mirror of
https://github.com/SCST-project/scst.git
synced 2026-05-16 10:11:28 +00:00
240d5511be
git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@304 d57e44dd-8a1f-0410-8b47-8ef2f437770f
107 lines
4.0 KiB
Plaintext
107 lines
4.0 KiB
Plaintext
SCSI RDMA Protocol (SRP) Target driver for Linux
|
|
=================================================
|
|
|
|
SRP Target driver is designed to work directly on top of OpenFabrics
|
|
OFED-1.x software stack (http://www.openfabrics.org) or Infiniband
|
|
drivers in Linux kernel tree (kernel.org). It also interfaces with
|
|
Generic SCSI target mid-level driver - SCST (http://scst.sourceforge.net)
|
|
|
|
NOTES: This SRP Target driver can only compile and work with IB driver
|
|
in Linux vanilla kernel. It does not compile and work with IB
|
|
driver in OFED-1.x packages
|
|
|
|
If you want to work with IB driver in OFED-1.x package, you should
|
|
read and follow instruction in README.ofed file
|
|
|
|
|
|
Installation
|
|
------------
|
|
$ make
|
|
$ make install
|
|
|
|
To minimize QUEUEFULL conditions, please apply scst_increase_max_tgt_cmds
|
|
patch and recompile scst
|
|
|
|
$ cd ~scst/trunk
|
|
$ patch -p0 < srpt/patches/scst_increasa_max_tgt_cmds.patch
|
|
$ make scst scst_install srpt srpt_install
|
|
|
|
|
|
How-to run
|
|
-----------
|
|
A. On srp target machine
|
|
1. Please refer to SCST's README for loading scst driver and its
|
|
dev_handlers drivers (scst_disk, scst_vdisk block or file IO mode, nullio, ...)
|
|
|
|
Example 1: working with real back-end scsi disks
|
|
a. modprobe scst
|
|
b. modprobe scst_disk
|
|
c. cat /proc/scsi_tgt/scsi_tgt
|
|
|
|
ibstor00:~ # cat /proc/scsi_tgt/scsi_tgt
|
|
Device (host:ch:id:lun or name) Device handler
|
|
0:0:0:0 dev_disk
|
|
4:0:0:0 dev_disk
|
|
5:0:0:0 dev_disk
|
|
6:0:0:0 dev_disk
|
|
7:0:0:0 dev_disk
|
|
|
|
Now you want to exclude the first scsi disk and expose the last 4 scsi disks as
|
|
IB/SRP luns for I/O
|
|
echo "add 4:0:0:0 0" >/proc/scsi_tgt/groups/Default/devices
|
|
echo "add 5:0:0:0 1" >/proc/scsi_tgt/groups/Default/devices
|
|
echo "add 6:0:0:0 2" >/proc/scsi_tgt/groups/Default/devices
|
|
echo "add 7:0:0:0 3" >/proc/scsi_tgt/groups/Default/devices
|
|
|
|
Example 2: working with VDISK FILEIO mode (using md0 device and file 10G-file)
|
|
a. modprobe scst
|
|
b. modprobe scst_vdisk
|
|
c. echo "open vdisk0 /dev/md0" > /proc/scsi_tgt/vdisk/vdisk
|
|
d. echo "open vdisk1 /10G-file" > /proc/scsi_tgt/vdisk/vdisk
|
|
e. echo "add vdisk0 0" >/proc/scsi_tgt/groups/Default/devices
|
|
f. echo "add vdisk1 1" >/proc/scsi_tgt/groups/Default/devices
|
|
|
|
Example 3: working with VDISK BLOCKIO mode (using md0 device, sda, and cciss/c1d0)
|
|
a. modprobe scst
|
|
b. modprobe scst_vdisk
|
|
c. echo "open vdisk0 /dev/md0 BLOCKIO" > /proc/scsi_tgt/vdisk/vdisk
|
|
d. echo "open vdisk1 /dev/sda BLOCKIO" > /proc/scsi_tgt/vdisk/vdisk
|
|
e. echo "open vdisk2 /dev/cciss/c1d0 BLOCKIO" > /proc/scsi_tgt/vdisk/vdisk
|
|
f. echo "add vdisk0 0" >/proc/scsi_tgt/groups/Default/devices
|
|
g. echo "add vdisk1 1" >/proc/scsi_tgt/groups/Default/devices
|
|
h. echo "add vdisk2 2" >/proc/scsi_tgt/groups/Default/devices
|
|
|
|
2. modprobe ib_srpt
|
|
|
|
|
|
B. On initiator machines you can manualy do the following steps:
|
|
1. modprobe ib_srp
|
|
2. ipsrpdm -c (to discover new SRP target)
|
|
3. echo <new target info> > /sys/class/infiniband_srp/srp-mthca0-1/add_target
|
|
4. fdisk -l (will show new discovered scsi disks)
|
|
|
|
Example:
|
|
Assume that you use port 1 of first HCA in the system ie. mthca0
|
|
|
|
[root@lab104 ~]# ibsrpdm -c -d /dev/infiniband/umad0
|
|
id_ext=0002c90200226cf4,ioc_guid=0002c90200226cf4,
|
|
dgid=fe800000000000000002c90200226cf5,pkey=ffff,service_id=0002c90200226cf4
|
|
[root@lab104 ~]# echo id_ext=0002c90200226cf4,ioc_guid=0002c90200226cf4,
|
|
dgid=fe800000000000000002c90200226cf5,pkey=ffff,service_id=0002c90200226cf4 >
|
|
/sys/class/infiniband_srp/srp-mthca0-1/add_target
|
|
|
|
OR
|
|
|
|
+ You can edit /etc/infiniband/openib.conf to load srp driver and srp HA daemon
|
|
automatically ie. set SRP_LOAD=yes, and SRPHA_ENABLE=yes
|
|
+ To set up and use high availability feature you need dm-multipath driver
|
|
and multipath tool
|
|
+ Please refer to OFED-1.x SRP's user manual for more in-details instructions
|
|
on how-to enable/use HA feature
|
|
|
|
|
|
TO DO
|
|
------
|
|
+ Stress test and stabilize the code
|
|
+ Performance tuning
|