Red Hat Enterprise Linux 3 Update 2 Release Notes (IBM® S/390® Edition)

The following topics are covered in this document:

The following section includes information specific to the Red Hat Enterprise Linux installation program, Anaconda.

This section contains general information not specific to any other section of this document.

Red Hat Enterprise Linux 3 Update 2 features LAuS, the Linux Auditing System. This system is composed of kernel-resident and user-space components that facilitate highly-configurable and robust logging of system call use. This document provides an overview of how the auditing system is put together and basic information on how to get it running. Pointers to relevant documentation are also provided that should help in making the best use of this new capability.

To use the SCSI-over-fiber driver (known as zfcp), take the following steps:

1. Add the appropriate device map to the zfcp module options information in /etc/modules.conf

2. Make the appropriate device file(s)

3. Partition the disk(s) as desired

4. Use mkinitrd to generate a new initrd file

5. Run zipl to update the system bootloader

The first step is to create a device map appropriate for your system configuration. The exact format of the device map varies depending on the following variables:

· The number of devices

· The number of paths to those devices

· The number of LUNs to be presented by those devices

The following section illustrates several different device maps.

DEVICE MAPS FOR SINGLE DEVICE/SINGLE PATH/SINGLE LUN

In the following sample /etc/modules.conf file, a single SCSI LUN is presented to the kernel as /dev/sda; using device 0x4000, it presents the SCSI LUN 0x5010 to the Linux kernel via the supplied World-Wide Port Name (WWPN) 0x5105076300c213e9:

alias eth0 qeth
options dasd_mod dasd=200-201
options scsi_mod max_scsi_luns=50
options zfcp 'map="0x4000 0x01:0x5105076300c213e9 0x0:0x5010000000000000;"'

    

When the zfcp module is installed, console messages similar to the following show the drive identified as sda:

zfcp: zfcp_module_init: driver version 0x3009d 
  Vendor: IBM       Model: 2105F20           Rev: .674 
  Type:   Direct-Access                      ANSI SCSI revision: 03 
Attached scsi disk sda at scsi0, channel 0, id 1, lun 0 
SCSI device sda: 7812544 512-byte hdwr sectors (4000 MB) 

    

DEVICE MAPS FOR SINGLE DEVICE/SINGLE PATH/MULTIPLE LUNS

In the following sample /etc/modules.conf file, multiple SCSI LUNs are presented using a single path:

alias eth0 qeth
options dasd_mod dasd=200-201
options scsi_mod max_scsi_luns=50
options zfcp 'map="
0x4000 0x01:0x5105076300c213e9 0x0:0x5010000000000000;
0x4000 0x01:0x5105076300c213e9 0x1:0x5011000000000000;
0x4000 0x01:0x5105076300c213e9 0x2:0x5012000000000000 "'

    

When the zfcp module is installed, console messages similar to the following show the drives identified as sda through sdc:

zfcp: zfcp_module_init: driver version 0x3009d 
  Vendor: IBM       Model: 2105F20           Rev: .674 
  Type:   Direct-Access                      ANSI SCSI revision: 03 
  Vendor: IBM       Model: 2105F20           Rev: .674 
  Type:   Direct-Access                      ANSI SCSI revision: 03 
  Vendor: IBM       Model: 2105F20           Rev: .674 
  Type:   Direct-Access                      ANSI SCSI revision: 03 
Attached scsi disk sda at scsi0, channel 0, id 1, lun 0 
Attached scsi disk sdb at scsi0, channel 0, id 1, lun 1 
Attached scsi disk sdc at scsi0, channel 0, id 1, lun 2 
SCSI device sda: 7812544 512-byte hdwr sectors (4000 MB) 
SCSI device sdb: 7812544 512-byte hdwr sectors (4000 MB) 
SCSI device sdc: 7812544 512-byte hdwr sectors (4000 MB) 

    

DEVICE MAPS FOR MULTIPLE DEVICES/SINGLE PATH/MULTIPLE LUNS

In the following sample /etc/modules.conf file, multiple SCSI LUNs are presented using multiple devices. The map defines four disks using three devices (0x4000 through 0x4002) via 2 WWPNs (0x5105076300c213e9 and 0x5105076300cb13e9):

alias eth0 qeth
options dasd_mod dasd=200-201
options scsi_mod max_scsi_luns=50
options zfcp 'map="
0x4000 0x01:0x5105076300c213e9 0x0:0x5010000000000000;
0x4000 0x02:0x5105076300cb13e9 0x0:0x5011000000000000;
0x4001 0x01:0x5105076300c213e9 0x0:0x5012000000000000;
0x4002 0x01:0x5105076300c213e9 0x0:0x5013000000000000 "'

    

When the zfcp module is installed, console messages similar to the following show the drives identified as sda through sdd:

zfcp: zfcp_module_init: driver version 0x3009d 
  Vendor: IBM       Model: 2105F20           Rev: .674 
  Type:   Direct-Access                      ANSI SCSI revision: 03 
  Vendor: IBM       Model: 2105F20           Rev: .674 
  Type:   Direct-Access                      ANSI SCSI revision: 03 
  Vendor: IBM       Model: 2105F20           Rev: .674 
  Type:   Direct-Access                      ANSI SCSI revision: 03 
  Vendor: IBM       Model: 2105F20           Rev: .674 
  Type:   Direct-Access                      ANSI SCSI revision: 03 
Attached scsi disk sda at scsi0, channel 0, id 1, lun 0 
Attached scsi disk sdb at scsi0, channel 0, id 2, lun 0 
Attached scsi disk sdc at scsi1, channel 0, id 1, lun 0 
Attached scsi disk sdd at scsi2, channel 0, id 1, lun 0 
SCSI device sda: 7812544 512-byte hdwr sectors (4000 MB) 
SCSI device sdb: 7812544 512-byte hdwr sectors (4000 MB) 
SCSI device sdc: 7812544 512-byte hdwr sectors (4000 MB) 
SCSI device sdd: 7812544 512-byte hdwr sectors (4000 MB) 

    

The next step is to create the necessary device files. This is done via the mknod command. For example, to create a device file for the first SCSI disk, use the following command:

# mknod /dev/sda b 8 0

    

Note that you will likely require additional device files for partition access (sda1, for example). For more information, refer to the mknod man page.

Next, the disk can be partitioned. In addition to dividing the disk into more appropriately-sized partitions, this step also provides confirmation that the device map and device file have been properly created.

(The following example shows the fdisk utility being used, although parted (a more sophisticated and flexible disk partitioning utility) could also be used.)

# fdisk /dev/sda

Command (m for help): p

Disk /dev/sda: 4000 MB, 4000022528 bytes
124 heads, 62 sectors/track, 1016 cylinders
Units = cylinders of 7688 * 512 = 3936256 bytes

   Device Boot    Start       End    Blocks   Id  System
/dev/sda1             1       900   3459569   83  Linux
/dev/sda2           901      1016    445904   fd  Linux raid autodetect

Command (m for help):

    

Once the disk is accessible and has been partitioned as desired, it is necessary to ensure that the disk is accessible during IPL. To do this, a new initial ramdisk (often referred to as "initrd") file must be created. The mkinitrd command is used to do this:

# mkinitrd -f --with=zfcp /boot/initrd-2.4.21-9.EL.img-zfcp 2.4.21-9.EL

    

Depending on your system environment, you may need to modify the mkinitrd command to include additional modules. For example, the sample below includes the module supporting RAID level 0:

# mkinitrd -f --with=zfcp --with=raid0 /boot/initrd-2.4.21-9.EL.img-zfcp 2.4.21-9.EL

    

Next, change the ramdisk value in the zipl.conf file so that it points to your newly-created initrd file:

[defaultboot]
default=linux
target=/boot/
[linux]
        image=/boot/vmlinuz-2.4.21-9.EL
        ramdisk=/boot/initrd-2.4.21-9.EL.img-zfcp
        parameters="root=LABEL=/"

    

Finally, run zipl to install the bootloader:

# /sbin/zipl

    

When zipl is complete, verify the changes by performing an IPL.

The mdadm command may be new to readers of this document. However, like the various tools comprising the raidtools package, mdadm can be used to perform all the necessary functions related to administering multiple-device sets. In this section, we show how mdadm can be used to:

· Create a RAID device

· Create a multipath device

Creating a RAID Device With mdadm

To create a RAID device, edit the /etc/mdadm.conf file to define appropriate DEVICE and ARRAY values:

DEVICE /dev/sd[abcd]1
ARRAY /dev/md0 devices=/dev/sda1,/dev/sdb1,/dev/sdc1,/dev/sdd1

    

In this example, the DEVICE line is using traditional file name globbing (refer to the glob(7) man page for more information) to define the following SCSI devices:

· /dev/sda1

· /dev/sdb1

· /dev/sdc1

· /dev/sdd1

The ARRAY line defines a RAID device (/dev/md0) that is comprised of the SCSI devices defined by the DEVICE line.

Prior to the creation or usage of any RAID devices, the /proc/mdstat file shows no active RAID devices:

Personalities :
read_ahead not set
Event: 0
unused devices: <none>

    

Next, use the above configuration and the mdadm command to create a RAID 0 array:

mdadm -C /dev/md0 --level=raid0 --raid-devices=4 /dev/sda1 /dev/sdb1 /dev/sdc1 /dev/sdd1
Continue creating array? yes
mdadm: array /dev/md0 started.

    

Once created, the RAID device can be queried at any time to provide status information. The following example shows the output from the command mdadm --detail /dev/md0:

/dev/md0:
        Version : 00.90.00
  Creation Time : Mon Mar  1 13:49:10 2004
     Raid Level : raid0
     Array Size : 15621632 (14.90 GiB 15.100 GB)
   Raid Devices : 4
  Total Devices : 4
Preferred Minor : 0
    Persistence : Superblock is persistent

    Update Time : Mon Mar  1 13:49:10 2004
          State : dirty, no-errors
 Active Devices : 4
Working Devices : 4
 Failed Devices : 0
  Spare Devices : 0

     Chunk Size : 64K

    Number   Major   Minor   RaidDevice State
       0       8        1        0      active sync   /dev/sda1
       1       8       17        1      active sync   /dev/sdb1
       2       8       33        2      active sync   /dev/sdc1
       3       8       49        3      active sync   /dev/sdd1
           UUID : 25c0f2a1:e882dfc0:c0fe135e:6940d932
         Events : 0.1

    

Creating a Multipath Device With mdadm

In addition to creating RAID arrays, mdadm can also be used to take advantage of hardware supporting more than one I/O path to individual SCSI LUNs (disk drives). The goal of multipath storage is continued data availability in the event of hardware failure or individual path saturation. Because this configuration contains multiple paths (each acting as an independent virtual controller) accessing a common SCSI LUN (disk drive), the Linux kernel detects each shared drive once "through" each path. In other words, the SCSI LUN (disk drive) known as /dev/sda may also be accessible as /dev/sdb, /dev/sdc, and so on, depending on the specific configuration.

In order to provide a single device that can remain accessible if an I/O path fails or becomes saturated, mdadm includes an additional parameter to its --level option. This parameter — multipath — directs the md layer in the Linux kernel to re-route I/O requests from one pathway to another in the event of an I/O path failure.

To create a multipath device, edit the /etc/mdadm.conf file to define values for the DEVICE and ARRAY lines that reflect your hardware configuration.

The command used for the creation of a multipath device is similar to that used to create a RAID device; the difference is the replacement of a RAID level parameter with the multipath parameter:

mdadm -C /dev/md0 --level=multipath --raid-devices=4 /dev/sda1 /dev/sdb1 /dev/sdc1 /dev/sdd1
Continue creating array? yes
mdadm: array /dev/md0 started.

    

In this example, the hardware consists of one SCSI LUN presented as four separate SCSI devices, each accessing the same storage by a different pathway. Once the multipath device /dev/md0 is created, all I/O operations referencing /dev/md0 will be directed to /dev/sda1, /dev/sdb1, /dev/sdc1, or /dev/sdd1 (depending on which path is currently active and operational).

The configuration of /dev/md0 can be examined more closely using the command mdadm --detail /dev/md0 to verify that it is, in fact, a multipath device:

/dev/md0:
        Version : 00.90.00
  Creation Time : Tue Mar  2 10:56:37 2004
     Raid Level : multipath
     Array Size : 3905408 (3.72 GiB 3.100 GB)
   Raid Devices : 1
  Total Devices : 4
Preferred Minor : 0
    Persistence : Superblock is persistent

    Update Time : Tue Mar  2 10:56:37 2004
          State : dirty, no-errors
 Active Devices : 1
Working Devices : 4
 Failed Devices : 0
  Spare Devices : 3


    Number   Major   Minor   RaidDevice State
       0       8       49        0      active sync   /dev/sdd1
       1       8       17        1      spare   /dev/sdb1
       2       8       33        2      spare   /dev/sdc1
       3       8        1        3      spare   /dev/sda1
           UUID : 4b564608:fa01c716:550bd8ff:735d92dc
         Events : 0.1

    

Another feature of mdadm is the ability to force a device (be it a member of a RAID array or a path in a multipath configuration) to be removed from an operating configuration. In the following example, /dev/sda1 is flagged as being faulty, is then removed, and finally is added back into the configuration. For a multipath configuration, these actions would not impact any I/O activity taking place at the time:

# mdadm /dev/md0 -f /dev/sda1
mdadm: set /dev/sda1 faulty in /dev/md0
# mdadm /dev/md0 -r /dev/sda1
mdadm: hot removed /dev/sda1
# mdadm /dev/md0 -a /dev/sda1
mdadm: hot added /dev/sda1
#

    

Currently, Anaconda does not support direct installations of Red Hat Enterprise Linux 3 to SCSI devices. However, for those system administrators interested in the ability to IPL from a SCSI device, the following manual procedure can be used.

This procedure presents a step-by-step guide to migrating a Red Hat Enterprise Linux 3 Update 2 system environment (either as a z/VM guest or running in an LPAR) from an ECKD DASD installation to a SCSI disk installation. To do that, you must start with Red Hat Enterprise Linux 3 installed on an ECKD DASD. You must also have access to an empty SCSI disk.

(1) load the SCSI and zFCP device drivers

Login to your ECKD installation as root and load the corresponding device drivers to access your target SCSI disk

First, add the SCSI device driver:

# modprobe scsi_mod
    

Next, add the zfcp device driver and specify the parameters required to identify your SCSI disk.

· The device number of your zFCP adapter (0x5480)

· The WWPN (World Wide Port Name) of your storage device (0x5005076300cb93cb)

· The LUN (Logical Unit Number) of your SCSI disk (0x5123000000000000)

# modprobe zfcp loglevel="0x00000000" map="0x54800x1:0x5005076300cb93cb 0x0:0x5123000000000000"
    

Add the SCSI disk device driver:

# modprobe sd_mod
    

Make sure you are using the right SCSI disk. In the /proc/scsi/zfcp/map file there should be only one entry. If there is more than one entry, you must use the corresponding device node. In this example, it will be /dev/sda because it is the first one listed. However, if your SCSI disk is the second one listed, you must use /dev/sdb instead. Another possibility is to unload the three device drivers using the rmmod command. This removes all /proc/scsi/zfc/map entries; leaving you free to load them again with only one disk.

# cat /proc/scsi/zfcp/map
0x5480 0x1:0x5005076300cb93cb 0x0:0x5123000000000000
    

You should now detect your SCSI disk in the /proc/ file system:

# cat /proc/scsi/scsi
Attached devices:
Host: scsi0 Channel: 00 Id: 01 Lun: 00
  Vendor: IBM      Model: 2105F20          Rev: 2.91
  Type:   Direct-Access                    ANSI SCSI revision: 03
    

(2) Partitioning, formatting, and mounting

Using the fdisk command, create one partition on your SCSI disk.

(The following example shows the fdisk utility being used, although parted (a more sophisticated and flexible disk partitioning utility) could also be used.)

# fdisk /dev/sda

Command (m for help): p

Disk /dev/sda: 2000 MB, 2000027648 bytes
62 heads, 62 sectors/track, 1016 cylinders
Units = cylinders of 3844 * 512 = 1968128 bytes

   Device Boot    Start       End    Blocks   Id  System

Command (m for help): n
Command action
   e   extended
   p   primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-1016, default 1): <Enter>
Using default value 1
Last cylinder or +size or +sizeM or +sizeK (1-1016, default 1016): <Enter>
Using default value 1016

Command (m for help): p

Disk /dev/sda: 2000 MB, 2000027648 bytes
62 heads, 62 sectors/track, 1016 cylinders
Units = cylinders of 3844 * 512 = 1968128 bytes

   Device Boot    Start       End    Blocks   Id  System
/dev/sda1             1      1016   1952721   83  Linux

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.
Syncing disks.
    

Create an ext3 file system on the new partition using the mke2fs command. The -j option creates the journal, which makes an ext3 out of an ext2 file system.

# mke2fs -j /dev/sda1
mke2fs 1.32 (09-Nov-2002)
Filesystem label=
OS type: Linux
Block size=1024 (log=0)
Fragment size=1024 (log=0)
244736 inodes, 1952721 blocks
97636 blocks (5.00%) reserved for the super user
First data block=1
239 block groups
8192 blocks per group, 8192 fragments per group
1024 inodes per group
Superblock backups stored on blocks:
        8193, 24577, 40961, 57345, 73729, 204801, 221185, 401409, 663553,
        1024001

Writing inode tables: done
Creating journal (8192 blocks): done
Writing superblocks and filesystem accounting information: done

This filesystem will be automatically checked every 38 mounts or
180 days, whichever comes first.  Use tune2fs -c or -i to override.
    

Mount the newly-created file system on /mnt. You must specify the file system to the mount command by using the -t option.

# mount -t ext3 /dev/sda1 /mnt/
    

(3) Create the file structure

Next, you must create the same file structure as on your ECKD DASD. Start by creating a number of directories:

# cd /mnt/
# mkdir mnt proc tmp
# ls -l
total 15
drwx------    2 root     root        12288 Jan 30 13:38 lost+found
drwxr-xr-x    2 root     root         1024 Jan 30 13:41 mnt
drwxr-xr-x    2 root     root         1024 Jan 30 13:41 proc
drwxr-xr-x    2 root     root         1024 Jan 30 13:41 tmp
    

Next, copy all other files and directories to your SCSI disk.

# cp -r --no-dereference --preserve=all --target-directory=/mnt \
>  /bin /boot /dev /etc /home /initrd /lib /lib64 /misc /opt /root /sbin /usr /var
# ls
bin  boot  dev  etc  home  initrd  lib  lib64  lost+found  misc  mnt  opt
proc  root  sbin  tmp  usr  var
    

Next, change the permissions of the /tmp/ directory. Each user should be able to write to the /tmp/ directory, but each user should only be able to delete their own files and not the files of other users:

# chmod 1777 /mnt/tmp/
# ls -l /mnt/ | grep tmp
drwxrwxrwt    2 root     root         1024 Jan 30 13:41 tmp
    

(4) Edit configuration files

Edit your parameter file, and specify your new root file system. This should be your SCSI disk:

# cat /mnt/boot/parmfile.1
root=LABEL=/1
# vi /mnt/boot/parmfile.1
# cat /mnt/boot/parmfile.1
root=/dev/sda1
    

Edit the /etc/fstab file and change the root file system device to your SCSI disk (/dev/sda1, in our example). Since the /boot/ directory has also been copied to the SCSI disk, its line is no longer required:

# cat /mnt/etc/fstab
LABEL=/1                /                       ext3    defaults        1 1
LABEL=/boot1            /boot                   ext3    defaults        1 2
none                    /dev/pts                devpts  gid=5,mode=620  0 0
none                    /proc                   proc    defaults        0 0
/dev/dasda3             swap                    swap    defaults        0 0
# vi /mnt/etc/fstab
# cat /mnt/etc/fstab
/dev/sda1               /                       ext3    defaults        1 1
none                    /dev/pts                devpts  gid=5,mode=620  0 0
none                    /proc                   proc    defaults        0 0
    

Finally, it is necessary to add the mapping of the SCSI disk to the modules.conf configuration file. This mapping will be passed to the zfcp device driver while booting and is required to mount the SCSI root file system. Be careful and check for typos.

# cat /mnt/etc/modules.conf
alias eth0 qeth
options dasd_mod dasd=5c31
# vi /mnt/etc/modules.conf
# cat /mnt/etc/modules.conf
alias eth0 qeth
options dasd_mod dasd=5c31
options zfcp 'map="0x5480 0x1:0x5005076300cb93cb 0x0:0x5123000000000000"'
    

(5) Create a new ramdisk

Next, you must create a new ramdisk with the required device drivers. For example, the zfcp device driver is required in order to mount the root file system, which is on a SCSI disk. In other words, the zfcp driver module has to be loaded from the SCSI disk at some point in the boot process, but FCP is already needed to access this disk and to mount the root file system — a ramdisk resolves this apparent paradox.

In order to create the ramdisk for your mounted SCSI disk and not to overwrite your existing DASD ramdisk (in addition to using the edited modules.conf file and not the original ECKD DASD modules.conf) you must use a change-root (or chroot environment. By doing this, you will cause the /mnt/ directory to temporarily become the root directory:

# chroot /mnt/
    

One way to check that the proper chroot command was issued is to look for files in the /mnt/ directory. It should be empty, because /mnt/ now corresponds to the /mnt/ directory on your SCSI disk. The directories on your DASD are now longer accessible.

It is now time to build a new ramdisk using the following command:

# cd boot
# mkinitrd -v --with=scsi_mod --with=zfcp --with=sd_mod initrd-2.4.21-9.EL.scsi.img 2.4.21-9.EL
Looking for deps of module ide-disk
Looking for deps of module ext3 jbd
Looking for deps of module jbd
Looking for deps of module scsi_mod
Looking for deps of module zfcp scsi_mod qdio
Looking for deps of module scsi_mod
Looking for deps of module qdio
Looking for deps of module sd_mod       scsi_mod
Looking for deps of module scsi_mod
Using modules:  ./kernel/fs/jbd/jbd.o ./kernel/fs/ext3/ext3.o
./kernel/drivers/scsi/scsi_mod.o \
./kernel/drivers/s390/qdio.o ./kernel/drivers/s390/scsi/zfcp.o
./kernel/drivers/scsi/sd_mod.o
Using loopback device /dev/loop0
/sbin/nash -> /tmp/initrd.nUPsUg/bin/nash
/sbin/insmod.static -> /tmp/initrd.nUPsUg/bin/insmod
`/lib/modules/2.4.21-9.EL/./kernel/fs/jbd/jbd.o' ->
`/tmp/initrd.nUPsUg/lib/jbd.o'
`/lib/modules/2.4.21-9.EL/./kernel/fs/ext3/ext3.o' ->
`/tmp/initrd.nUPsUg/lib/ext3.o'
`/lib/modules/2.4.21-9.EL/./kernel/drivers/scsi/scsi_mod.o' ->
`/tmp/initrd.nUPsUg/lib/scsi_mod\
.o'
`/lib/modules/2.4.21-9.EL/./kernel/drivers/s390/qdio.o' ->
`/tmp/initrd.nUPsUg/lib/qdio.o'
`/lib/modules/2.4.21-9.EL/./kernel/drivers/s390/scsi/zfcp.o' ->
`/tmp/initrd.nUPsUg/lib/zfcp.o'
`/lib/modules/2.4.21-9.EL/./kernel/drivers/scsi/sd_mod.o' ->
`/tmp/initrd.nUPsUg/lib/sd_mod.o'
Loading module jbd
Loading module ext3
Loading module scsi_mod
Loading module qdio
Loading module zfcp with options 'map="0x5480 0x1:0x5005076300cb93cb 0x0:0x5123000000000000"'
Loading module sd_mod
    

Check the output of the mkinitrd and make sure the zfcp device driver is present and has the correct options (including the quotes) as shown in the example. If everything looks correct, you can now exit the chroot environment:

# exit
exit
    

(6) Make your SCSI disk bootable

The SCSI disk must be prepared with the zipl tool. In this example, the zipl command-line options are being used instead of the zipl configuration file.

# cd /mnt/boot/
# /root/s390-tools-1.2.4/zipl/src/zipl  -V -t . -i vmlinuz-2.4.21-9.EL -p parmfile.1 -r initrd-2.4.21-9.EL.scsi.img
Target device information
  Device..........................: 08:00
  Partition.......................: 08:01
  Device name.....................: sda
  Type............................: disk partition
  Disk layout.....................: SCSI
  Geometry - heads................: 62
  Geometry - sectors..............: 62
  Geometry - cylinders............: 1016
  Geometry - start................: 62
  File system block size..........: 1024
  Physical block size.............: 512
  Device size in physical blocks..: 3905442
Building bootmap './bootmap'
Adding IPL section
  kernel image......: vmlinuz-2.4.21-9.EL at 0x10000
  kernel parmline...: 'root=/dev/sda1 ' at 0x1000
  initial ramdisk...: initrd-2.4.21-9.EL.scsi.img at 0x800000
Preparing boot device: sda.
Detected SCSI PCBIOS disk layout.
Writing SCSI master boot record.
Syncing disks...
Done.
    

Note the references to SCSI in the output from the zipl command; this is one way to be sure that the issued command was correct.

(7) Clean-up

The process of preparing the SCSI disk is now complete. Unmount the SCSI disk and remove the device drivers, which are no longer needed. You can then shutdown your ECKD Linux environment:

# cd
# umount /mnt/
# rmmod sd_mod
# rmmod zfcp
# rmmod scsi_mod
# halt
    

(8) IPL

First, login to a CMS session and attach an FCP adapter to your VM guest:

att 5480 *
00: FCP 5480 ATTACHED TO LINUX17 5480
Ready; T=0.01/0.01 14:39:52
q v fcp
00: FCP  5480 ON FCP   5480 CHPID 50 SUBCHANNEL = 000E
00:      5480 QDIO-ELIGIBLE       QIOASSIST-ELIGIBLE
Ready; T=0.01/0.01 14:39:57
    

At this point the adapter is available; the other required parameters for SCSI IPL are specified next. This could be done using the new set loaddev CP command (z/VM 4.4). Note that there is a special syntax for this command. For example, there must be be a blank after the first 8 characters of a number. Refer to the z/VM documentation for details:

set loaddev port 50050763 00cb93cb lun 51230000 00000000
Ready; T=0.01/0.01 14:36:13
q loaddev
PORTNAME 50050763 00CB93CB    LUN  51230000 00000000    BOOTPROG 0
BR_LBA   00000000 00000000
Ready; T=0.01/0.01 14:36:17
    

The last step is to IPL, using the FCP adapter as parameter:

i 5480
00: HCPLDI2816I Acquiring the machine loader from the processor controller.
00: HCPLDI2817I Load completed from the processor controller.
00: HCPLDI2817I Now starting machine loader version 0001.
01: HCPGSP2630I The virtual machine is placed in CP mode due to a SIGP stop and store status from CPU 00.
02: HCPGSP2630I The virtual machine is placed in CP mode due to a SIGP stop and store status from CPU 00.
03: HCPGSP2630I The virtual machine is placed in CP mode due to a SIGP stop and store status from CPU 00.
00: MLOEVL012I: Machine loader up and running (version 0.13).
00: MLOPDM003I: Machine loader finished, moving data to final storage location.
Linux version 2.4.21-9.EL (bhcompile@rimmer.z900.redhat.com) (gcc version
3.2.3
20030502 (Red Hat Linux 3.2.3-26)) #1 SMP Thu Jan 8 17:26:32 EST 2004
We are running under VM (64 bit mode)
On node 0 totalpages: 65536
zone(0): 65536 pages.
zone(1): 0 pages.
zone(2): 0 pages.
Kernel command line: root=/dev/sda1
Highest subchannel number detected (hex) : 000E
Calibrating delay loop... 2241.33 BogoMIPS
Memory: 245936k/262144k available (2371k kernel code, 0k reserved, 1003k data, 3 20k init)
    

At this point, your Linux environment should come up properly. Finally, login to your Linux and conform that the root file system is, in fact, located on your SCSI disk:

          > ssh root@53v15g17
root@53v15g17's password: <password>
Last login: Mon Feb 16 14:37:16 2004
# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/sda1             1.9G  1.4G  387M  79% /
    

(9) Hints and Tips

A prepared SCSI disk cannot be SCSI IPL'd using a different adapter device number (devno) or WWPN. The reason is due to the fact that these parameters are on the ramdisk and will be used to mount the root file system. If the "original preparation path" is not available, once the SCSI IPL itself is complete your Linux environment will exit with a kernel panic. This is the same behavior as on ECKD DASDs.

Should you find yourself in this situation, the following steps may help you:

(a) Mount your SCSI disk to an ECKD DASD Linux to /mnt/

(b) Change the mapping in /mnt/etc/modules.conf (using the new devno and/or new WWPN)

(c) Re-build your ramdisk (making sure to use chroot and mkinitrd as described previously)

(d) Re-write your boot configuration to your SCSI disk (using the zipl step described previously)

This section contains information related to the Red Hat Enterprise Linux 3 Update 2 kernel.

This update includes bug fixes for a number of drivers. The more significant driver updates are listed below. In some cases, the original driver has been preserved under a different name, and is available as a non-default alternative for organizations that wish to migrate their driver configuration to the latest versions at a later time.

IBM ServeRAID (ips driver)

LSI Logic RAID (megaraid driver)

LSI Logic MPT Fusion (mpt* drivers)

Compaq SA53xx Controllers (cciss driver)

QLogic Fibre Channel (qla2xxx driver)

Intel PRO/1000 (e1000 driver)

Broadcom Tigon3 (tg3 driver)

Network Bonding (bonding driver)

Serial ATA (libata driver)

This section contains listings of packages that have been updated or added from Red Hat Enterprise Linux 3 as part of Update 2.

The following packages have been updated from the original release of Red Hat Enterprise Linux 3:

The following packages have been added to Red Hat Enterprise Linux 3 Update 2:

The following packages have been removed from Red Hat Enterprise Linux 3 Update 2: