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Create a RAID device
Create a multipath device
22.3.1. Creat ing a RAID Device Wit h 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
Chapt er 2 2 . Addit ional Informat ion for IBM Syst em z Users
227
- Red Hat Enterprise Linux 5 1
- Installation Guide 1
- Edited by 3
- Legal Notice 4
- Abstract 4
- Table of Contents 5
- 2.1. Upgrade or Inst all? 13
- 4.4.3.1 . Ke rne l Opt io ns 31
- 4.9. Inst alling via NFS 34
- 4.10. Inst alling via FTP 35
- 4.13. Language Select ion 38
- 4.18. Creat e Default Layout 45
- 4 .19.3. Part it ion Fields 49
- 4 .19.5. Adding Part it ions 52
- 4.21. Net work Configurat ion 60
- 4.23. Set Root Password 64
- 4.25. Preparing t o Inst all 68
- 4.26. Inst alling Packages 68
- Shell> type elilo.conf 70
- 6.3.4 . Using Remaining Space 76
- 9.2. GRUB 99
- 9.3. Inst alling GRUB 100
- 9.4. GRUB T erminology 101
- 0+50,100+25,200+1 102
- 9.6. GRUB Commands 104
- 9.9. Addit ional Resources 108
- 11.1. Upgrade or Inst all? 112
- linux mediacheck 113
- 12.4. Using t he HMC vt erm 119
- 12.9. Inst alling via NFS 124
- 12.10. Inst alling via FT P 125
- 12.11. Inst alling via HT T P 126
- 12.13. Language Select ion 128
- Important — multipath devices 133
- 12.19.3. Part it ion Fields 139
- 12.19.5. Adding Part it ions 141
- 12.22. Set Root Password 147
- 12.25. Inst alling Packages 151
- SATA and SCSI 155
- Advanced procedure 160
- id:5:initdefault: 171
- 16.1. Pre-Inst allat ion 177
- 16.6. Inst alling under z/VM 180
- Syst em z CD-ROMs 186
- 17.5. Inst alling via NFS 191
- 17.6. Inst alling via FTP 192
- 17.7. Inst alling via HT TP 193
- 17.9. Language Select ion 195
- 17.14 .3. Part it ion Fields 205
- 17.17. Set Root Password 209
- 17.19. Preparing t o Inst all 213
- 17.20. Inst alling Packages 213
- DNS=10.0.0.1:10.0.0.2 218
- /sbin/init 5 225
- 22.1. The sysfs File Syst em 227
- 22.2. Using t he zFCP Driver 227
- 22.4 .1. IPL t he SCSI Disk 233
- 22.5. Adding DASD 234
- 22.6.1. Adding a qeth Device 238
- Part IV. Common Tasks 247
- $ rpm -qa 248
- 24 .2. Upgrading Your Syst em 252
- Important 255
- 27.1. Common Problems 270
- Rescue Mode 275
- 29.2.1. Overview of LUKS 277
- St art up) 278
- Inst allat ion 279
- 29 .5 .1.1. Generat e a key 282
- 30.1. VNC Viewer 283
- 30.2. VNC Modes in Anaconda 283
- 30.4. References 286
- 31.4. Kickst art Opt ions 288
- # Raid 1 IDE config 308
- 31.6.1. Example 312
- %include /tmp/part-include 313
- %post --nochroot 313
- <ip-addr>-kickstart 315
- 32.1. Basic Configurat ion 322
- 32.2. Inst allat ion Met hod 323
- 32.3. Boot Loader Opt ions 325
- 32.5. Net work Configurat ion 330
- 32.6. Aut hent icat ion 331
- 32.7. Firewall Configurat ion 332
- 32.8. Display Configurat ion 333
- 32.8.1. General 334
- 32.8.2. Video Card 334
- 32.8.3. Monit or 335
- 32.9. Package Select ion 336
- 32.11.1. Chroot Environment 340
- 32.12. Saving t he File 341
- 33.1. The Boot Process 343
- 33.2.2. T he Boot Loader 344
- 33.2.3. T he Kernel 345
- 33.4. SysV Init Runlevels 348
- 33.4 .2. Runlevel Ut ilit ies 349
- 33.5. Shut t ing Down 350
- 34 .3. Adding PXE Host s 352
- 34 .4. T FT PD 354
- Revision History 356
- Revision Hist ory 357
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