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Gentoo HOWTO added, thanks to Willem Boterenbrood <Willem@kerrigan.student.utwente.nl>

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git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@1290 d57e44dd-8a1f-0410-8b47-8ef2f437770f
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Vladislav Bolkhovitin
2009-10-28 19:22:15 +00:00
parent 923a54bdfe
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iscsi-scst/doc/SCST_Gentoo_HOWTO.txt Normal file
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1) If you haven't done so already install a base gentoo installation:
download: http://www.gentoo.org/main/en/where.xml
documentation: http://www.gentoo.org/doc/en/handbook/index.xml
2) Lets make sure our package info is up2date
'emerge --sync'
3) You can get the SCST source files from http://scst.sourceforge.net/downloads.html
As I want a stable platform I use the downloads from "Download released versions"
For the iscsi-target we need three files: scst, iscsi-scst and scstadmin.
You can get these files in varios ways, in the example they are downloaded with links.
If links is not already installed install it:
'emerge links'
Go the the directory where you want the files (the example uses /root) and get the files:
'cd /root'
'links http://scst.sourceforge.net/downloads.html'
and download under stable the three needed files, at this moment they are scst-1.0.1.1.tar.gz, scstadmin-1.0.6.tar.gz and iscsi-scst-1.0.1.1.tar.gz
after downloading exit links:
'q'
4) Now extract the three downloaded files
'tar -zxf scst-1.0.1.1.tar.gz'
'tar -zxf scstadmin-1.0.6.tar.gz'
'tar -zxf iscsi-scst-1.0.1.1.tar.gz'
5) Because SCST needs some kernel patches we need to check which kernels are supported.
'ls /root/scst-1.0.1.1/kernel/'
This shows a list of kernel patches, we can see now the newest kernel scst 1.0.1.1 has patches for is kernel 2.6.29.
Now lets see which is the newest gentoo kernel.
'emerge --search gentoo-sources'
This shows the current installed kernel (if you are running the gentoo-sources kernel) and the newest version at this moment is 2.6.30-r6.
As we need an older kernel to use SCST we will need to explicitly tell emerge which kernel we want.
To find out which kernel we need we can take a look at http://packages.gentoo.org/package/sys-kernel/gentoo-sources
'links http://packages.gentoo.org/package/sys-kernel/gentoo-sources'
You will need to scroll down a bit to see the table. At this moment is shows that 2.6.29-r5 is the newest for the x86 and amd64 platform, so we want the 29-r5 kernel.
'emerge =gentoo-sources-2.6.29-r5'
The kernel source will now be in /usr/src/linux-2.6.29-gentoo-r5
6) Now we need to patch the kernel sources. First we set the /usr/src/linux link to the new kernel sources.
'rm /usr/src/linux'
'ln -s /usr/src/linux-2.6.29-gentoo-r5/ /usr/src/linux'
There are multiple kernel patches for SCST and not all are required but give better performance or new features.
Read the documentation from SCST to see what the patches are for and which ones you need/want.
The kernel patches are in /root/scst-1.0.1.1/kernel/ and /root/iscsi-scst-1.0.1.1/kernel/patches/.
Now Patch the kernel sources
'cd /usr/src/linux'
'patch -p1 < /root/scst-1.0.1.1/kernel/io_context-2.6.29.patch'
'patch -p1 < /root/scst-1.0.1.1/kernel/scst_exec_req_fifo-2.6.29.patch'
'patch -p1 < /root/scst-1.0.1.1/kernel/readahead-context-2.6.29.patch'
'patch -p1 < /root/scst-1.0.1.1/kernel/readahead-2.6.29.patch'
'patch -p1 < /root/iscsi-scst-1.0.1.1/kernel/patches/put_page_callback-2.6.29.patch'
? not required 'make clean'
7) Lets configure and build the kernel
'make menuconfig'
Make sure to enable a few kernel options.
in Networking Support -> Networking Options:
"TCP/IP networking" and "TCP/IP zero-copy transfer completion notification"
in Device Drivers -> SCSI Device Support:
"SCSI disk support"
Make sure you include all needed storage and lan drivers
-----optional, for maximum performance:-----
in Enable the block layer -> IO Schedulers
enable "CFQ I/O scheduler"
set "Default I/O scheduler" to "CFQ"
in Processor type and features
set "Preemption Model" to "No Forced Preemption (Server)"
set "High Memory Support" to "off" (use a 64bit kernel when using more then 1GB of RAM to get the best performance)
in File systems
enable "XFS filesystem support" (XFS is much faster then ext3 when using virtual-file-devices for the iSCSI target)
-----optional end-----
Build the kernel and install the kernel modules
'make'
'make modules_install'
Now copy the kernel to the boot directory (replace the directory after arch with your architecture, x86 for example)
'cp arch/x86_64/boot/bzImage /boot/kernel-2.6.29-gentoo-r5'
Add the new kernel to the configuration as described in the gentoo handbook (with grub you should edit /boot/grub/grub.conf)
Reboot the system with the new kernel
'shutdown -r now'
8) Lets configure, build and install SCST
'cd /root/scst-1.0.1.1/src'
'make all'
'make install'
9) Build and install scstadmin
'cd /root/scstadmin-1.0.6'
'make all'
'make install'
Remove the scst_disk module from the startup file
'nano -w /etc/init.d/scst'
change the line SCST_MODULES="scst scst-disk scst_vdisk" to SCST_MODULES="scst scst_vdisk"
10) Build and install iscsi-scst
'cd /root/iscsi-scst-1.0.1.1'
'make all'
'make install'
'cp etc/initiators.* /etc'
'cp etc/iscsi-scstd.conf /etc'
11) Make SCST init script work
As the scst init scipt uses lsb init-functions which are not available for gentoo scst can not run yet.
There are two easy ways to make it work. 1) Modify the SCST init script so it doesn't use init-functions. 2) Get the required init-functions scripts from another distro.
Choose one these options.
11-1) Modify the SCST script
The simplest way to do this is to remove/replace all lsb init-functions.
- remove or comment (put a # in front of) the line ". /lib/lsb/init-functions"
- replace all 'log_failure_msg' with 'echo "failure"' and replace all 'log_success_msg' with 'echo "succes"'
11-2) Get /lib/lsb/init-functions and /etc/rc.status from another distribution
See an example on how to do this on http://www.gentoo-wiki.info/Rivendell and only do the actions as described under "File creation"
Now you should have created /etc/rc.status and /lib/lsb/init-functions and set their permissions.
12) Configure iSCSI-SCST configuration
choose a target name and disk names and set it iscsi-scstd.conf, see the comments on the target name requirements in the same file.
'nano -w /etc/iscsi-scstd.conf'
-----example iscsi-scstd.conf-----
Target iqn.2009-10.nl.feka:storage.disk.1.vms
Target iqn.2009-10.nl.feka:storage.disk.2.iso
Target iqn.2009-10.nl.feka:storage.filedisk.1.backup
-----example end-----
13) Configure SCST configuration
SCSTadmin can create the SCST config but needs SCST to be loaded, unfortunately the initscript does not load SCST when scst.conf is not there.
Create an empty scst.conf.
'touch /etc/scst.conf'
Start SCST
'/etc/init.d/scst start'
Create an empty configuration.
'scstadmin -ClearConfig /etc/scst.conf'
Add the iSCSI disk(s), make sure to replace the device name(s) in the command(s) below:
'scstadmin -adddev disk01 -path /dev/sdb1 -handler vdisk -options BLOCKIO' (use this to add a disk/partition/file in BlockIO mode without caching)
'scstadmin -adddev disk02 -path /dev/sdc -handler vdisk -options NV_CACHE' (use this to add a disk/partition/file in FileIO mode with linux cache)
'scstadmin -adddev disk03 -path /root/vhdd1 -handler vdisk -options NV_CACHE' (use this to add a disk/partition/file in FileIO mode with linux cache)
Create a group for each target. (make sure to name the entry after Default_ the same as the names specified in iscsi-scstd.conf)
'scstadmin -addgroup Default_iqn.2009-10.nl.feka:storage.disk.1.vms'
'scstadmin -addgroup Default_iqn.2009-10.nl.feka:storage.disk.2.iso'
'scstadmin -addgroup Default_iqn.2009-10.nl.feka:storage.filedisk.1.backup'
Assign the device(s) to the group(s).
'scstadmin -assigndev disk01 -group Default_iqn.2009-10.nl.feka:storage.disk.1.vms -lun 0'
'scstadmin -assigndev disk02 -group Default_iqn.2009-10.nl.feka:storage.disk.2.iso -lun 0'
'scstadmin -assigndev disk03 -group Default_iqn.2009-10.nl.feka:storage.filedisk.1.backup -lun 0'
Save the configuration.
'scstadmin -WriteConfig /etc/scst.conf'
14) Set initiator connection rights
As default disable all targets for all initiators.
Add one line to initiators.deny with "ALL ALL"
'nano -w /etc/initiators.deny'
-----example initiators.deny-----
ALL ALL
-----example end-----
Add the inititators that may access the targets to initiators.allow.
Add one line per initiator with all initiators that need access, see the comments in the same file
'nano -w /etc/initiators.allow'
-----example initiators.allow-----
iqn.2009-10.nl.feka:storage.disk.1.vms 192.168.1.1, 192.168.1.2, 192.168.1.3
iqn.2009-10.nl.feka:storage.disk.2.iso 192.168.1.1, 192.168.1.2, 192.168.1.3
iqn.2009-10.nl.feka:storage.filedisk.1.backup 192.168.1.10
-----example end-----
15) Add SCST and iSCSI-SCST to default run-level and start iscsi-scst
'rc-update add scst default'
'rc-update add iscsi-scst default'
'/etc/init.d/iscsi-scst start'
Willem Boterenbrood

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www/index.html
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<p><a href="scst_pg.html">HTML</a></p>
<p><a href="scst_pg.pdf">PDF</a></p>
<p><a href="iscsi-scst-howto.txt">HOWTO For iSCSI-SCST</a></p>
<p><a href="SCST_Gentoo_HOWTO.txt">Gentoo HOWTO For iSCSI-SCST</a></p>
<p><a href="qla2x00t-howto.html">HOWTO For QLogic Target Driver</a></p>
<p><a href="http://lpfcxxxx.sourceforge.net/HOWTO.lpfc">HOWTO For Emulex lpfc Target Driver</a></p>
<p><a href="scst_user_spec.txt">SCST User Interface Description</a></p>

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access to it.</p>
<p class="post-footer align-right">
<a href="iscsi-scst-howto.txt" class="readmore">HOWTO</a>
<a href="SCST_Gentoo_HOWTO.txt" class="readmore">Gentoo HOWTO</a>
<a href="downloads.html" class="readmore">Download</a>
<a href="http://scst.svn.sourceforge.net/" class="readmore">SCST SVN Repository</a>
</p>