Seagate ST34572WC Especificaciones descargar pdf (Pagina 12)

3. Confirming Disk Failure

Once you suspect a disk has failed or is failing, make certain that the suspect disk is indeed failing.

Replacing or removing the incorrect disk makes the recovery process take longer. It can even cause

data loss. For example, in a mirrored configuration, if you were to replace the wrong disk—the one

holding the current good copy rather than the failing disk—the mirrored data on the good disk is lost.

It is also possible that the suspect disk is not failing. What seems to be a disk failure might be a

hardware path failure; that is, the I/O card or cable might have failed. If a disk has multiple

hardware paths, also known as pvlinks, one path can fail while an alternate path continues to work.

For such disks, try the following steps on all paths to the disk.

If you have isolated a suspect disk, you can use hardware diagnostic tools, like Support Tools

Manager, to get detailed information about it. Use these tools as your first approach to confirm disk

failure. They are documented on docs.hp.com in the diagnostics area. If you do not have diagnostic

tools available, follow these steps to confirm that a disk has failed or is failing:

1. Use the ioscan command to check the S/W state of the disk. Only disks in state CLAIMED are

currently accessible by the system. Disks in other states such as NO_HW or disks that are

completely missing from the ioscan output are suspicious. If the disk is marked as CLAIMED, its

controller is responding. For example:

# ioscan –fCdisk

Class I H/W Path Driver S/W State H/W Type Description

===================================================================

disk 0 8/4.5.0 sdisk CLAIMED DEVICE SEAGATE ST34572WC

disk 1 8/4.8.0 sdisk UNCLAIMED UNKNOWN SEAGATE ST34572WC

disk 2 8/16/5.2.0 sdisk CLAIMED DEVICE TOSHIBA CD-ROM XM-5401TA

In this example, the disk at hardware path 8/4.8.0 is not accessible.

If the disk has multiple hardware paths, be sure to check all the paths.

4. You can use the pvdisplay command to check whether the disk is attached or not. A physical

volume is considered to be attached, if the pvdisplay command is able to report a valid status

(unavailable/available) for it. Otherwise, the disk is unattached. In that case, the disk was

defective or inaccessible at the time the volume group was activated. For example, if

/dev/dsk/c0t5d0 is a path to a physical volume that is attached to LVM, enter:

# pvdisplay /dev/dsk/c0t5d0 | grep “PV Status”

PV Status available

If /dev/dsk/c1t2d3 is a path to a physical volume that is detached from LVM access using a

pvchange –a n or pvchange –a N command, enter:

# pvdisplay /dev/dsk/c1t2d3 | grep “PV Status”

PV Status unavailable

If the disk responds to the ioscan command, test it with the diskinfo command. The reported

size must be nonzero; otherwise, the device is not ready. For example:

# diskinfo /dev/rdsk/c0t5d0

SCSI describe of /dev/rdsk/c0t5d0:

vendor: SEAGATE

product id: ST34572WC

type: direct access

size: 0 Kbytes

bytes per sector: 512

In this example the size is 0, so the disk is malfunctioning.

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