Dell Software RAID with Red Hat Enterprise Linux4 Manuel d'utilisateur télécharger pdf (Page 8)

6 Software RAID with Red Hat Enterprise Linux 4

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Restoring the RAID Configuration After a Drive Failure

When a hard drive in a software RAID 1 array fails, you can restore the RAID array onto a new drive

by following a three-step process:

• Replacing the failed drive

• Partitioning the replacement drive

• Adding RAID partitions back into the md devices

If you suspect a drive failure, you can check the status of each RAID device by using the

following command:

cat /proc/mdstat

For example, a system missing a partition from the md0 device would show the following:

md0 : active raid1 sda1[0]

104320 blocks [2/1] [U_]

This output indicates that

md0

is active as a RAID 1 device and that partition

sda1

is currently

active in that RAID device. The output [

2/1

] denotes that two partitions should be available to

the device (the first value), but only one is currently available (the second value). The output [

]

shows that the first partition is available (denoted by the letter "U") and the second partition is

offline (denoted by the underscore).

Replacing a Failed Disk Drive

Once a hard disk drive fails, replace it immediately to preserve the data redundancy that

RAID1provides.

See your system documentation for instructions on replacing your failed hard drive with a

new hard drive.

Partitioning the Replacement Drive

Once the failed disk drive has been replaced, restore the partitions that were saved earlier in

the

/raidinfo

directory.

For replacing drive

sda,

restore the original partition scheme for

sda

to the new hard drive

by typing:

sfdisk /dev/sda < /raidinfo/partitions.sda

For replacing drive

sdb,

restore the original partition scheme for

sdb

to the new hard drive

by typing:

sfdisk /dev/sdb < /raidinfo/partitions.sdb

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 57 58

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Dell Software RAID with Red Hat Enterprise Linux4 Manuel d'utilisateur Page 8

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