VERITAS Volume Manager 4.1 Troubleshooting Guide

Recovery from Hardware Failure
Failures on RAID-5 Volumes
Chapter 1 21
v r5vol - ENABLED DEGRADED 204800 RAID - raid5
pl r5vol-01 r5vol ENABLED ACTIVE 204800 RAID 3/16 RW
sd disk01-01 r5vol-01disk01 0 102400 0/0 c2t9d0 ENA
sd disk02-01 r5vol-01disk02 0 102400 1/0 c2t10d0 dS
sd disk03-01 r5vol-01disk03 0 102400 2/0 c2t11d0 ENA
pl r5vol-02 r5vol ENABLED LOG 1440 CONCAT - RW
sd disk04-01 r5vol-02disk04 0 1440 0 c2t12d0 ENA
pl r5vol-03 r5vol ENABLED LOG 1440 CONCAT - RW
sd disk05-01 r5vol-03disk05 0 1440 0 c2t14d0 ENA
The volume r5vol is in degraded mode, as shown by the volume state, which is listed as
DEGRADED. The failed subdisk is disk02-01, as shown by the MODE flags; d indicates that
the subdisk is detached, and S indicates that the subdisk’s contents are stale.
NOTE Do not run the vxr5check command on a RAID-5 volume that is in degraded
mode.
A disk containing a RAID-5 log plex can also fail. The failure of a single RAID-5 log plex has
no direct effect on the operation of a volume provided that the RAID-5 log is mirrored.
However, loss of all RAID-5 log plexes in a volume makes it vulnerable to a complete failure.
In the output of the vxprint-ht command, failure within a RAID-5 log plex is indicated by the
plex state being shown as BADLOG rather than LOG. This is shown in the following display,
where the RAID-5 log plex r5vol-02 has failed:
V NAME RVG/VSET/COKSTATESTATE LENGTH READPOL PREFPLEX UTYPE
PL NAME VOLUME KSTATE STATE LENGTH LAYOUT NCOL/WID MODE
SD NAME PLEX DISK DISKOFFS LENGTH [COL/]OFF DEVICE MODE
SV NAME PLEX VOLNAME NVOLLAYR LENGTH [COL/]OFF AM/NM MODE
...
v r5vol - ENABLED ACTIVE 204800 RAID - raid5
pl r5vol-01 r5vol ENABLED ACTIVE 204800 RAID 3/16 RW
sd disk01-01 r5vol-01 disk01 0 102400 0/0 c2t9d0 ENA
sd disk02-01 r5vol-01 disk02 0 102400 1/0 c2t10d0 ENA
sd disk03-01 r5vol-01 disk03 0 102400 2/0 c2t11d0 ENA
pl r5vol-02 r5vol DISABLED BADLOG 1440 CONCAT - RW