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Chapter 2. Planning 11
DASD versus SCSI/FCP
This book describes how to use conventional ECKD DASD and does not discuss FBA disks
accessed over SCSI/FCP. This is not because either technology is superior, but simply
because DASD seems to be much more common than SCSI/FCP disks. If you were to use
SCSI/FCP disks, cloning using the clone.sh script would have to be modified to account for
World Wide Port Names and Numbers.
Sometimes a combination of these two types of disk storage is used; in that case the ECKD
emulated DASD is often used for the root file system and SCSI/FCP disks are used for large
data storage areas.
3390-3s versus 3390-9s
Emulated 3390-3s format to about 2.3 GB. In contrast, 3390-9s are three times the size, or
about 6.8 GB. Either size will work, although 3390-3s have been recommended over 3390-9s
by some performance analysts.
This book describes mainly using 3390-3s; however, comments are added where using
3390-9s differs, especially with installing z/VM.
Disk storage per Linux image
Disk storage has the following characteristics
This version of the book recommends using two 3390-3 DASD to create minidisks at
virtual addresses 100 and 101. Previous versions only recommended a single minidisk at
virtual address 100.
The root file system is on /dev/dasda1 with a recommended size of 384 MB. It is not a
logical volume so that if there are any problems with LVM, the system will still be able to
boot.
Other file systems are on logical volumes that are part of a single volume group with the
characteristics listed in Table 2-1.
Table 2-1 Recommended logical volume file systems and sizes
This layout uses about 3.5 GB out of 4.5 GB of disk space. You could choose to use disk sizes
other than 3338 cylinders (3390-3 minus cylinder 0). For example, if you chose to use
3390-9s, you could give 100 and 101 each half of the volume, giving each Linux about 6.8 GB
of disk space.
Mount point Logical volume name Size
/usr/ usr-lv 2 GB
/var/ var-lv 512 MB
/opt/ opt-lv 384 MB
/tmp/ tmp-lv 384 MB
Important: However you choose to lay out the minidisks, it is important that the golden
image and all target Linux user IDs have two minidisks of the same size at virtual
addresses 100 and 101. These assumptions are coded into the clone.sh script.
- The Virtualization Cookbook 1
- Linux 5.2 3
- October 2008 3
- First Edition (October 2008) 4
- Contents 5
- Contents v 7
- Contents vii 9
- Trademarks 12
- The team that wrote this book 13
- Chapters and appendixes 15
- Conventions 17
- Comments welcome 17
- 1.1 What is virtualization 20
- 1.2 This book’s approach 21
- 1.4 Infrastructure design 22
- Planning 25
- 2.1 Bill of materials 26
- 2.2 z/VM conventions 27
- 2.3 Disk planning 28
- DASD versus SCSI/FCP 29
- 3390-3s versus 3390-9s 29
- Disk storage per Linux image 29
- 2.4 Memory planning 30
- 2.5 Password planning 30
- 2.6 Planning worksheets 31
- 2.7 Blank worksheets 34
- 2.7.2 z/VM DASD worksheet 35
- Configuring a desktop machine 37
- Figure 3-2 Setting logging 39
- Saving sessions 41
- 3.2 Setting up a VNC client 42
- 3.3 3270 emulators 43
- 4.1 Installing z/VM from DVD 46
- ==> instplan 50
- Running INSTDVD 52
- Figure 4-8 Load window 53
- ==> cold drain noautolog 54
- ==> no 54
- ==> disc 54
- 4.2 Configuring TCP/IP 56
- not specified 62
- 4.6 Adding paging volumes 65
- Using the CPFORMAT EXEC 67
- 4.6.4 Testing the changes 71
- 4.8.2 Testing the changes 78
- 4.9.1 VM security products 79
- ==> sampnss cms 86
- Servicing z/VM 89
- 5.1 Applying a PTF 90
- 6.4 Enabling the NFS server 106
- 7.2.3 Configuring VDISK swap 128
- 7.2.4 Configuring yum 128
- 7.2.5 Adding additional RPMs 129
- 7.2.10 Configuring SSH keys 134
- 4 6763) is running 135
- 8.2.4 Adding additional RPMs 145
- 8.2.8 Configuring SSH keys 145
- 8.2.9 Rebooting the system 146
- 8.2.10 Verifying the changes 146
- Detach the source disks 151
- Detach the target disks 154
- IPL the target system 154
- 9.3.2 Using the clone script 157
- FLASHCOPY 159
- Installation Server 159
- Master Image 159
- 9.5 Reviewing system status 163
- LNXMAINT 164
- Delete these 167
- Servicing Linux with Red Hat 171
- 12.1.2 Testing Apache 179
- 12.1.3 Turning on a firewall 179
- 12.1.6 Apache resources 182
- Start the LDAP service 184
- Deleting duplicate users 186
- Set a password 189
- 12.3.4 Adding a Samba user 191
- 12.3.6 Testing your changes 192
- 12.3.7 Configuring printing 193
- 12.4.1 Additional resources 194
- Linux kernel development 195
- Web development 195
- Miscellaneous recipes 197
- 13.1 Adding a logical volume 198
- Volume Group - optvg 200
- Creating a physical volume 204
- Extending the volume group 204
- /var/lib/ldap 205
- Configuring LDAP 206
- Configuring automount 207
- 13.4 Rescuing a Linux system 208
- Monitoring z/VM and Linux 211
- INIDICATE LOAD 212
- INDICATE QUEUES EXP 213
- Getting help 214
- Determining who is logged on 214
- Determining storage or memory 215
- Determining software level 215
- 14.2.3 Configuring PERFSVM 218
- Using a Web browser interface 220
- Using a 3270 interface 222
- 14.3 Monitoring Linux 223
- PURGE NSS NAME MONDCSS 228
- CP SAVESEG MONDCSS 228
- References 229
- Quick reference sheets 230
- Prefix commands 231
- :help give help 232
- Appendix B. z/VM source code 233
- The CPFORMAT EXEC 234
- The CHPW540 XEDIT macro 238
- The LABEL540 EXEC 241
- The LABEL540 XEDIT macro 243
- Linux source code 245
- Related publications 257
- Online resources 258
- How to get Redbooks 258
- Help from IBM 258
- Hat Enterprise Linux 5.2 265
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