10-24-2010
What do you mean by 'io conflict'? Are you getting hangups where things are waiting for each other forever? I'm not convinced it would do anything to help locking problems like that, which may be fundamental to your application and not to the underlying FS.
A disk image like that would mean the entire filesystem wouldn't get fragmented by the very poor usage patterns you're subjecting it to, just the contents of the disk image.
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LEARN ABOUT DEBIAN
mounting
mounting(7) Miscellaneous Information Manual mounting(7)
NAME
mounting - event signalling that a filesystem is mounting
SYNOPSIS
mounting DEVICE=DEVICE MOUNTPOINT=MOUNTPOINT TYPE=TYPE OPTIONS=OPTIONS [ENV]...
DESCRIPTION
The mounting event is generated by the mountall(8) daemon when it is about to mount a filesystem. mountall(8) will wait for all services
started by this event to be running, all tasks started by this event to have finished and all jobs stopped by this event to be stopped
before proceeding with mounting the filesystem.
The DEVICE, MOUNTPOINT, TYPE and OPTIONS environment variables contain the values of the fstab(5) fields for this mountpoint.
EXAMPLE
A tool that should be run before mounting the /var filesystem might use:
start on mounting MOUNTPOINT=/var
task
SEE ALSO
mounted(7) virtual-filesystems(7) local-filesystems(7) remote-filesystems(7) all-swaps(7) filesystem(7)
mountall 2009-12-21 mounting(7)