SLC因为速度快，使用寿命长，一般被用在企业级SSD上。而MLC则多用在消费级市场，如workstation。Fusion-io开发出一种管理MLC闪存
当一个传统的向外扩展的方式对于MySQL来讲变得流行，看看我们不得不扩充哪一方面（便宜的内存？快速存储？更好的电源效率？）将会变得非常有趣。这里确实有很多种选择——我每周大概会遇到一个客户使用Fushion-IO 卡。然而，我却看到了他们一个有趣的选择——他们选择购买一个SSD，当他们每秒仍然能读取很多页的时候（这时，我宁愿选择购买内存来取代），而使用存储驱动器做“写操作”使用。
在这里，我提出几个参考标准来供你确认是否是以上我说的这种情况：
1. 带有BBU的RAID 10硬盘超过8块（所谓BBU，社区的解释是在掉电的情况下，能够cache数据72h，当机器供电正常，再从cache中将数据写入磁盘）
2. Inter SSD X25-E 32GB
3. FushionIO 320GB MLC【1】
Dell PowerEdgeR900
4 QuadCoreIntel(R) Xeon(R) CPU E7320 @ 2.13GHz (16 cores in total)
32GB of RAM
RAID10 on 8disks 2.5” 15K RPMS
FusionIO 160GBSLC
FusionIO 320GBMLC
OS:
CentOS 5.5
XFS filesystem
开始，我们对RAID 10的存储做一个测试以建立一个基线。Y轴是每秒传输的数据（传输速率，它越大越好）。X轴是innodb_buffer_pool_size的大小。
我特地挑选了关于该测试中的三个有趣的点
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