06-12-2014
Blockdev vs /sys/block/
Hello,
I want to set/get the read-ahead for my disks and there is a little issue that confuses me. There are three ways to get/set the read-ahead buffer:
1. cat /sys/block/md0/bdi/read_ahead_kb
2. cat /sys/block/md0/queue/read_ahead_kb
3. blockdev --getra /dev/md0
Which one is the correct one? The first two gives me a value of 128. The last one gives me a value of 256. Where does this difference come from?
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LEARN ABOUT FREEBSD
sbp_targ
SBP_TARG(4) BSD Kernel Interfaces Manual SBP_TARG(4)
NAME
sbp_targ -- Serial Bus Protocol 2 (SBP-2) Target Mode devices driver
SYNOPSIS
To compile this driver into the kernel, place the following lines in your kernel configuration file:
device sbp_targ
device firewire
device scbus
device targ
Alternatively, to load the driver as a module at boot time, place the following lines in loader.conf(5):
firewire_load="YES"
cam_load="YES"
sbp_targ_load"YES"
DESCRIPTION
The sbp_targ driver provides support for SBP-2 target mode. This driver is supposed to work with cam(4), targ(4) and firewire(4). You also
need to use scsi_target(8), which can be found in /usr/share/examples/scsi_target, to provide actual devices.
EXAMPLES
# mdconfig -a -t malloc -s 10m
md0
# scsi_target 0:0:0 /dev/md0
(Assuming sbp_targ0 on scbus0)
SEE ALSO
cam(4), firewire(4), targ(4), camcontrol(8), fwcontrol(8), kldload(8), scsi_target(8)
AUTHORS
The sbp_targ driver was written by Hidetoshi Shimokawa.
BUGS
This driver is currently under development. It does not work correctly in multi-initiator environments or after the bus topology has been
changed.
BSD
November 7, 2003 BSD