scsa2usb(7D) (man pages section 7: Device and Network Interfaces)

man pages section 7: Device and Network Interfaces

scsa2usb(7D)

NAME

scsa2usb- SCSI to USB bridge driver

SYNOPSIS

storage@unit-address

DESCRIPTION

The scsa2usb driver is a USBA (Solaris USB architecture) compliant nexus driver that supports the USB Bulk Only Mass Storage Specification 1.0 and USB Control/Bulk/Interrupt (CBI) Transport 1.0. The scsa2usb driver also supports USB storage devices that implement CBI Transport without the interrupt completion for status (that is, Control/Bulk (CB) devices.) It supports bus-powered and self-powered USB mass storage devices. This nexus driver is both a USB client driver and a SCSA HBA driver. As such, the scsa2usb driver only supports disk devices that utilize the above two transports.

The scsa2usb nexus driver maps SCSA target driver requests to USBA client driver requests.

The scsa2usb driver creates a child device info node for each logical unit (LUN) on the mass storage device. The standard Solaris SCSI disk driver is attached to those nodes. Refer to sd(7D).

This driver supports multiple LUN devices and creates a separate child device info node for each LUN. All child LUN nodes attach to sd(7D).

A USB mass storage device can be managed by rmformat(1). With or without Volume Manager, you can mount, eject, hot remove and hot insert a USB mass storage device, as the following sections explain.

Some devices may be supported by the USB mass storage driver even though they do not identify themselves as compliant with the USB mass storage class.

The scsa2usb.conf file contains an attribute-override-list that lists the vendor ID, product ID, and revision for matching mass storage devices, as well as fields for overriding the default device attributes. The entries in this list are commented out by default, and may be uncommented to enable support of particular devices.

Follow the information given in the scsa2usb.conf file to see if a particular device can be supported using the override information. Also see http://www.sun.com/io.

Using Volume Management

Mass storage devices are managed by Volume Manager. vold(1M) creates a device nickname which can be listed with eject(1). The device is mounted using volrmmount(1) under /rmdisk/label.

See volrmmount(1M) to unmount the device and eject(1) to eject the media. If the device is ejected while it is mounted, vold(1M) unmounts the device before ejecting it. It also kills any active applications that are accessing the device.

Hot removing a mass storage device with vold(1M) active will fail with a console warning. To hot remove or insert a USB storage device, first stop vold(1M) by issuing the command /etc/init.d/volmgt stop. After the device has been removed or inserted, restart vold(1M) by issuing the command /etc/init.d/volmgt start.

You can also permanently disable vold for removable devices by commenting out the rmscsi line in vold.conf. See the System Administration Guide, Volume I and Solaris Common Desktop Environment: User's Guide for details on how to manage a removable device with CDE and Removable Media Manager. See dtfile.1X under CDE for information on how to use Removable Media Manager.

Using mount(1M) and umount(1M)

Use mount(1M) to mount the device and umount(1M) to unmount the device. Use eject(1) to eject the media. No vold nicknames can be used. (vold.1m is disabled.)

Removing the storage device while it is being accessed or mounted will fail with a console warning. To hot remove the storage device from the system, unmount the file system, then kill all applications accessing the device. Next, hot remove the device. A storage device can be hot inserted at any time.

For a comprehensive listing of (non-bootable) USB mass-storage devices that are compatible with this driver, see www.sun.com/io_technologies/storagesolutions.html.

DEVICE SPECIAL FILES

Block special file names are located in /dev/dsk; raw file names are located in /dev/rdsk. Input/output requests to the devices must follow the same restrictions as those for SCSI disks. Refer to sd(7D).

IOCTLS

Refer to dkio(7I) and cdio(7I).

ERRORS

Refer to sd(7D).

FILES

The device special files for the USB mass storage device are created like those for a SCSI disk. Refer to sd(7D).

/dev/dsk/cntndnsn: Block files
/dev/rdsk/cntndnsn: Raw files
/vol/dev/aliases/zip0: Symbolic link to the character device for the media in Zip drive 0
/vol/dev/aliases/jaz0: Symbolic link to the character device for the media in Jaz drive 0
/vol/dev/aliases/rmdisk0: Symbolic link to the character device for the media in removable drive 0. This is a generic removable media device
/kernel/drv/scsa2usb: 32-bit ELF kernel module
/kernel/drv/sparcv9/scsa2usb: 64-bit ELF kernel module
/kernel/drv/scsa2usb.conf: Can be used to override specific characteristics

ATTRIBUTES

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPE	ATTRIBUTE VALUE
Architecture	PCI-based systems
Availability	SUNWusb, SUNWusbx

DIAGNOSTICS

Refer to sd(7D).

In addition to being logged, the following messages may appear on the system console. All messages are formatted in the following manner:

Warning: <device path> (scsa2usb<instance number>): Error Message...

Cannot access device. Please reconnect <name>.: There was an error in accessing the mass-storage device during reconnect. Please reconnect the device.
Device reported incorrect luns (adjusting to 1).: The mass-storage device reported that it supports an invalid number of LUNs. The driver has adjusted the number of LUNs supported to 1.
Device is busy and cannot be suspended. Please close files, unmount and eject.: The system wide suspend failed because the mass-storage device is busy. Close the device, unmount the file system and eject the media before retrying the suspend.
Device is not identical to the previous one on this port. Please disconnect and reconnect.: Another USB device has been inserted on a port that was connected to a mass-storage device. Please disconnect the USB device and reconnect the mass-storage device back into that port.
Disconnected device was busy, please reconnect.: Disconnection of the mass-storage device failed because the device is busy. Please reconnect the device.
Reinserted device is accessible again.: The mass-storage device that was hot-removed from its USB slot has been re-inserted to the same slot and is available for access.
Syncing not supported.: While a system is panicking, a file system is mounted on the mass-storage media. Syncing is not supported by scsa2usb driver.

NOTES

The Zip 100 drive does not comply with Universal Serial Bus Specification 1.0 and cannot be power managed. Power Management support for Zip 100 has been disabled.

If the system panics while a UFS file system is mounted on the mass storage media, no syncing will take place for the mass-storage device. (Syncing is not supported by the scsa2usb driver.) As a result, the file system on the media will not be consistent on reboot.

If a PCFS file system is mounted, no syncing is needed and the filesystem will be consistent on reboot.

If a mass-storage device is busy, system suspend cannot proceed and the system will immediately resume again.

Attempts to remove a mass-storage device from the system will fail. The failure will be logged to the console. An attempt to replace the removed device with some other USB device will also fail. To successfully remove a USB mass-storage device you must "close" all references to it.

An Iomega Zip 100Mb disk cannot be formatted on an Iomega Zip250 drive. See the Iomega web site at http://www.iomega.com for details.

Concurrent I/O to devices with multiple LUNs on the same device is not supported.

Some USB CD-RW devices may perform inadequately at their advertised speeds. To compensate, use USB CD-RW devices at lower speeds (2X versus 4X). See cdrw(1) for details.

This driver also supports CBI devices that do not use USB interrupt pipe for status completion.

SunOS 5.9 Last Revised 28 Dec 2001