Load Monitor for Linux: lm::LoadMonitor::DriveStats::OneDriveStats Class Reference


Public Member Functions
	OneDriveStats (const std::string &line)
bool	IsDriveDevice (void) const
	Test if this drive is physical drive or partition.
bool	IsIDE (void) const
	Is this device connceted through the IDE bus?
bool	IsSCSI (void) const
	Is this device connected through the SCSI bus?
Data Fields
int	major
	Major device number.
int	minor
	Minor device number.
char	name [DRIVE_NAME_LENGTH]
	Device name.
unsigned long	stat_fields [COLUMN_COUNT]
	Stats fields.
Static Public Attributes
static const size_t	DRIVE_NAME_LENGTH = 16
	Length of the device name.
static const size_t	COLUMN_COUNT = 11
	Total number of data columns for each drive (2.6.0+).
static const long	SECTOR_SIZE = 512
	Size of the sector in bytes.
static const size_t	READS_ISSUED_COUNT = 0
	Total number of the reads.
static const size_t	READS_MERGED = 1
	Total number of merged reads.
static const size_t	READ_SECTORS = 2
	Total number of sectors read.
static const size_t	READ_MILLISECONDS = 3
	Total time spent reading data from the drive.
static const size_t	WRITES_COMPLETED = 4
	Total number of writes completed.
static const size_t	WRITES_MERGED = 5
	Total number of merged writes.
static const size_t	WRITE_SECTORS = 6
	Total number of sectors written.
static const size_t	WRITE_MILLISECONDS = 7
	Total time spent writing.
static const size_t	IOS_IN_PROGRESS = 8
	Number of IO operations in progress.
static const size_t	IO_MILLISECONDS = 9
	Total time spent doing IO operations.
static const size_t	IO_WEIGHTED_MILLISECONDS = 10
	Weighted time spent doing IO operations.

Detailed Description

All field except ninth one (IOS_IN_PROGRESS) are cummulative since last boot. More details about the diskstats file can be found in the kernel sources in Documenttation/iostats.txt file.

Constructor & Destructor Documentation

lm::LoadMonitor::DriveStats::OneDriveStats::OneDriveStats ( const std::string & line )

Parameters:

line

One line from the /proc/diskstats file.

Member Function Documentation

bool lm::LoadMonitor::DriveStats::OneDriveStats::IsDriveDevice ( void ) const

Test if this drive is physical drive or partition.

This will test if device that this object represents is device of the disk drive of if it is partition. Drive devices have names like "hda", "hdb", etc., while paritions have names like "hda0", "hda1", etc. That is, this method tests if name of the device ends with a number.

Returns:: true if name of the device does not end with a number, false otherwise.

bool lm::LoadMonitor::DriveStats::OneDriveStats::IsIDE ( void ) const

Is this device connceted through the IDE bus?

Test if device represented by this object is connected through the IDE bus. Note that this tests only for IDE disks, that is devices with names beginning with "hd".

Returns:: true if this device is an IDE disk, false otherwise.

bool lm::LoadMonitor::DriveStats::OneDriveStats::IsSCSI ( void ) const

Is this device connected through the SCSI bus?

Test if device represented by this object is connected through the SCSI bus. Note that this tests only for SCSI disks, that is devices with names beginning with "sd".