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When journal device of an array fails, the array is forced into read-only mode. To make the array normal without adding another journal device, we need to remove journal _feature_ from the array. This patch allows remove journal _feature_ from an array, For journal existing journal should be either missing or faulty. To remove journal feature, it is necessary to remove the journal device first: mdadm --fail /dev/md0 /dev/sdb mdadm: set /dev/sdb faulty in /dev/md0 mdadm --remove /dev/md0 /dev/sdb mdadm: hot removed /dev/sdb from /dev/md0 Then the journal feature can be removed by echoing into the sysfs file: cat /sys/block/md0/md/consistency_policy journal echo resync > /sys/block/md0/md/consistency_policy cat /sys/block/md0/md/consistency_policy resync Signed-off-by: Song Liu <songliubraving@fb.com> Signed-off-by: Shaohua Li <shli@fb.com>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.