---
** [tickets:#21] IMM: Allow imm-pbe to be configured without shared file
system**
**Status:** review
**Created:** Tue May 07, 2013 08:50 AM UTC by Anders Bjornerstedt
**Last Updated:** Fri Oct 11, 2013 10:13 AM UTC
**Owner:** Anders Bjornerstedt
The current implementation of immsv with pbe-enabled requires the
pbe file (imm.db) to reside on a shared file system.
This enhancement proposes to make it possible to configure imm-pbe
so that it does not depend on a shared file system.
Redundancy is of course still required for the imm-pbe file and
the solution is to have the immsv take care of maintaining the
replication and syncing of the imm.db file itself, instead of
relying on the file system level (e.g. drbd) to take care of this.
Note that if OpenSAF is built without pbe enabled, then immsv
is already not directly dependent on any shared file-system.
In that case, the responsiblity for taking backups and securing
redundancy for backups, falls outside of immsv.
So it should already possible to deploy OpenSAF without having
any filsystem that is shared between SC's, at least from the
perspective of the immsv.
The reason for this enhancement is to allow more flexibility
in deployment and more control (ease of troubleshooting) the
lower layers of the immsv. The reason is not primarily enhanced
performance. Performance may be better during circumstances where
currently the shared file-system is heavily loaded or is syncing.
One example is rolling upgrades that need to reboot the SC's.
They will typically cause the shared file-system to go out of
sync two times, in opposite directions in a relatively short time
period.
More details about this enhancement will be presented later.
Migrated from:
http://devel.opensaf.org/ticket/2466
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