How to automatically resync volume groups on AIX V5.3
A sample syncvg.ksh Korn shell script is available which can be invoked from root's cron:
When invoked, the shell script will look for volume groups with stale physical partitions. If a volume group has missing hdisks, the shell script will use dd to drive an I/O to each missing hdisk. If I/Os to all missing hdisks are successful (or if there are stale physical partitions but no missing hdisks), the shell script will issue an AIX syncvg
command in an attempt to resync the volume group.
 | Note
Each time the shell script drives an I/O to a missing hdisk, if the hdisk is still unavailable, a SC_DISK_ERR2 (and perhaps other errors) will be written to the AIX error log (displayed using the errpt command), which should be taken into consideration when deciding how often to run the shell script. |
By default, the shell script sends notes to the root userid regarding successes and failures. (When invoked by a user in a terminal session (rather than as a cron job), the shell script writes messages to the terminal (rather than sending notes) regarding successes and failures.) The shell script can be configured to send notes to other userids, as well or instead, by changing the:
line in the shell script. 
To configure AIX so that the shell script can send a note to a user on another host, follow instructions on the How to configure AIX V5.3 to send mail to users on other hosts web page.
| Note
If rootvg has missing physical volumes, the shell script must manipulate dump devices, as explained in a note on the How to monitor for issues with dump space on AIX V5.3 web page. The shell script requires that two dump devices be allocated (one defined as primary and one as secondary) rather than a single mirrored dump device, as described on the cited web page. The shell script will fail without warning if both dump devices reside on the same hdisk and that hdisk goes missing. |
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