Seagate ST34572WC Especificaciones descargar pdf (Pagina 9)

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

http://docs.hp.com in the diagnostics area. If you do not have diagnostic tools available, use the following

three-step approach 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, then 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.

2. 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.

3. If both ioscan and diskinfo succeed, the disk might still be failing. As a final test, try to read from the disk

using the dd command. Depending on the size of the disk, a comprehensive read can be time-consuming, so

you might want to read only a portion of the disk. If the disk is functioning properly, no I/O errors are

reported.

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Seagate ST34572WC Especificaciones Pagina 9