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proc_scsi_write(9) [centos man page]

PROC_SCSI_WRITE(9)						  SCSI mid layer						PROC_SCSI_WRITE(9)

NAME
proc_scsi_write - handle writes to /proc/scsi/scsi SYNOPSIS
ssize_t proc_scsi_write(struct file * file, const char __user * buf, size_t length, loff_t * ppos); ARGUMENTS
file not used buf buffer to write length length of buf, at most PAGE_SIZE ppos not used DESCRIPTION
this provides a legacy mechanism to add or remove devices by Host, Channel, ID, and Lun. To use, "echo 'scsi add-single-device 0 1 2 3' > /proc/scsi/scsi" or "echo 'scsi remove-single-device 0 1 2 3' > /proc/scsi/scsi" with "0 1 2 3" replaced by the Host, Channel, Id, and Lun. NOTE
this seems to be aimed at parallel SCSI. Most modern busses (USB, SATA, Firewire, Fibre Channel, etc) dynamically assign these values to provide a unique identifier and nothing more. AUTHORS
James Bottomley <James.Bottomley@hansenpartnership.com> Author. Rob Landley <rob@landley.net> Author. COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 PROC_SCSI_WRITE(9)

Check Out this Related Man Page

scsi-spin(8)						      System Manager's Manual						      scsi-spin(8)

NAME
scsi-spin - spin up and down a SCSI device SYNOPSIS
scsi-spin [-options...] [device] DESCRIPTION
scsi-spin let the user to manually spin up and down a SCSI device. This command is particularly useful if you've got noisy (or hot) drives in a machine that you rarely need to access. This is not the same as the kernel patch that's floating around that will automatically spin down the drive after some time. scsi-spin is completely manual, and spinning down a drive that's in use, especially the one containing the scsi-spin binary, is probably a really bad idea. To avoid running in trouble with such cases, scsi-spin verifies that the device to work on is not currently in use by scanning the mounted file system description file for a partition living on it and issue an error if this the case. OPTIONS
-u, --up spin up device. -d, --down spin down device. -e, --loej load or eject medium from drive (use along with -u or -d ) -w, --wait=[n] wait up to n seconds for the spin up/down command to complete. Default is to return immediately after the command was sent to the device. Either repeat -w n times or set n to define the time to wait before to report a timeout. -l, --lock prevent removal of medium from device. -L, --unlock allow removal of medium from device. -I, --oldioctl use legacy ioctl interface instead of SG_IO to dialog with device (could not be supported on all platforms). -e and -w are not allowed with this option. -v, --verbose=[n] verbose mode. Either repeat -v or set n accordingly to increase verbosity. 1 is verbose, 2 is debug (dump SCSI commands and Sense buffer). -f, --force force spinning up/down the device even if it is in use. -n, --noact do nothing but check if the device is in use. -p, --proc use /proc/mounts instead of /etc/mtab to determine if the device is in use or not. device the device is any name in the filesystem which points to a SCSI block device (sd, scd) or generic SCSI device (sg). See section below. SCSI devices naming convention Old kernel naming convention It is typically /dev/sd[a-z] , /dev/scd[0-9]* or /dev/sg[0-9]*. scsidev naming convention It is typically /dev/scsi/s[rdg]h[0-9]*-e????c?i?l? or /dev/scsi/<aliasname>. devfs naming convention It is typically /dev/scsi/host[0-9]/bus[0-9]/target[0-9]/lun[0-9]/disc (same for cd and generic devices) or short name /dev/sd/c[0-9]b[0-9]t[0-9]u[0-9] when devfsd "new compatibility entries" naming scheme is enabled. SEE ALSO
scsiinfo(8), sg_start(8), sd(4), proc(5), AUTHORS
Eric Delaunay <delaunay@debian.org>, 2001 Rob Browning <rlb@cs.utexas.edu>, 1998 03 September 2001 scsi-spin(8)

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