Siemens SX Series User's Guide download pdf (Page 228)

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228 U41272-J-Z385-3-76

Mirroring of internal disks in X2000 Global X2000 functions

9.2.2 Error situations

9.2.2.1 Replacing a defective disk

After a defective disk is replaced by the service engineer the disk must be logically removed

from the mirror configuration then added to it again (see page 227).

9.2.2.2 Disk failure

2-disk configuration

A 2-disk configuration will survive the failure of one disk. The error in current operation can

be eliminated by replacing the defective disk (see previous section).

If a boot/reboot is carried out after a disk failure, the boot is rejected because the “Solistice-

DiskSuite” rule (more than half of all metadatabase devices) has been broken.

In such a case the system administrator must log on in the single-user mode and delete the

metadatabase devices of the defective disk.

The defective device is determined with the command metadb.

The metadatabase of the defective disk c0t0d0 in the example here, can then be deleted

with the command, e.g. metadb -f -d /dev/dsk/c0t0d0s7.

The system can then be started with the remaining disk with the command reboot.

The system administrator can prevent these actions by deactivating the defective

disk using the PRIMEPOWER ServerView in the mirror configuration before a

reboot.

3-disk configuration

A 3-disk configuration will survive the failure of one disk. A reboot is also possible if this error

occurs.

If a second disk fails (double error), the system operation is interrupted by a panic and the

system starts in single-user mode. Here too the defective metadata devices can be deleted

with the commands described above and the system can then started up with a disk by

means of reboot.

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