.919197] XFS (sdb1): Ending recovery (logdev: internal)
> [22575.932002] xfs filesystem being mounted at
> /media/user/77d8da74-a690-481a-86d5-9beab5a8e842 supports timestamps
> until 2038 (0x7fffffff)
OK, now it read the disk just fine and mounted it.
> [22582.368977] usb 1-1: USB disconnect, device number 21
After just 7s it disconnected? Sounds like you have a connection
problem. Poor cabling? Or maybe the disk consumes more power than its
power adapter can provide? (seems unlikely since it's a 16TB drive, so
presumably spinning and those usually reach their top consumption when
spinning up, so it would have failed before mounting the filesystem, but
it's still a possibility).
> the drive has its own power cable and those kinds of failures have
> actually happened in research rooms in libraries, which are rented by
> VIPs for their own conferences ...; so, I doubt those electrical
> outlets are also failing
Te problem is probably not coming from the electrical outlet, but it
could come from the disk's power cable or power adapter.
> The laptop + external disk combination I am using right now has a
> very pore transfer rate. I need at least three times that around
> 100MB/sec:
100MB/s means more than 1Gb/s so you definitely can't reach that much
with USB2. Make sure your USB<->SATA adapter is USB3 and that you plug
the disk into a USB3 port as well. But even then you may find it
difficult to reach that speed because of the overhead introduced by USB.
36.87MB/s is quite reasonable for a USB2 connection (I'd even venture
to say it's pretty good).
Stefan
