as far as I know, since 2.6.33, linux supports 'full' TRIM command, the IO problem is solved
On Tue, Nov 23, 2010 at 4:07 PM, Andreas Dilger <[email protected]>wrote: > Note that testing of the "discard" mount option (by other ext4 filesystem > developers, not related to Lustre) has shown that it can significantly hurt > the io performance due to the slowness of the TRIM commands, and the kernel > implements TRIM like a barrier so it slows down all of the IO. > > Cheers, Andreas > -- > Andreas Dilger > Lustre Technical Lead > Oracle Corporation Canada Inc. > >
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