| Description |
This update addresses the following issue:
* The mount-point option "no_mbcache" was added for ext4 file systems to
disable the "Filesystem Meta Information Block Cache (mbcache)". The cache
is used to manage shared Extended Attributes (EAs), which are also used to
store Access Control Lists (ACLs) for files and directories. For some
work-loads which use EAs with many different values the cache has
performance issues and can dead-lock the system in certain cases. Samba is
one example which uses EAs to store the DOS attributes and NT-ACLs.
The cache can be disabled by re-mounting the file system using
mount -o remount,no_mbcache "$fs"
or by adding the option "no_mbcache" in '/etc/fstab' and rebooting the
system. |
