Ceph based on ext4

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Hi, all:

    We want to test the stability and performance of ceph with ext4 file
system.
    Here is the information from `mount`,  do we set all attributes
correct?
	
    /dev/sda1 on /srv/osd.0 type ext4
(rw,noatime,nodiratime,errors=remount-ro,data=writeback,user_xattr)

	And from the tutorial at
http://ceph.newdream.net/wiki/Creating_a_new_file_system
	We also disable the journal functionality by ` tune2fs -O
^has_journal /dev/sda1`
     
    Any extra comment to get better performance? Thanks!
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