>From: Arne Jansen >Sent: Friday, June 25, 2010 3:21 AM > >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
Arne, thanks for doing these tests, they are great to see. Is this the one (http://www.ocztechnology.com/products/solid-state-drives/2-5--sata-ii/maxim um-performance-enterprise-solid-state-drives/ocz-vertex-2-pro-series-sata-ii -2-5--ssd-.html) with the built in supercap? Geoff _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
