On Thu, 16 Oct 2025 19:56:54 +0000, Jousma, David wrote:
>We’ve been shared ZFS for quite awhile now. If you wish to reach out off-list
>I’ll be glad to do a back-and forth.
>
A basic exercise:
multiple jobs open the same journal file O_APPEND (is that sh ">>"?)
Each intermittently appends log records to that journal.
The records appear intact and in chronological order.
(I bet DSFS can't do that.)
> _______________________________
>
>CAUTION EXTERNAL EMLIL ...
That's superfluous on a public list.
>The environment is currently running z/OS V3.1 and we plan to implement a
>shared zFS file system across our SYSPLEX of four LPARs.
>I am seeking step-by-step accounts from anyone who has completed a similar
>implementation.
>Background and findings so far:
>
> * We have a SYSPLEX with four LPARs.
> * Preliminary research indicates the following items must be addressed:
> * SYSPLEX root file system configuration
> * System-specific file system configuration on each LPAR
> * Creation and allocation of the CDS.
> * BPX parameters update - SYSPLEX(YES) SYSNAME(&SYSNAME) AUTOMOVE.
>Questions and primary concern:
>
> * What is the recommended sequence of events to enable shared zFS in a
> SYSPLEX?
> * Do all LPARs have to be updated or IPLed simultaneously to enable
> sharing, or can this be accomplished by updating one LPAR at a time?
> * Is it safe to leave the current zFS filesystems in place and then
> unmount/remount the filesystems to change sharing modes when the shared
> configuration is ready?
--
gil
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