HOWTOs

5. Appendix A. - example raidtab

RAID1 example described in the first sections of this document

 df
Filesystem           1k-blocks      Used Available Use% Mounted on
/dev/md0              19510780   1763188  16756484  10% /
/dev/md1                 15860       984     14051   7% /boot

# --------------------------

 fdisk -ul /dev/hda

Disk /dev/hda: 16 heads, 63 sectors, 39770 cylinders
Units = sectors of 1 * 512 bytes

   Device Boot    Start       End    Blocks   Id  System
/dev/hda1            63     33263     16600+  fd  Linux raid autodetect
/dev/hda2         33264    443519    205128   83  Linux native
/dev/hda3        443520  40088159  19822320   fd  Linux raid autodetect

# --------------------------

 fdisk -ul /dev/hdc

Disk /dev/hdc: 16 heads, 63 sectors, 39770 cylinders
Units = sectors of 1 * 512 bytes

   Device Boot    Start       End    Blocks   Id  System
/dev/hdc1            63     33263     16600+  fd  Linux raid autodetect
/dev/hdc2         33264    443519    205128   82  Linux swap
/dev/hdc3        443520  40088159  19822320   fd  Linux raid autodetect

# --------------------------

# md0 is the root array, about 20 gigs
raiddev                 /dev/md0
raid-level              1
nr-raid-disks           2
chunk-size              32
# Spare disks for hot reconstruction
nr-spare-disks          0
persistent-superblock   1
device                  /dev/hda3
raid-disk               0
device                  /dev/hdc3
raid-disk               1

# md1 is the /boot array, about 16 megs
raiddev                 /dev/md1
raid-level              1
nr-raid-disks           2
chunk-size              32
# Spare disks for hot reconstruction
nr-spare-disks          0
persistent-superblock   1
device                  /dev/hda1
raid-disk               0
device                  /dev/hdc1
raid-disk               1

# --------------------------

# GLOBAL SECTION
# device containing /boot directory
disk=/dev/md0
# geometry
  bios=0x80
  sectors=63
  heads=16
  cylinders=39770
# dummy
  partition=/dev/md1
# start of device "disk" above
  start=63

boot=/dev/hda
map=/boot/map
install=/boot/boot.b

image=/boot/bzImage
root=/dev/md0
label=LinuxRaid
read-only

# -------------------------

# GLOBAL SECTION
# device containing /boot directory
disk=/dev/md0
# geometry
  bios=0x80
  sectors=63
  heads=16
  cylinders=39770
# dummy
  partition=/dev/md1
# start of device "disk" above
  start=63

boot=/dev/hdc
map=/boot/map
install=/boot/boot.b

image=/boot/bzImage
root=/dev/md0
label=LinuxRaid
read-only