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 random write, random data: 84 MB/s random read, random data: 180 MB/s random write, zero data: 224 MB/s randow read, zero data: 190 MB/s cache enabled, 32 buffers, 4k blocks linear write, random data: 93 MB/s linear read, random data: 138 MB/s linear write, zero data: 113 MB/s linear read, zero data: 141 MB/s 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) cache enabled, 1 buffer, 4k blocks linear write, random data: 62 MB/s (15700 ops/s) linear read, random data: 32 MB/s (8000 ops/s) linear write, zero data: 64 MB/s (16100 ops/s) linear read, zero data: 45 MB/s (11300 ops/s) random write, random data: 14 MB/s (3400 ops/s) random read, random data: 22 MB/s (5600 ops/s) random write, zero data: 19 MB/s (4500 ops/s) random read, zero data: 21 MB/s (5100 ops/s) cache enabled, 1 buffer, 4k blocks, with cache flushes: linear write, random data, flush after every write: 5700 ops/s linear write, zero data, flush after every write: 5700 ops/s linear write, random data, flush after every 4th write: 8500 ops/s linear write, zero data, flush after every 4th write: 8500 ops/s Some remarks: The random op numbers have to be read with care: - reading occurs in the same order as the writing before - the ops are not aligned to any specific boundary The device also passed the write-loss-test: after 5 repeats no data has been lost. It doesn't make any difference if the cache is enabled or disabled, so it might be worth to tune zfs to not issue cache flushes. Conclusion: This device will make an excellent slog device. I'll order them today ;) --Arne _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
