{"id":797,"date":"2013-12-03T05:58:37","date_gmt":"2013-12-03T05:58:37","guid":{"rendered":"http:\/\/poojanwagh.opalstacked.com\/techblog\/?p=797"},"modified":"2013-12-03T05:59:34","modified_gmt":"2013-12-03T05:59:34","slug":"797","status":"publish","type":"post","link":"https:\/\/tech.poojanblog.com\/blog\/unix-linux\/797\/","title":{"rendered":"Kingston SV100 64 GB (SV100S264G) Sequential Random Write Benchmark"},"content":{"rendered":"

This SSD <\/a>caught my eye as a ZIL. I wonder how it compares to my previously benchmarked<\/a> (a number of times) Kingston SV100 64 GB SSD.<\/p>\n

I decided to remove it from the ZIL and try it out. I wanted to make sure I exercise the sequential writes (which is all I really care about in a ZIL–I think) with random data, as some SSD controllers get their speed from compression.<\/p>\n

In order to do this test, I first wrote the random data to a memory file system. I then wrote from the memory file system to the SSD.<\/p>\n<\/p>\n

Poojan@server ~ >!df
\ndf -h -t ufs
\nFilesystem\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Size\u00a0\u00a0\u00a0 Used\u00a0\u00a0 Avail Capacity\u00a0 Mounted on
\n\/dev\/gpt\/usbrootfs\u00a0\u00a0\u00a0\u00a0 42G\u00a0\u00a0\u00a0 7.4G\u00a0\u00a0\u00a0\u00a0 31G\u00a0\u00a0\u00a0 19%\u00a0\u00a0\u00a0 \/
\n\/dev\/md0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 247M\u00a0\u00a0\u00a0 8.0k\u00a0\u00a0\u00a0 227M\u00a0\u00a0\u00a0\u00a0 0%\u00a0\u00a0\u00a0 \/var\/tmp
\nPoojan@server ~ >dd if=\/dev\/random of=\/var\/tmp\/random bs=1M count=100
\n100+0 records in
\n100+0 records out
\n104857600 bytes transferred in 1.048121 secs (100043413 bytes\/sec)
\nPoojan@server ~ >dd if=\/dev\/random of=\/var\/tmp\/random bs=1M count=100
\n100+0 records in
\n100+0 records out
\n104857600 bytes transferred in 1.048035 secs (100051629 bytes\/sec)
\nPoojan@server ~ >dd if=\/var\/tmp\/random of=\/dev\/null bs=1M count=100
\n100+0 records in
\n100+0 records out
\n104857600 bytes transferred in 0.012362 secs (8482249780 bytes\/sec)
\nPoojan@server ~ >dd if=\/var\/tmp\/random of=\/dev\/null bs=1M count=100
\n100+0 records in
\n100+0 records out
\n104857600 bytes transferred in 0.012305 secs (8521529347 bytes\/sec)
\nPoojan@server ~ >dd if=\/var\/tmp\/random of=\/dev\/null bs=1M count=100
\n100+0 records in
\n100+0 records out
\n104857600 bytes transferred in 0.012351 secs (8489781699 bytes\/sec)
\nPoojan@server ~ >sudo dd if=\/var\/tmp\/random of=\/dev\/gpt\/tank_zil0 bs=1M count=100
\n100+0 records in
\n100+0 records out
\n104857600 bytes transferred in 0.641571 secs (163438858 bytes\/sec)
\nPoojan@server ~ >sudo dd if=\/var\/tmp\/random of=\/dev\/gpt\/tank_zil0 bs=1M count=100
\n100+0 records in
\n100+0 records out
\n104857600 bytes transferred in 0.641162 secs (163543088 bytes\/sec)
\nPoojan@server ~ >sudo dd if=\/var\/tmp\/random of=\/dev\/gpt\/tank_zil0 bs=1M count=100
\n100+0 records in
\n100+0 records out
\n104857600 bytes transferred in 0.641077 secs (163564741 bytes\/sec)
\nPoojan@server ~ >sudo dd if=\/var\/tmp\/random of=\/dev\/gpt\/tank_zil0 bs=10M count=10
\n10+0 records in
\n10+0 records out
\n104857600 bytes transferred in 0.643163 secs (163034263 bytes\/sec)
\n<\/code>\n

With random data, we’re seeing around 155 MB\/s. This SSD is great for sequential writes.<\/p>\n