I am testing the benefit of my P3700 as an slog and want to use a memory disk as a reference.
Interestingly, it turns out the p3700 outperform the RAM disk. Out of curiosity I did a diskinfo -wS on the RAM disk
Now while this should never be used in production, I was expecting the RAM disk to be at least an order of magnitude faster than any SSDs. Yet it turns out to be slower than my P3700 and quite a bit then the 900p/p4800x, etc. in this thread. Any thoughts?
FYI I am using 1866MHz RAMs if that matters.
mdconfig -a -t swap -s 15g -u 1
Interestingly, it turns out the p3700 outperform the RAM disk. Out of curiosity I did a diskinfo -wS on the RAM disk
Code:
root@freenas:~ # diskinfo -wS /dev/md1 /dev/md1 512 # sectorsize 16106127360 # mediasize in bytes (15G) 31457280 # mediasize in sectors 0 # stripesize 0 # stripeoffset Synchronous random writes: 0.5 kbytes: 21.7 usec/IO = 22.5 Mbytes/s 1 kbytes: 18.7 usec/IO = 52.1 Mbytes/s 2 kbytes: 23.3 usec/IO = 84.0 Mbytes/s 4 kbytes: 23.3 usec/IO = 167.8 Mbytes/s 8 kbytes: 27.5 usec/IO = 284.5 Mbytes/s 16 kbytes: 33.4 usec/IO = 467.9 Mbytes/s 32 kbytes: 44.3 usec/IO = 705.3 Mbytes/s 64 kbytes: 66.4 usec/IO = 941.4 Mbytes/s 128 kbytes: 145.2 usec/IO = 860.9 Mbytes/s 256 kbytes: 244.5 usec/IO = 1022.6 Mbytes/s 512 kbytes: 422.4 usec/IO = 1183.8 Mbytes/s 1024 kbytes: 862.6 usec/IO = 1159.2 Mbytes/s 2048 kbytes: 1691.4 usec/IO = 1182.5 Mbytes/s 4096 kbytes: 3018.9 usec/IO = 1325.0 Mbytes/s 8192 kbytes: 5555.3 usec/IO = 1440.1 Mbytes/s
Now while this should never be used in production, I was expecting the RAM disk to be at least an order of magnitude faster than any SSDs. Yet it turns out to be slower than my P3700 and quite a bit then the 900p/p4800x, etc. in this thread. Any thoughts?
FYI I am using 1866MHz RAMs if that matters.
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