(I am aware I am replying to an old post...) Arne Jansen <sensille <at> gmx.net> writes: > > Now the test for the Vertex 2 Pro. This was fun. > For more explanation please see the thread "Crucial RealSSD C300 and cache > flush?" > This time I made sure the device is attached via 3GBit SATA. This is also > only a short test. I'll retest after some weeks of usage. > > cache enabled, 32 buffers, 64k blocks > linear write, random data: 96 MB/s > linear read, random data: 206 MB/s > linear write, zero data: 234 MB/s > linear read, zero data: 255 MB/s
This discrepancy between tests with random data and zero data is puzzling to me. Does this suggest that the SSD does transparent compression between its Sandforce SF-1500 controller and the NAND flash chips? > cache enabled, 32 buffers, 4k blocks > random write, random data: 41 MB/s (10300 ops/s) > random read, random data: 76 MB/s (19000 ops/s) > random write, zero data: 54 MB/s (13800 ops/s) > random read, zero data: 91 MB/s (22800 ops/s) These IOPS numbers are significantly below the 50000 IOPS announced by OCZ. But I supposed this is due to your benchmark tool not aligning the ops to 4K boundaries, correct? -mrb _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
