关于Fusion-IO SSD映射表内存和CPU资源占用的问题
最近入手一块Fusion-IO IOFX 1.6T SSD，看过浴大的教程，这个SSD的映射表是放在系统内存中的，且使用过程中需要耗费CPU和内存资源，这里想请教浴大，这款盘对CPU和内存资源需要占用多少？我猜测对CPU的占用应该的动态的，仅在发生读写时调用CPU。那么对内存的占用是固定大小还是动态调节的呢？占用量大概有多少呢？是否与存储的数据量有关呢？感谢！http://www.tomsitpro.com/articles/sandisk-fusion-iomemory-sx300-ssd,2-1004-2.html
http://media.bestofmicro.com/R/N/549203/gallery/DRAM_w_600.png
The ioMemory card does not feature any DRAM on the PCB because it utilizes the host RAM for SSD management purposes. The DRAM usage per card varies upon the type of format that users select, and the ioMemory cards default to the 4K sector format to minimize DRAM usage. However, most applications and key operating systems, such as ESXI, do not support 4k sectors. The majority of users will need to utilize the 512-byte format scheme that incurs much higher RAM requirements—nearly 8x the amount of DRAM for the 3.2TB model in comparison to the 4K sector format.
The amount of RAM listed in the chart seems daunting—it can take up to 57.8GB of RAM for a 3.2TB SSD, but SanDisk advises that these are worst-case figures. In comparison, offloaded architectures with onboard ASICs, like the competitors we will be testing the SX300 against today, manage just as much flash capacity with roughly 4GB of low-power onboard DRAM. It is important to note that the majority of I/O requests are 4K even if the application requires 512-byte support, so actual RAM usage will likely be much lower with 512-byte formatting. Users will need to conduct POCs (proof of concept) to ascertain the impact on each unique environment.
本帖最后由 jerrytsao 于 2017-2-16 19:50 编辑
larryexchange 发表于 2017-2-16 19:24
http://www.tomsitpro.com/articles/sandisk-fusion-iomemory-sx300-ssd,2-1004-2.html
Tom's IT Pro不知为何大半年前停止Review Storage产品了, Paul Alcorn现在只在Tom's主站偶尔发表一下深度文章, 看不到高大上东西的新评测有点可惜...
larryexchange 发表于 2017-2-16 19:24
http://www.tomsitpro.com/articles/sandisk-fusion-iomemory-sx300-ssd,2-1004-2.html
学习了，没想到512居然要那么大，之前还想几个G就了事
larryexchange 发表于 2017-2-16 19:24
http://www.tomsitpro.com/articles/sandisk-fusion-iomemory-sx300-ssd,2-1004-2.html
超级感谢！学习了！看来没有大内存还真玩不转这东西。
注意是worst case
实际上用不了那么大
但总之是很大 nighttob 发表于 2017-2-16 21:57
注意是worst case
实际上用不了那么大
但总之是很大
感谢！我实际使用中确实没那么多，占用500M左右比较常见。
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