Le Tue, 25 Mar 2008 19:42:28 -0400 vous écriviez:As I mentioned, it looks like 2.4 actually buffers write data on RAID-1 which is inherently bad (after all if I do RAID-1 it's for the sake of data integrity, and write caching just counters that). However, how bad dd may be, it reflects broadly my problem : on small systems using software RAID, IO is overall way better with 2.4 than 2.6, especially NFS thruput. Though I can substantially enhance 2.6 performance through tweaking (playing with read ahead, disk queue length etc), it still lags behind 2.4 with defaults settings by a clear margin (10% or more). This isn't true - fortunately - of larger systems with 12, 24, 48 disks drives, hardware RAID, Fibre Channel and al. -- -------------------------------------------------- Emmanuel Florac www.intellique.com -------------------------------------------------- --
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