On 10-03-17 06:35 AM, Yuri Ushakov wrote:
Hello,
Is it possible to block write to primary node when secondary is not
available?
That is, suppose PostgreSQL asks the filesystem to write some bytes. I'd
like drbd to reply with "write OK" *only* if the data is written to both
nodes. If secondary is unavailable because of network error, reply
should be "not written".
What I understood from reading the docs is that unavailable secondary is
considered non-critical, and drbd continues writing to primary.
Tested that as well - drbdadm disconnect resource, and primary can still
write to mounted device.
Can this behaviour be changed?
Thanks for help,
Yuri.
That would largely defeat the purpose of DRBD. When the second node
disappears, the remaining node gets a "dirty" inode list in memory. When
the node returns, it knows exactly what needs to be updated and syncs
the missing data. This sync operation brings the other node back to
being identical to the good node.
What, exactly, are you trying to accomplish?
--
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