C-12 Appendix C
HotSwap Disk Bay (D Class Only)
HotSwap Example
The following example describes a particular system problem where the solution is to
replace a hotswap disk module.
Example configuration:
Volume group /dev/vg00 contains the three disks, with the logical volume configuration
as shown:
Table C-1 Example Configuration
hardware address 52.6.0 52.5.0 52.4.0
device file (/dev/dsk/) c2t6d0 c2t5d0 c2t4d0
The system problem for this example is that the disk at hardware address 52.4.0 has a
head crash, and as a result it is unusable. The steps described in the HotSwap Procedure
section of this document outline a method that can be used to recover from this state.
1. All of the replaced disk's in-use extents must belong to mirrored logical volumes
which were created with the 'strict' option (-s).
2. You must have an up to date configuration backup file. This is done by default each
time an LVM command changes the LVM configuration.
The default backup file's path is:
/etc/lvmconf/base_vg_name.conf.
3. The replacement disk must be the same product ID as the replaced one.
NOTE HP often uses different manufacturers for disks having the same product
number. The hotswap manual procedure will not update the disk driver's
internal information to that of the replaced disk.
The replacement disk will have the same capacity and blocksize as the defective disk
because they have the same product number. The only field that could be incorrect is
the string specifying the vendor's name. This will not affect the behavior of the LVM.
If it is desired to update the manufacturers' name, then the disk's volume group must
be deactivated and reactivated.
4. You must have previously installed the following two software patches:
• PHKL_5840, kernal
• PHCO_5841, utility
Volume Description Volume Description Volume Description
lvol 1 lvol 3 lvol 4
lvol 2 lvol 4 lvol 5
lvol 3 lvol 5
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