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If something holds the config lock as a writer for too long, MMP will fail to issue MMP writes in a timely manner. This will result either in the pool being suspended, or in an extreme case, in the pool not being protected. If the time to acquire the config lock exceeds 1/10 of the minimum zfs_multihost_interval, report it in the zfs debug log. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #7212
ZFS on Linux is an advanced file system and volume manager which was originally developed for Solaris and is now maintained by the OpenZFS community.
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