m using a couple of these for log devices (ZIL). I’ve benchmarked them before, but the system is way more stable (got rid of some old SATA cables etc). I removed them from the tank, and here are some dd benchmarks:
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server# dd if=/dev/zero of=/dev/gpt/tank_zil0 bs=4M count=32 32+0 records in 32+0 records out 134217728 bytes transferred in 0.823378 secs (163008623 bytes/sec) server# dd if=/dev/zero of=/dev/gpt/tank_zil0 bs=4M count=128 128+0 records in 128+0 records out 536870912 bytes transferred in 3.420138 secs (156973470 bytes/sec) server# dd if=/dev/zero of=/dev/gpt/tank_zil0 bs=4M count=1024 1024+0 records in 1024+0 records out 4294967296 bytes transferred in 26.639669 secs (161224498 bytes/sec) server# dd if=/dev/zero of=/dev/gpt/tank_zil1 bs=4M count=32 32+0 records in 32+0 records out 134217728 bytes transferred in 0.871419 secs (154022044 bytes/sec) server# dd if=/dev/zero of=/dev/gpt/tank_zil1 bs=4M count=128 128+0 records in 128+0 records out 536870912 bytes transferred in 3.344363 secs (160530097 bytes/sec) server# dd if=/dev/zero of=/dev/gpt/tank_zil1 bs=4k count=128 128+0 records in 128+0 records out 524288 bytes transferred in 0.015540 secs (33737700 bytes/sec) server# dd if=/dev/zero of=/dev/gpt/tank_zil1 bs=4k count=8192 8192+0 records in 8192+0 records out 33554432 bytes transferred in 0.957342 secs (35049580 bytes/sec) |
They’re roughly in the 150 MB/s range with large (4MB) records, and 32 MB/s with 4kB records.
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