Supported ioctl() operations¶

For compatibility with applications written for the cciss(4) and hpsa(4) drivers, many, but not all of the ioctl(2) operations supported by the hpsa driver are also supported by the smartpqi driver. The data structures used by these operations are described in the Linux kernel source file include/linux/cciss_ioctl.h.

CCISS_DEREGDISK

CCISS_REGNEWDISK

CCISS_REGNEWD

These operations all do exactly the same thing, which is to cause the driver to re-scan for new devices. This does exactly the same thing as writing to the smartpqi-specific host rescan attribute.

CCISS_GETPCIINFO

This operation returns the PCI domain, bus, device, and function and "board ID" (PCI subsystem ID).

CCISS_GETDRIVVER

This operation returns the driver version in four bytes, encoded as:

(major_version << 28) | (minor_version << 24) |


        (release << 16) | revision
    

CCISS_PASSTHRU

Allows BMIC and CISS commands to be passed through to the controller.

Boot options¶

disable_device_id_wildcards={0|1}

Disables support for device ID wildcards. The default value is 0 (wildcards are enabled).

disable_heartbeat={0|1}

Disables support for the controller's heartbeat check. This parameter is used for debugging purposes. The default value is 0 (the controller's heartbeat check is enabled).

disable_ctrl_shutdown={0|1}

Disables support for shutting down the controller in the event of a controller lockup. The default value is 0 (controller will be shut down).

lockup_action={none|reboot|panic}

Specifies the action the driver takes when a controller lockup is detected. The default action is none.

parameter	action
none	take controller offline only
reboot	reboot the system
panic	panic the system

expose_ld_first={0|1}

This option exposes logical devices to the OS before physical devices. The default value is 0 (physical devices exposed first).

hide_vsep={0|1}

This option disables exposure of the virtual SEP to the OS. The default value is 0 (virtual SEP is exposed).

disable_managed_interrupts={0|1}

Disables driver utilization of Linux kernel managed interrupts for controllers. The managed interrupts feature automatically distributes interrupts to all available CPUs and assigns SMP affinity. The default value is 0 (managed interrupts enabled).

ctrl_ready_timeout={0|[30,1800]}

This option specifies the timeout in seconds for the driver to wait for the controller to be ready. The valid range is 0 or [30, 1800]. The default value is 0, which causes the driver to use a timeout of 180 seconds.

Device nodes¶

Disk drives are accessed via the SCSI disk driver (sd), tape drives via the SCSI tape driver (st), and the RAID controller via the SCSI generic driver (sg), with device nodes named /dev/sd*, /dev/st*, and /dev/sg*, respectively.

SmartPQI-specific host attribute files in /sys¶

/sys/class/scsi_host/host*/rescan

The host rescan attribute is a write-only attribute. Writing to this attribute will cause the driver to scan for new, changed, or removed devices (e.g., hot-plugged tape drives, or newly configured or deleted logical volumes) and notify the SCSI mid-layer of any changes detected. Usually this action is triggered automatically by configuration changes, so the user should not normally have to write to this file. Doing so may be useful when hot-plugging devices such as tape drives or entire storage boxes containing pre-configured logical volumes.

/sys/class/scsi_host/host*/lockup_action

The host lockup_action attribute is a read/write attribute. This attribute will cause the driver to perform a specific action in the unlikely event that a controller lockup has been detected. See OPTIONS above for an explanation of the lockup_action values.

/sys/class/scsi_host/host*/driver_version

The driver_version attribute is read-only. This attribute contains the smartpqi driver version.

For example:

$ 
cat /sys/class/scsi_host/host1/driver_version
1.1.2-126
    

/sys/class/scsi_host/host*/firmware_version

The firmware_version attribute is read-only. This attribute contains the controller firmware version.

For example:

$ 
cat /sys/class/scsi_host/host1/firmware_version
1.29-112
    

/sys/class/scsi_host/host*/model

The model attribute is read-only. This attribute contains the product identification string of the controller.

For example:

$ 
cat /sys/class/scsi_host/host1/model
1100-16i
    

/sys/class/scsi_host/host*/serial_number

The serial_number attribute is read-only. This attribute contains the unique identification number of the controller.

For example:

$ 
cat /sys/class/scsi_host/host1/serial_number
6A316373777
    

/sys/class/scsi_host/host*/vendor

The vendor attribute is read-only. This attribute contains the vendor identification string of the controller.

For example:

$ 
cat /sys/class/scsi_host/host1/vendor
Adaptec
    

/sys/class/scsi_host/host*/enable_stream_detection

The enable_stream_detection attribute is read-write. This attribute enables/disables stream detection in the driver. Enabling stream detection can improve sequential write performance for ioaccel-enabled volumes. See the ssd_smart_path_enabled disk attribute section for details on ioaccel-enabled volumes. The default value is 1 (stream detection enabled).

Enable example:

$ 
echo 1 > /sys/class/scsi_host/host1/enable_stream_detection
    

/sys/class/scsi_host/host*/enable_r5_writes

The enable_r5_writes attribute is read-write. This attribute enables/disables RAID 5 write operations for ioaccel-enabled volumes. Enabling can improve sequential write performance. See the ssd_smart_path_enabled disk attribute section for details on ioaccel-enabled volumes. The default value is 1 (RAID 5 writes enabled).

Enable example:

$ 
echo 1 > /sys/class/scsi_host/host1/enable_r5_writes
    

/sys/class/scsi_host/host*/enable_r6_writes

The enable_r6_writes attribute is read-write. This attribute enables/disables RAID 6 write operations for ioaccel-enabled volumes. Enabling can improve sequential write performance. See the ssd_smart_path_enabled disk attribute section for details on ioaccel-enabled volumes. The default value is 1 (RAID 6 writes enabled).

Enable example:

$ 
echo 1 > /sys/class/scsi_host/host1/enable_r6_writes
    

SmartPQI-specific disk attribute files in /sys¶

In the file specifications below, c stands for the number of the appropriate SCSI controller, b is the bus number, t the target number, and l is the logical unit number (LUN).

/sys/class/scsi_disk/c:b:t:l/device/raid_level

The raid_level attribute is read-only. This attribute contains the RAID level of the logical volume.

For example:

$ 
cat /sys/class/scsi_disk/4:0:0:0/device/raid_level
RAID 0
    

/sys/class/scsi_disk/c:b:t:l/device/sas_address

The sas_address attribute is read-only. This attribute contains the SAS address of the device.

For example:

$ 
cat /sys/class/scsi_disk/1:0:3:0/device/sas_address
0x5001173d028543a2
    

/sys/class/scsi_disk/c:b:t:l/device/ssd_smart_path_enabled

The ssd_smart_path_enabled attribute is read-only. This attribute is for ioaccel-enabled volumes. (Ioaccel is an alternative driver submission path that allows the driver to send I/O requests directly to backend SCSI devices, bypassing the controller firmware. This results in an increase in performance. This method is used for HBA disks and for logical volumes comprised of SSDs.) Contains 1 if ioaccel is enabled for the volume and 0 otherwise.

For example:

$ 
cat /sys/class/scsi_disk/1:0:3:0/device/ssd_smart_path_enabled
0
    

/sys/class/scsi_disk/c:b:t:l/device/lunid

The lunid attribute is read-only. This attribute contains the SCSI LUN ID for the device.

For example:

$ 
cat /sys/class/scsi_disk/13:1:0:3/device/lunid
0x0300004000000000
    

/sys/class/scsi_disk/c:b:t:l/device/unique_id

The unique_id attribute is read-only. This attribute contains a 16-byte ID that uniquely identifies the device within the controller.

For example:

$ 
cat /sys/class/scsi_disk/13:1:0:3/device/unique_id
600508B1001C6D4723A8E98D704FDB94
    

/sys/class/scsi_disk/c:b:t:l/device/path_info

The path_info attribute is read-only. This attribute contains the c:b:t:l of the device along with the device type and whether the device is Active or Inactive. If the device is an HBA device, path_info will also display the PORT, BOX, and BAY the device is plugged into.

For example:

$ 
cat /sys/class/scsi_disk/13:1:0:3/device/path_info
[13:1:0:3]    Direct-Access     Active
$ 
cat /sys/class/scsi_disk/12:0:9:0/device/path_info
[12:0:9:0]  Direct-Access   PORT: C1 BOX: 1 BAY: 14 Inactive
[12:0:9:0]  Direct-Access   PORT: C0 BOX: 1 BAY: 14 Active
    

/sys/class/scsi_disk/c:b:t:l/device/raid_bypass_cnt

The raid_bypass_cnt attribute is read-only. This attribute contains the number of I/O requests that have gone through the ioaccel path for ioaccel-enabled volumes. See the ssd_smart_path_enabled disk attribute section for details on ioaccel-enabled volumes.

For example:

$ 
cat /sys/class/scsi_disk/13:1:0:3/device/raid_bypass_cnt
0x300
    

/sys/class/scsi_disk/c:b:t:l/device/sas_ncq_prio_enable

The sas_ncq_prio_enable attribute is read/write. This attribute enables SATA NCQ priority support. This attribute works only when device has NCQ support and controller firmware can handle IO with NCQ priority attribute.

For example:

$ 
echo 1 > /sys/class/scsi_disk/13:1:0:3/device/sas_ncq_prio_enable
    

Configuration¶

To configure a Microchip Smart Storage controller, refer to the User Guide for the controller, which can be found by searching for the specific controller at https://www.microchip.com/design-centers/storage.