noble (7) drbd-reconfigure-suspend-or-error@.service.7.gz

Provided by: drbd-utils_9.22.0-1build1_amd64 bug

NAME
       drbd-reconfigure-suspend-or-error@.service - System unit to re-configure specific DRBD aspects


SYNOPSIS
       drbd-reconfigure-suspend-or-error@RESNAME.service


DESCRIPTION
       If a disk fails or a replication link goes down and as a consequence DRBD loses "quorum" or access to
       good data, DRBD can be configured to either suspend-io or return io-errors.

       io-errors allow file systems and applications to notice and stop themselves or be unmounted. The
       assumption is that some other node(s) will still have good data and some cluster manager or other
       monitoring entity will notice the situation and try to bring up services there.

       suspend-io allows the problematic incident to be hidden from file systems and applications, they would
       just block until access to good data is restored. This can be useful to cope with supposedly short
       "network hickup" like incidents without causing service restarts.

       But if IO is "suspended" (blocked, frozen, also known as "un-interruptible sleep" or "D state"),
       applications cannot be killed, file systems cannot be unmounted.

       If some other node was told to take over services meanwhile, we need to demote DRBD on the "frozen" node
       before we can re-integrate it.

       In these scenarios it may be useful to configure DRBD for suspend-io during normal operation, so it would
       mask intermittent problems, but if services had been taken over by some other partition of nodes in the
       storage cluster, reconfigure for io-error, to be able to bring down services and unmount file systems
       before trying to re-integrate this node.

       This service reconfigures RESNAME for suspend-io when started and for io-error when stopped.

       You should test a lot and maybe talk to LINBIT support before using this.

       See also the DRBD User’s Guide[1]


AUTHORS
       LINBIT HA Solutions GmbH https://linbit.com


NOTES
        1. DRBD User’s Guide
           https://linbit.com/drbd-user-guide/drbd-guide-9_0-en/