В Пн., 29/08/2011 в 07:47 -0300, Adriano dos Santos Fernandes пишет: > On 29/08/2011 06:27, Paul Reeves wrote: > > On Monday 29 August 2011 at 11:05 marius adrian popa wrote: > > > > > >> you are not the only one that observed db/vm performance issues with ext4 > >> maybe you need to mount it with data=writeback > >> > >> http://blog.smartlogicsolutions.com/2009/06/04/mount-options-to-improve-ext > >> 4-file-system-performance/ > >> > > Yes, data=writeback sounds really clever. To quote: > > > > Data ordering is not preserved, data may be written into the main file > > system after its metadata has been committed to the journal. > > That's not everybody opinions: > > http://www.linux-magazine.com/Online/News/Linus-Torvalds-Upset-over-Ext3-and-Ext4 > > Kernel chief Torvalds is hardly convinced by these arguments. In his > view, "if you write your metadata earlier (say, every 5 sec) and the > real data later (say, every 30 sec), you're actually more likely to see > corrupt files than if you try to write them together... This is why I > absolutely detest the idiotic ext3 writeback behavior. It literally does > everything the wrong way around -- writing data later than the metadata > that points to it. Whoever came up with that solution was a moron. No > ifs, buts, or maybes about it."
+1 Certainly writing metadata before data is nonsense. ------------------------------------------------------------------------------ EMC VNX: the world's simplest storage, starting under $10K The only unified storage solution that offers unified management Up to 160% more powerful than alternatives and 25% more efficient. Guaranteed. http://p.sf.net/sfu/emc-vnx-dev2dev Firebird-Devel mailing list, web interface at https://lists.sourceforge.net/lists/listinfo/firebird-devel
