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Troubleshooting & Diagnostics 
Module Replacement Procedures 
 
 
 
62 
 
 
 
 
 
 
 
Troubleshooting
 
Figure 30. DF Disk Module Replacement/Recovery Flowchart for Attached Physical 
Volumes 
To replace DF
attached physical
Host fail?
Step 1
# lvreduce -m <one less than num_mirrors> -A n <LVname><physical volume path>
lvdisplay
Step 2
Replace faulty
disk drive.
Perform ioscan.
Step 3
# vgcfgrestore -n
Host fail?
Repeat Step 3
                     Step 4
vgchange -a  y <volume group name>
Step 5
Disk mirror
of root?
# mkboot
# lvlnboot -A
Step 6
# lvextend -m <one greater than num_mirrors><LV name><physical volume path>
or
# lvextend -m <one greater than num_mirrors> /path
No
Yes
No
Yes
No
Yes
Flowchart B
 (see MC/ServiceGuard
note in Step 4)