HP 8 Internal Port SAS Controller and HP Multi-Port Internal SAS Controller Support Guide, September 2009

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io_redirect_dsf(1M) manpage. To view the manpage, enter this command: man 1m

io_redirect_dsf

WARNING! If you shut down a server to replace a failed disk offline, the DSF of the failed disk

will not be visible in ioscan when the server restarts. The DSF is required by the replace_tgt

command to rebuild the array with the new disk.

Before you shut down the server, run ioscan and make note of the DSF information for the

failed disk.

WARNING! The sasmgr replace_tgt and io_redirect_dsf(1M) commands must only

be used between identical device types: an IR volume must be replaced by an IR volume, and a

non-IR volume must be replaced by a non-IR volume. If you use these commands to remap DSFs

for different device types, data loss can occur.

To replace a disk online, follow these steps:

1. Use ioscan -fnkC disk to display the list of disk devices, and note the DSF of the failed

disk:

# ioscan -fnkC disk

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

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

disk 0 0/0/2/1.0.16.0.0 sdisk CLAIMED DEVICE TEAC N

/dev/dsk/c0t0d0 /dev/rdsk/c0t0d0

disk 1 0/4/1/0.0.0.0.0 sdisk CLAIMED DEVICE HP 4

/dev/dsk/c3t0d0 /dev/rdsk/c3t0d0

disk 3 0/4/1/0.0.0.2.0 sdisk NO_HW DEVICE HP 4

/dev/dsk/c3t2d0 /dev/rdsk/c3t2d0

disk 4 0/4/1/0.0.0.3.0 sdisk CLAIMED DEVICE HP 4

/dev/dsk/c3t3d0 /dev/rdsk/c3t3d0

disk 5 0/4/1/0.0.0.4.0 sdisk CLAIMED DEVICE HP 4

/dev/dsk/c3t4d0 /dev/rdsk/c3t4d0

disk 6 0/4/1/0.0.0.5.0 sdisk CLAIMED DEVICE HP e

/dev/dsk/c3t5d0 /dev/rdsk/c3t5d0

/dev/dsk/c3t5d0s1 /dev/rdsk/c3t5d0s1

/dev/dsk/c3t5d0s2 /dev/rdsk/c3t5d0s2

/dev/dsk/c3t5d0s3 /dev/rdsk/c3t5d0s

When the disk is removed, or if it has completely failed, the S/W state will change to NO_HW.

In this example, the failed disk is /dev/dsk/c3t2d0 and its hardware path is

0/4/1/0.0.0.2.0.

2. Replace the disk. A new device path and device files are assigned to the replacement disk.

3. Use ioscan -fnC disk to display the list of disk devices, and make note of the hardware

path of the replacement disk:

# ioscan -fnC disk