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xfs_freeze \- suspend access to an XFS filesystem
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\f3xfs_freeze\f1 [ \f3\-fu\f1 ] mount-point
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suspends and resumes access to an XFS filesystem (see
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halts new access to the filesystem and creates a stable image on disk.
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is intended to be used with volume managers and hardware RAID devices
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that support the creation of snapshots.
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argument is the pathname of the directory where the filesystem
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The filesystem must be mounted to be frozen (see
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The \f3\-f\f1 flag requests the specified XFS filesystem to be
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frozen from new modifications.
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When this is selected, all ongoing transactions in the filesystem
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are allowed to complete, new write system calls are halted, other
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calls which modify the filesystem are halted, and all dirty data,
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metadata, and log information are written to disk.
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Any process attempting to write to the frozen filesystem will block
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waiting for the filesystem to be unfrozen.
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Note that even after freezing, the on-disk filesystem can contain
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information on files that are still in the process of unlinking.
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These files will not be unlinked until the filesystem is unfrozen
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or a clean mount of the snapshot is complete.
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The \f3\-u\f1 option is used to un-freeze the filesystem and allow
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operations to continue.
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Any filesystem modifications that were blocked by the freeze are
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unblocked and allowed to complete.
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One of \f3\-f\f1 or \f3\-u\f1 must be supplied to
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A copy of a frozen XFS filesystem will usually have the same universally
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unique identifier (UUID) as the original, and thus may be prevented from
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The XFS \f3nouuid\f1 mount option can be used to circumvent this issue.
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man/man8/xfs_freeze.8
