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The industry is working on SAS host managed drives supporting the ZBC specification. It would be helpful if smartctl could read some basic SAS parameters on these drives, such as power on hours and grown defect list entries.

The current issue is that these SAS HM drives are a different peripheral type (0x14) from a standard direct access drive (0x0), as per SPC-5, so in scsiprint.cpp they are not being recognized in the is_disk variable in the scsiPrintMain function.

I have made local changes to support Seagate SAS HM drives. All that needs changing is an additional SCSI Peripheral Type in scsicmds.h (host managed device, 14h, see link below), and a check for that in scsiprint.cpp (in scsiPrintMain, in the is_disk check).

​https://en.wikipedia.org/wiki/SCSI_Peripheral_Device_Type

The supported SMART commands are described here:

The SMART Command Feature Set ​http://www.micron.com/get-document/?documentId=5611

root@ubuntu:~# lsusb -v -d 0634:0655

Bus 001 Device 004: ID 0634:0655 Micron Technology, Inc. Device Descriptor:

bLength 18 bDescriptorType 1 bcdUSB 2.00 bDeviceClass 0 (Defined at Interface level) bDeviceSubClass 0 bDeviceProtocol 0 bMaxPacketSize0 64 idVendor 0x0634 Micron Technology, Inc. idProduct 0x0655 bcdDevice 11.00 iManufacturer 1 Micron Technology iProduct 2 Real SSD eUSB 4GB iSerial 3 ECF0042700008939 bNumConfigurations 1 Configuration Descriptor:

bLength 9 bDescriptorType 2 wTotalLength 32 bNumInterfaces 1 bConfigurationValue 1 iConfiguration 0 bmAttributes 0x80

(Bus Powered)

MaxPower 200mA Interface Descriptor:

bLength 9 bDescriptorType 4 bInterfaceNumber 0 bAlternateSetting 0 bNumEndpoints 2 bInterfaceClass 8 Mass Storage bInterfaceSubClass 6 SCSI bInterfaceProtocol 80 Bulk (Zip) iInterface 0 Endpoint Descriptor:

bLength 7 bDescriptorType 5 bEndpointAddress 0x81 EP 1 IN bmAttributes 2

Transfer Type Bulk Synch Type None Usage Type Data

wMaxPacketSize 0x0200 1x 512 bytes bInterval 255

Endpoint Descriptor:

bLength 7 bDescriptorType 5 bEndpointAddress 0x02 EP 2 OUT bmAttributes 2

Transfer Type Bulk Synch Type None Usage Type Data

wMaxPacketSize 0x0200 1x 512 bytes bInterval 255

Device Qualifier (for other device speed):

bLength 10 bDescriptorType 6 bcdUSB 2.00 bDeviceClass 0 (Defined at Interface level) bDeviceSubClass 0 bDeviceProtocol 0 bMaxPacketSize0 64 bNumConfigurations 1

Device Status: 0x0000

(Bus Powered)

root@ubuntu:~# /tmp/smartctl /dev/sda smartctl 5.40 2010-10-16 r3189 [i686-pc-linux-gnu] (local build) Copyright (C) 2002-10 by Bruce Allen, ​http://smartmontools.sourceforge.net

/dev/sda: Unknown USB bridge [0x0634:0x0655 (0x1100)] Smartctl: please specify device type with the -d option.

Use smartctl -h to get a usage summary

root@ubuntu:~# /tmp/smartctl -d scsi -a /dev/sda smartctl 5.40 2010-10-16 r3189 [i686-pc-linux-gnu] (local build) Copyright (C) 2002-10 by Bruce Allen, ​http://smartmontools.sourceforge.net

Device: MICRON eUSB DISK Version: 1100

Terminate command early due to bad response to IEC mode page

A mandatory SMART command failed: exiting. To continue, add one or more '-T permissive' options.

Latest FreeBSD has new ahci(4) driver for AHCI SATA controllers. SATA disks on these controllers are represented as 'ada' disks. These are "normal" SATA disks that support usual ATA/SATA commands. The difference from traditional 'ad' disks is that 'ada' disks do not support ata(4) ioctls, instead commands can be sent using cam(3). Proposed patch adds initial support for such disks. To achieve this freebsd_ata_device is subclassed to reuse the code for building ATA commands. Then cam(3) transport is used to send commands to disks (this is somewhat similar to scsi disks code).

Currently auto-discovery of ada disks is not implemented.