Seagate ST34572WC Especificaciones descargar pdf (Pagina 25)

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

resumes recovering any unattached failed disks in the volume group. Therefore, only run vgchange

after all work has been completed on all disks and paths in the volume group, and it is desirable to

attach them all.

Step 5: Restoring Lost Data to the Disk

This final step can be a straightforward resynchronization for mirrored configurations, or a recovery

of data from backup media.

 If a mirror of the root disk was replaced, initialize its boot information as follows:

– For an Integrity server, follow steps 5, 6, and 8 in Appendix D: Mirroring the Root Volume on

Integrity Servers.

– For a PA-RISC server, follow steps 4, 5, and 7 in Appendix D: Mirroring the Root Volume on PA-

RISC Servers.

 If all the data on the replaced disk was mirrored, you do not have to do anything; LVM

automatically synchronizes the data on the disk with the other mirror copies of the data.

 If the disk contained any unmirrored logical volumes (or mirrored logical volumes that did not have

a current copy on the system), restore the data from backup, mount the file systems, and restart any

applications you halted in step 1.

Replacing a LVM Disk in an HP Serviceguard Cluster Volume Group

Replacing LVM disks in an HP Serviceguard cluster follows the same procedure described in steps 1-

5, unless the volume group is shared. If the volume group is shared, make the following changes:

 When disabling LVM access to the disk, perform any online disk replacement steps individually on

each cluster node sharing the volume group. If you do not have LVM OLR, and you detach the disk,

you might need to make configuration changes that require you to deactivate the volume group on

all cluster nodes. However, if you have Shared LVM Single Node Online Volume Reconfiguration

(SNOR) installed, you can leave the volume group activated on one of the cluster nodes.

 When re-enabling LVM access, activate the physical volume on each cluster node sharing the

volume group.

Special care is required when performing a Serviceguard rolling upgrade. For details, see the LVM

Online Disk Replacement (LVM OLR) white paper.

Disk Replacement Scenarios

The following scenarios show several LVM disk replacement examples.

Scenario 1: Best Case

For this example, you have followed all the guidelines in Section 1: Preparing for Disk Recovery: all

disks are hot-swappable, all logical volumes are mirrored, and LVM OLR functionality is available on

the system. In this case, you can detach the disk using the pvchange command, replace it, reattach

it, and let LVM mirroring synchronize the logical volumes, all while the system remains up.

For this example, you assume that the bad disk is at hardware path 2/0/7.15.0 and has device

special files named /dev/rdsk/c2t15d0 and /dev/dsk/c2t15d0.

Check that the disk is not in the root volume group, and that all logical volumes on the bad disk are

mirrored with a current copy available. Enter the following commands:

# lvlnboot –v

Boot Definitions for Volume Group /dev/vg00:

Physical Volumes belonging in Root Volume Group:

/dev/dsk/c0t5d0 (0/0/0/3/0.5.0) -- Boot Disk

Boot: lvol1 on: /dev/dsk/c0t5d0

Root: lvol3 on: /dev/dsk/c0t5d0

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