Disk Replacement - Integrity (Itanium) - SAS Disk Replacement

Disk Replacement - Integrity (Itanium) - SAS Disk Replacement

Please follow these instructions. In this example, the failed drive is c1t4d0 and it's corresponding SAS controller name sasd0:

1.  Check current configuration state:

# ioscan -fnH 0/4/1/0 Class        I  H/W Path        Driver    S/W State   H/W Type     Description =============================================================================== escsi_ctlr   0  0/4/1/0         sasd      CLAIMED     INTERFACE    HP  PCI/PCI-X SAS MPT Adapter                                /dev/sasd0 ext_bus      1  0/4/1/0.0.0     sasd_vbus CLAIMED     INTERFACE    SAS Device Interface target       4  0/4/1/0.0.0.4   tgt       NO_HW       DEVICE disk         5  0/4/1/0.0.0.4.0   sdisk     NO_HW       DEVICE       HP      DG036A8B5B                                /dev/dsk/c1t4d0     /dev/rdsk/c1t4d0                                /dev/dsk/c1t4d0s1   /dev/rdsk/c1t4d0s1                                /dev/dsk/c1t4d0s2   /dev/rdsk/c1t4d0s2                                /dev/dsk/c1t4d0s3   /dev/rdsk/c1t4d0s3 target       5  0/4/1/0.0.0.7   tgt       CLAIMED     DEVICE disk         8  0/4/1/0.0.0.7.0   sdisk     CLAIMED     DEVICE       HP      DG036A9BB6                                /dev/dsk/c1t7d0     /dev/rdsk/c1t7d0                                /dev/dsk/c1t7d0s1   /dev/rdsk/c1t7d0s1                                /dev/dsk/c1t7d0s2   /dev/rdsk/c1t7d0s2                                /dev/dsk/c1t7d0s3   /dev/rdsk/c1t7d0s3

Note: It's important to save also the output of "sasmgr get_info -D /dev/sasd# -q raid=all", this way you can compare the original disk with the replacement disk using the bay number, since the target id will always change and can't be used as a comparison strategy when replacing SAS disks.

2.  If the physical volume is part of an existing volume group, temporaly disable LVM I/O to the drive:

# pvchange -a n /dev/dsk/c1t4d0

3.  Turn on the disk’s locator LED to ensure the remove the correct disk from the sas bay.

# sasmgr set_attr -D /dev/sasd0 -q lun=/dev/rdsk/c1t4d0 -q locate_led=on Verify that only the failed drive locate LED is set to ON. # sasmgr get_info -D /dev/sasd0 -q lun=all -q lun_locate /dev/rdsk/c1t2d0          0/4/1/0.0.0.2.0           1     3     OFF /dev/rdsk/c1t3d0          0/4/1/0.0.0.3.0           1     4     OFF /dev/rdsk/c1t4d0          0/4/1/0.0.0.4.0           1     5     ON /dev/rdsk/c1t7d0          0/4/1/0.0.0.7.0           1     8     OFF RAID VOL ID is 4 : /dev/rdsk/c1t10d0         0/4/1/0.0.0.10.0 Physical disks in volume are :         1     1     OFF           HP            DG072A9BB7         HPD0         1     2     OFF           HP            DG072A9BB7         HPD0

4.  At this point the drive in bay 5 can be physically remove and replace with the new drive.

5.  Running ioscan again will output the new disk HW path, 0/4/1/0.0.0.11.0 in this example. Failed drive will still show NO_HW. This behavior is normal:

# ioscan -fnH 0/4/1/0 Class        I  H/W Path        Driver    S/W State   H/W Type     Description =============================================================================== escsi_ctlr   0  0/4/1/0         sasd      CLAIMED     INTERFACE    HP  PCI/PCI-X SAS MPT Adapter                                /dev/sasd0 ext_bus      1  0/4/1/0.0.0     sasd_vbus CLAIMED     INTERFACE    SAS Device Interface target       4  0/4/1/0.0.0.4   tgt       NO_HW       DEVICE disk         5  0/4/1/0.0.0.4.0   sdisk     NO_HW       DEVICE       HP      DG036A8B5B                                /dev/dsk/c1t4d0     /dev/rdsk/c1t4d0                                /dev/dsk/c1t4d0s1   /dev/rdsk/c1t4d0s1                                /dev/dsk/c1t4d0s2   /dev/rdsk/c1t4d0s2                                /dev/dsk/c1t4d0s3   /dev/rdsk/c1t4d0s3 target       5  0/4/1/0.0.0.7   tgt       CLAIMED     DEVICE disk         8  0/4/1/0.0.0.7.0   sdisk     CLAIMED     DEVICE       HP      DG036A9BB6                                /dev/dsk/c1t7d0     /dev/rdsk/c1t7d0                                /dev/dsk/c1t7d0s1   /dev/rdsk/c1t7d0s1                                /dev/dsk/c1t7d0s2   /dev/rdsk/c1t7d0s2                                /dev/dsk/c1t7d0s3   /dev/rdsk/c1t7d0s3 target       7  0/4/1/0.0.0.11  tgt       CLAIMED     DEVICE disk        12  0/4/1/0.0.0.11.0  sdisk     CLAIMED     DEVICE       HP      DG036A8B5B

6.  The new disk will use a different SAS address (Similar to WWN on fibre channel connections). The old device special file name must be redirected to the new HW path. Issue the following command to update the configuration:

# sasmgr replace_tgt -D /dev/sasd0 -q old_dev=/dev/dsk/c1t4d0 -q new_tgt_hwpath=0/4/1/0.0.0.11.0 WARNING: This is a DESTRUCTIVE operation. This might result in failure of current I/O requests. Do you want to continue ?(y/n) [n]... LUN has been replaced with new Target.

7.  Verify the system state with ioscan:

# ioscan -fnH 0/4/1/0 Class        I  H/W Path        Driver    S/W State   H/W Type     Description =============================================================================== escsi_ctlr   0  0/4/1/0         sasd      CLAIMED     INTERFACE    HP  PCI/PCI-X SAS MPT Adapter                                /dev/sasd0 ext_bus      1  0/4/1/0.0.0     sasd_vbus CLAIMED     INTERFACE    SAS Device Interface target       4  0/4/1/0.0.0.4   tgt       CLAIMED       DEVICE disk         5  0/4/1/0.0.0.4.0   sdisk     CLAIMED       DEVICE       HP      DG036A8B5B                                /dev/dsk/c1t4d0     /dev/rdsk/c1t4d0                                /dev/dsk/c1t4d0s1   /dev/rdsk/c1t4d0s1                                /dev/dsk/c1t4d0s2   /dev/rdsk/c1t4d0s2                                /dev/dsk/c1t4d0s3   /dev/rdsk/c1t4d0s3 target       5  0/4/1/0.0.0.7   tgt       CLAIMED     DEVICE disk         8  0/4/1/0.0.0.7.0   sdisk     CLAIMED     DEVICE       HP      DG036A9BB6                                /dev/dsk/c1t7d0     /dev/rdsk/c1t7d0                                /dev/dsk/c1t7d0s1   /dev/rdsk/c1t7d0s1                                /dev/dsk/c1t7d0s2   /dev/rdsk/c1t7d0s2                                /dev/dsk/c1t7d0s3   /dev/rdsk/c1t7d0s3 target       7  0/4/1/0.0.0.11  tgt       NO_HW     DEVICE disk        12  0/4/1/0.0.0.11.0  sdisk     NO_HW     DEVICE       HP      DG036A8B5B

Note: The S/W State of the H/W Path 0/4/1/0.0.0.4.0 changed to CLAIMED, and the S/W State of the H/W Path 0/4/1/0.0.0.11.0 changed to NO_H/W. The hardware path 0/4/1/0.0.0.11.0 will remain as NO_HW in the ioscan output until the system next reboot.

8.  Now you must restore LVM mirroring to the new disk. If this is a bootable volume group, it involves creating the EFI partitions and formatting partition 1; changing the autoboot file if this was the mirror (not necessary for the primary disk); and, restoring the LVM information to EFI partition 2.

9.  Note: Only necessary for vg00. Rewrite the boot information to the EFI Boot Menu so the system will be able to boot from the new path.

# setboot Primary bootpath : 0/4/1/0.0.0.7.0 HA Alternate bootpath : <none> Alternate bootpath : <none> Autoboot is ON (enabled) # setboot -h 0/4/1/0.0.0.4.0 # setboot Primary bootpath : 0/4/1/0.0.0.7.0 HA Alternate bootpath : 0/4/1/0.0.0.4.0 Alternate bootpath : 0/0/2/0 Autoboot is ON (enabled)