Seagate ST34572WC Specifications download pdf (Page 18)

Step 2: Replacing the Faulty Disk

If the disk is hot-swappable, you can replace it without powering down the system. Otherwise, power down the

system before replacing the disk. For the hardware details on how to replace the disk, refer to the hardware

administrator’s guide for the system or disk array.

If you powered down the system, reboot it normally. The only exception is if you replaced a disk in the root

volume group.

• If you replaced the disk that you normally boot from, the replacement disk will not contain the information

needed by the boot loader. If your root disk is mirrored, boot from it by using the alternate boot path. If

the root disk was not mirrored, you have no recourse but to reinstall or recover your system.

• If there are only two disks in the root volume group, the system will probably fail its quorum check, and

might panic early in the boot process with the message “panic: LVM: Configuration failure”.

In this situation, you must override quorum to boot successfully. Do this by interrupting the boot process

and adding the option –lq to the boot command normally used by the system. Boot process and options

are discussed in Chapter 5 of

Managing Systems and Workgroups.

Step 3: Initializing the Disk for LVM

This step copies LVM configuration information onto the disk, and marks it as owned by LVM so it can

subsequently be attached to the volume group.

If you replaced a mirror of the root disk on an Integrity server, run the idisk command as described in step 1 of

Appendix A: Mirroring the Root Volume on Integrity Servers. For PA-RISC servers or non-root disks, this step is

unnecessary.

For any replaced disk, restore LVM configuration information to the disk using the vgcfgrestore command as

follows:

# vgcfgrestore –n vgname pvname

Step 4: Re-enabling LVM Access to the Disk

This is known as attaching the disk. The action you take here depends on whether LVM OLR is available.

• If you have LVM OLR, attach the device using the –a option with the pvchange command as follows:

# pvchange -a y pvname

After LVM processes the pvchange command, it resumes using the device if possible.

• If you do not have LVM OLR, or you want to ensure that any alternate links are attached, use the

vgchange command to activate the volume group and bring any detached devices online:

# vgchange -a y vgname

The vgchange command attaches all paths for all disks in the volume group, and resumes automatically

recovering any unattached failed disks in the volume group. Therefore, run vgchange only after all work

has been completed on all disks and paths in the volume group, and it is desirable to attach them all.

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Seagate ST34572WC Specifications Page 18