проверить статус MMP файловой системы ext4 (Check MMP status of an ext4 file system)
Имя (Name)
e2mmpstatus - Check MMP status of an ext4 file system
Синопсис (Synopsis)
e2mmpstatus [-i] <filesystem>
Параметры (Options)
-i prints out the MMP information rather than check it.
Описание (Description)
e2mmpstatus is used to check Multiple-Mount Protection (MMP)
status of an ext4 file system with the mmp feature enabled. The
specified file system can be a device name (e.g. /dev/hdc1,
/dev/sdb2), or an ext4 file system label or UUID, for example
UUID=8868abf6-88c5-4a83-98b8-bfc24057f7bd or LABEL=root. By
default, the e2mmpstatus program checks whether it is safe to
mount the file system without taking the risk of mounting it more
than once.
MMP (multiple-mount protection) is a feature that adds protection
against the file system being modified simultaneously by more
than one node. It is NOT safe to mount a file system when one of
the following conditions is true:
1. e2fsck is running on the file system.
2. the file system is in use by another node.
3. The MMP block is corrupted or cannot be read for some
reason.
The e2mmpstatus program might wait for some time to see whether
the MMP block is being updated by any node during this period.
The time taken depends on how frequently the MMP block is being
written by the other node.
Статус выхода (Exit)
The exit code returned by e2mmpstatus is 0 when it is safe to
mount the file system, 1 when the MMP block shows the file system
is in use on another node and it is NOT safe to mount the file
system, and 2 if some other failure occurred that prevents the
check from properly detecting the current MMP status.
Смотри также (See also)
dumpe2fs(8), e2fsck(8), fstab(5), fsck(8),
