Seagate ST34572WC Spezifikationen PDF herunterladen (Seite 13)

5. Removing the Disk

If you have a copy of the data on the failing disk, or you can move the data to another disk, you can choose to

remove the disk from the system instead of replacing it.

Removing a Mirror Copy from a Disk

If you have a mirror copy of the data already, you can stop LVM from using the copy on the failing disk by

reducing the number of mirrors. To remove the mirror copy from a specific disk, use lvreduce, and specify the

disk from which to remove the mirror copy. For example:

# lvreduce -m 0 -A n /dev/vgname/lvname pvname (if you have a single mirror copy)

# lvreduce -m 1 -A n /dev/vgname/lvname pvname (if you have two mirror copies)

The –A n option is used to prevent the lvreduce command from performing an automatic vgcfgbackup

operation, which could hang while accessing a defective disk.

If you have only a single mirror copy and want to maintain redundancy, create a second mirror of the data on a

different, functional disk, subject to the mirroring guidelines mentioned in

Preparing for Disk Recovery, before you

run lvreduce.

If the disk was not available at boot time (pvdisplay failed) then the lvreduce command fails with an error

that it could not query the physical volume. You can still remove the mirror copy, but you must specify the physical

volume

key

rather than the name. You can get the key using lvdisplay with the –k option as follows:

# lvdisplay -v –k /dev/vg00/lvol1

…

--- Logical extents ---

LE PV1 PE1 Status 1 PV2 PE2 Status 2

00000 0 00000 stale 1 00000 current

00001 0 00001 stale 1 00001 current

00002 0 00002 stale 1 00002 current

00003 0 00003 stale 1 00003 current

00004 0 00004 stale 1 00004 current

00005 0 00005 stale 1 00005 current

…

Compare this output with the output of lvdisplay without –k, which you did to check the mirror status. The

column that contained the failing disk (or ’???’) now holds the key. For this example, the key is 0. Use this key

with lvreduce as follows:

# lvreduce -m 0 -A n –k /dev/vgname/lvname key (if you have a single mirror copy)

# lvreduce -m 1 -A n –k /dev/vgname/lvname key (if you have two mirror copies)

Moving the Physical Extents to Another Disk

If the disk is marginal and you can still read from it, you can move the data onto another disk by moving the

physical extents onto another disk.

The pvmove command moves logical volumes or certain extents of a logical volume from one physical volume to

another. It is typically used to free up a disk—that is, to move all data from that physical volume so it can be

removed from the volume group. In its simplest invocation, you specify the disk to free up, and LVM moves all the

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Seagate ST34572WC Spezifikationen Seite 13