Veritas Volume Manager 4.1 Troubleshooting Guide (HP-UX 11i v3, February 2007)

Chapter 1, Recovery from Hardware Failure

Recovery from Failure of a DCO Volume

Note The FastResync feature is not supported by VxVM 4.1 on the HP-UX 11i v3

platform.

Note The procedures in this section depend on the DCO version number. See the

VERITAS Volume Manager Administrator’s Guide for information about DCO

versioning.

Persistent FastResync uses a data change object (DCO) volume to perform tracking of

changed regions in a volume. If an error occurs while reading or writing a DCO volume, it

is detached and the badlog flag is set on the DCO. All further writes to the volume are

not tracked by the DCO.

The following sample output from the vxprint command shows a complete volume

with a detached DCO volume (the TUTIL0 and PUTIL0 fields are omitted for clarity):

TY NAME ASSOC KSTATE LENGTH PLOFFS STATE ...

dg mydg mydg - - - -

dm mydg01 c4t50d0 - 35521408 - -

dm mydg02 c4t51d0 - 35521408 - -

dm mydg03 c4t52d0 - 35521408 - FAILING

dm mydg04 c4t53d0 - 35521408 - FAILING

dm mydg05 c4t54d0 - 35521408 - -

v SNAP-vol1 fsgen ENABLED 204800 - ACTIVE

pl vol1-03 SNAP-vol1 ENABLED 204800 - ACTIVE

sd mydg05-01 vol1-03 ENABLED 204800 0 -

dc SNAP-vol1_dcoSNAP-vol1 - - - -

v SNAP-vol1_dclgen ENABLED 144 - ACTIVE

pl vol1_dcl-03 SNAP-vol1_dclENABLED 144 - ACTIVE

sd mydg05-02 vol1_dcl-03 ENABLED 144 0 -

sp vol1_snp SNAP-vol1 - - - -

v vol1 fsgen ENABLED 204800 - ACTIVE

pl vol1-01 vol1 ENABLED 204800 - ACTIVE

sd mydg01-01 vol1-01 ENABLED 204800 0 -

pl vol1-02 vol1 ENABLED 204800 - ACTIVE

sd mydg02-01 vol1-01 ENABLED 204800 0 -

dc vol1_dco vol1 - - - BADLOG

v vol1_dcl gen DETACHED 144 - DETACH

pl vol1_dcl-01 vol1_dcl ENABLED 144 - ACTIVE

sd mydg03-01 vol1_dcl-01 ENABLED 144 0 -

pl vol1_dcl-02 vol1_dcl DETACHED 144 - IOFAIL

sd mydg04-01 vol1_dcl-02 ENABLED 144 0 RELOCATE

sp SNAP-vol1_snp vol1 - - - -