Hi I have tried it, but it does not work: [ 39.230095] sd 0:0:0:0: [sda] Very big device. Trying to use READ CAPACITY(16). [ 39.338032] sd 0:0:0:1: [sdb] Very big device. Trying to use READ CAPACITY(16). [ 39.618268] sd 0:0:0:2: [sdc] Very big device. Trying to use READ CAPACITY(16). [ 39.762801] sd 0:0:0:3: [sdd] Very big device. Trying to use READ CAPACITY(16). [ 39.901059] sd 0:0:0:4: [sde] Very big device. Trying to use READ CAPACITY(16). [ 348.134002] sd 0:0:0:0: [sda] Very big device. Trying to use READ CAPACITY(16). [ 348.231327] sd 0:0:0:1: [sdb] Very big device. Trying to use READ CAPACITY(16). [ 348.353151] sd 0:0:0:2: [sdc] Very big device. Trying to use READ CAPACITY(16). [ 348.549558] sd 0:0:0:3: [sdd] Very big device. Trying to use READ CAPACITY(16). [ 348.722858] sd 0:0:0:4: [sde] Very big device. Trying to use READ CAPACITY(16). [ 657.963478] sd 0:0:0:0: [sda] Very big device. Trying to use READ CAPACITY(16). [ 658.090253] sd 0:0:0:1: [sdb] Very big device. Trying to use READ CAPACITY(16). [ 658.291130] sd 0:0:0:2: [sdc] Very big device. Trying to use READ CAPACITY(16). [ 658.524039] sd 0:0:0:3: [sdd] Very big device. Trying to use READ CAPACITY(16). [ 658.840440] sd 0:0:0:4: [sde] Very big device. Trying to use READ CAPACITY(16). smartd details (before I had the ver 6.5 of 2016) menion@Menionubuntu:/lib/firmware/brcm$ smartd --version smartd 6.7 (build date Mar 8 2018) [x86_64-linux-4.15.5-041505-generic] (local build) Copyright (C) 2002-18, Bruce Allen, Christian Franke, www.smartmontools.org smartd comes with ABSOLUTELY NO WARRANTY. This is free software, and you are welcome to redistribute it under the terms of the GNU General Public License; either version 2, or (at your option) any later version. See http://www.gnu.org for further details. smartmontools release 6.7 dated 2017-11-05 at 15:20:58 UTC smartmontools SVN rev is unknown smartmontools build host: x86_64-pc-linux-gnu smartmontools build with: C++98, GCC 5.4.0 20160609 smartmontools configure arguments: '--prefix=/usr' '--build=x86_64-linux-gnu' '--host=x86_64-linux-gnu' '--sysconfdir=/etc' '--mandir=/usr/share/man' '--with-initscriptdir=no' '--docdir=/usr/share/doc/smartmontools' '--with-savestates=/var/lib/smartmontools/smartd.' '--with-attributelog=/var/lib/smartmontools/attrlog.' '--with-exampledir=/usr/share/doc/smartmontools/examples/' '--with-drivedbdir=/var/lib/smartmontools/drivedb' '--with-systemdsystemunitdir=/lib/systemd/system' '--with-smartdscriptdir=/usr/share/smartmontools' '--with-smartdplugindir=/etc/smartmontools/smartd_warning.d' '--with-systemdenvfile=/etc/default/smartmontools' '--with-selinux' 'build_alias=x86_64-linux-gnu' 'host_alias=x86_64-linux-gnu' 'CXXFLAGS=-g -O2 -fPIC -fstack-protector-strong -Wformat -Werror=format-security -fsigned-char -Wall -O2' 'LDFLAGS=-Wl,-Bsymbolic-functions -fPIC -Wl,-z,relro -Wl,-z,now' 'CPPFLAGS=-Wdate-time -D_FORTIFY_SOURCE=2' 'CFLAGS=-g -O2 -fPIC -fstack-protector-strong -Wformat -Werror=format-security -fsigned-char -Wall -O2' to make sure that I picked and compiled the correct code I have checked the new set_rcap16_first method and it is here: menion@Menionubuntu:~/smartmontools$ cat scsicmds.cpp |grep set_rcap device->set_rcap16_first(); menion@Menionubuntu:~/smartmontools$ I have dome doubts about your code: if (avoid_rcap16) { res = scsiReadCapacity10(device, &last_lba, &lb_size); if (res) { if (scsi_debugmode) pout("%s: READ CAPACITY(10) failed, res=%d\n", __func__, res); try_16 = true; } else { /* rcap10 succeeded */ if (0xffffffff == last_lba) { /* so number of blocks needs > 32 bits to represent */ try_16 = true; device->set_rcap16_first(); } else { ret_val = last_lba + 1; if (srrp) { memset(srrp, 0, sizeof(*srrp)); srrp->num_lblocks = ret_val; srrp->lb_size = lb_size; } } } } from the scsi kernel code I see that also read_capacity_10 return capacity in 64bit variable sector_size = read_capacity_10(sdkp, sdp, buffer); if (sector_size == -EOVERFLOW) goto got_data; if (sector_size < 0) return; if ((sizeof(sdkp->capacity) > 4) && (sdkp->capacity > 0xffffffffULL)) { so is this if statement correct? } else { /* rcap10 succeeded */ if (0xffffffff == last_lba) { I means, the last_lba is read from the responde of read_capacity_10 in scsiReadCapacity10 via this conversion: if (last_lbap) *last_lbap = get_unaligned_be32(resp + 0); so are you sure that if the device return more than about 4TB the value of this variable will be 0xFFFFFFFFUL? Yes, I can make some test myself but today I have so little time to experiment, so I have reported it to you I am sure that you will sort out quickly if this is the problem or not Bye 2018-03-07 18:14 GMT+01:00 Douglas Gilbert <dgilbert@xxxxxxxxxxxx>: > On 2018-03-07 09:02 AM, Menion wrote: >> >> 2018-03-07 14:51 GMT+01:00 Steffen Maier <maier@xxxxxxxxxxxxxxxxxx>: >>> >>> >>> On 03/07/2018 09:24 AM, Menion wrote: >>>> >>>> >>> ... >>> >>> but from then on, you only get it roughly once every 300 seconds, i.e. 5 >>> minutes >>> >>> that's where I suspect user space as trigger, unless there is a kernel >>> feature I'm not aware of doing such sdev rescans >>> >>> preventing this would be a workaround >>> >> >> Is it possible that it is smartd? It is the only daemon that could do >> some low level access to the device (bypassing the filesystem) > > > If you wait about 5 hours from the time of this post then go to the > smartmontools mirror at: > https://github.com/mirror/smartmontools > > To check it is the revision (svn rev >= 4718) you need for this fix, look > at the top of the ChangeLog file and look for today's date (20180307). > Assuming it is there, clone it then try to build smartmontools > ( './autogen.sh ; ./configure ; make install') and try the new smartd ***. > You should get one warning per 8 TB device (for each run of smartd) and no > more. > > Currently smartmontools only has a quirks database (and it is large) > for ATA devices, not real or pseudo SCSI device, nor NVMe devices (yet). > Hopefully this fix will be sufficient. > > If it does not work, please send me the details. > > Doug Gilbert > > > *** without a --prefix=/usr/sbin or similar option to .configure I think > that smartd will be placed in /usr/local/sbin which may be different > from where your distro places it. Your PATH will determine which one > is used. > >> >>> >>>> /* >>>> * Many devices do not respond properly to >>>> READ_CAPACITY_16. >>>> * Tell the SCSI layer to try READ_CAPACITY_10 first. >>>> * However some USB 3.0 drive enclosures return >>>> capacity >>>> * modulo 2TB. Those must use READ_CAPACITY_16 >>>> */ >>>> if (!(us->fflags & US_FL_NEEDS_CAP16)) >>>> sdev->try_rc_10_first = 1; >>> >>> >>> >>> if that's the cause, maybe an entry in drivers/usb/storage/unusual_devs.h >>> would help, but that's really just guessing as I'm not familiar with USB >>> >> >> It seems that the bridge does have an entry in unusual_devs.h: >> >> /* Reported by Michael Büsch <m@xxxxxxx> */ >> UNUSUAL_DEV( 0x152d, 0x0567, 0x0114, 0x0116, >> "JMicron", >> "USB to ATA/ATAPI Bridge", >> USB_SC_DEVICE, USB_PR_DEVICE, NULL, >> US_FL_BROKEN_FUA ), >> >> VID:PID is 0x152d 0x0567, not sure what are the other two numbers, so >> I went back and used another enclosure with same USB to SATA bridge. >> The strange thing is that this other enclosure goes in UAS mode while >> the one for which I am reporting the issue goes in usb-storage mode >> because it gets somehow the quirks 0x50000000 >> Unfortunately I cannot move these 5 HDDs in the other enclosure. So do >> you think that it shall be reported to linux-usb maybe? >> >
