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...way the filesystem overhead is calculated. It changed slightly in the commit below. The description seems to be wrong; it seems to affect any filesystem going through the ext4 driver (this driver is used for ext2 & ext3 in recent Fedora), and doesn't appear to have anything to do with 'bigalloc'. commit f975d6bcc7a698a10cc755115e27d3612dcfe322 Author: Theodore Ts'o <tytso at mit.edu> Date: Fri Sep 9 19:00:51 2011 -0400 ext4: teach ext4_statfs() to deal with clusters if bigalloc is enabled Rich. -- Richard Jones, Virtualization Group, Red Hat http://people....

Hi All We use CentOS 6.6 for our application. I have profiled the application and find that we have a heavy requirement in terms of Disk writes. On an average when our application operates at a certain load i can observe that the disk writes / second is around 2 Mbps (Average). The block size set is 4k ******************* [root at localhost ~]# blockdev --getbsz /dev/sda3 4096

...will be coming. This release of e2fsprogs has support for clustered allocation. This reduces the number of block (now cluster) bitmaps by allocating and deallocating space in contiguous power-of-2 collections of blocks, which are called clustered. This is a file system level feature, called 'bigalloc', which must be enabled when the file system is initially formatted. It is not backwards compatible with older kernels. Added support for the Multi-Mount Protection (MMP) feature. E2fsck more efficiently uses scratch files for really big file systems. (This is a feature that has to be turne...