1DRBD-RECONFIGURE-S(7)             DRBD Manual            DRBD-RECONFIGURE-S(7)
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NAME

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

10       drbd-reconfigure-suspend-or-error@RESNAME.service
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DESCRIPTION

14       If a disk fails or a replication link goes down and as a consequence
15       DRBD loses "quorum" or access to good data, DRBD can be configured to
16       either suspend-io or return io-errors.
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18       io-errors allow file systems and applications to notice and stop
19       themselves or be unmounted. The assumption is that some other node(s)
20       will still have good data and some cluster manager or other monitoring
21       entity will notice the situation and try to bring up services there.
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23       suspend-io allows the problematic incident to be hidden from file
24       systems and applications, they would just block until access to good
25       data is restored. This can be useful to cope with supposedly short
26       "network hickup" like incidents without causing service restarts.
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28       But if IO is "suspended" (blocked, frozen, also known as
29       "un-interruptible sleep" or "D state"), applications cannot be killed,
30       file systems cannot be unmounted.
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32       If some other node was told to take over services meanwhile, we need to
33       demote DRBD on the "frozen" node before we can re-integrate it.
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35       In these scenarios it may be useful to configure DRBD for suspend-io
36       during normal operation, so it would mask intermittent problems, but if
37       services had been taken over by some other partition of nodes in the
38       storage cluster, reconfigure for io-error, to be able to bring down
39       services and unmount file systems before trying to re-integrate this
40       node.
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42       This service reconfigures RESNAME for suspend-io when started and for
43       io-error when stopped.
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45       You should test a lot and maybe talk to LINBIT support before using
46       this.
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48       See also the DRBD User’s Guide[1]
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AUTHORS

52       LINBIT HA Solutions GmbH https://linbit.com
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NOTES

55        1. DRBD User’s Guide
56           https://linbit.com/drbd-user-guide/drbd-guide-9_0-en/
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60drbd-utils                        2022-07-10             DRBD-RECONFIGURE-S(7)
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