Le 25/01/2011 07:21, Michael Monnerie a écrit :
On Dienstag, 18. Januar 2011 Cory Coager wrote:Also, I want to stress that I am only having performance issues with one logical volume, the others seem fine.You're getting 40MB/s write speed and says that's fine? I get more performance from a single SATA desktop drive. Your setup seems to suck extremely somewhere. It already starts with your dd speed. I started it on a virtualized VM on an old, overloaded server and get: # dd if=/dev/zero of=test.dd bs=1k count=1M 1048576+0 Datensätze ein 1048576+0 Datensätze aus 1073741824 Bytes (1,1 GB) kopiert, 10,9992 s, 97,6 MB/s I would say this is melted with cache hit, isn't it ? (although I agree it depends on the server's memory dedicated to FS cache) A real cache hit on a real server would give me at least 500 MB/s (actually I get something around 1 GB/s) When it starts to be disk-constrained, on a standard SATA disk, I get from 75 MB/s to 140 MB/s depending on the position of the AG I hit. --
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