Author Archives: Vadim Tkachenko
MLC SSD card lifetime and write amplification
As MLC-based SSD cards are raising popularity, there is also a raising concern how long it can survive. As we know, a MLC NAND module can handle 5,000-10,000 erasing cycles, after which it gets unusable. And obviously the SSD card … Continue reading
Review of Virident FlashMAX MLC cards
I have been following Virident for a long time (e.g. http://www.mysqlperformanceblog.com/2010/06/15/virident-tachion-new-player-on-flash-pci-e-cards-market/). They have great PCIe Flash cards based on SLC NAND. I always thought that Virident needed to come up with an MLC card, and I am happy to see … Continue reading
Multiple MySQL instances on Fusion-io ioDrive
It is known that MySQL due internal limitations is not able to utilize all CPU and IO resources available on modern hardware. Idea is to run multiple instances of MySQL to gain better performance on Fusion-io ioDrive card. Full report … Continue reading
Intel 320 SSD write performance – contd.
I wrote about Intel 320 SSD write performance before, but I was not satisfied with these results. Somewhat each time on Intel 320 SSD I was getting different write performance, so it made me looking into this with details. So … Continue reading
Intel 320 SSD read performance
While PCI-e Flash cards show great performance, I am often asked about alternatives, as price for PCI-e cards is still significant and not acceptable for small companies and startups. Intel 320 SSD appears to be a popular drive with a … Continue reading
FusionIO 320GB MLC random write performance
I was advised that new drivers and new firmware for FusionIO cards improve performance and stability and it is recommended to review results I’ve got about year ago. Using the same methodology and the same box as for Intel 320 … Continue reading
Intel 320 SSD random write performance
While I like performance provided by PCI-E cards like FusionIO or Virident tachIOn, I am often asked about SATA drives alternatives, as price of PCI-E cards often is barrier, especially for startups. There is wide range of SATA drives on … Continue reading
MySQL 5.5.8 and Percona Server on Fast Flash card (Virident tachIOn)
Crossposted from MySQLPerformanceBlog. This is to follow up on my previous post and show the results for MySQL 5.5.8 and Percona Server on the fastest hardware I have in our lab: a Cisco UCS C250 server with 384GB of RAM, powered … Continue reading
Write performance on Virident tachIOn card
One of the biggest problems with solid state drives is that write performance may drop significantly with decreasing free space. I wrote about this before (http://www.ssdperformanceblog.com/2010/07/free-space-and-write-performance/), using a FusionIO 320GB Duo card as the example. In that case, when space … Continue reading
Free space and write performance
In previous post On Benchmarks on SSD, commenter touched another interesting point. Available free space affects write performance on SSD card significantly. The reason is still garbage collector, which operates more efficiently the more free space you have. Again, to … Continue reading