iSCSI存储技术全攻略答疑

iSCSI存储技术全攻略答疑
今天发现存储人论坛上的网友robinson针对我的文章iSCSI存储技术全攻略提出了几个问题,呵呵,先对他对我文章的认可表示感谢,否则他不会提出这些问题。 他提出的问题如下: 1、每秒最大I/O 100,000 IOPS ------------》IO多大? 回答: 存储端的IOPS性能和主机端的IO是不同的,IOPS是指存储每秒可接受多少次主机发出的访问,主机的一次IO需要多次访问存储才可以完成。例如,主机写入一个最小的...

HDS最新USP-V系列性能分析

HDS最新USP-V系列性能分析
转载: cnpmc http://space.doit.com.cn/43519 HDS 在5月中旬正式发布了高端存储新产品: Universal Storage Platform. V (USP V)。这个产品应该只是 TagmaStore USP 的升级版,其定位是和 EMC 的高端存储 DMX-3 进行竞争,目前市场上也只有这两家在高端上有一拼,IBM 那用两个 p5 570 拼起来的盒子很多人都信不过。 看 官方介绍,说 USP V 在性能上有很大提升,iops 达到了 350 万(USP 是 250 万),这样的...

RAID7工作原理图解及特点分析

RAID7工作原理图解及特点分析
RAID 7: Optimized Asynchrony for High I/O Rates as well as High Data Transfer Rates Architectural Features: 1. All I/O transfers are asynchronous, independently controlled and cached including host interface transfers 2. All reads and write are centrally cached via the high speed x-bus 3. Dedicated parity drive can be on any channel 4. Fully implemented process oriented real...

RAID6工作原理图解及特点分析

RAID6工作原理图解及特点分析
RAID 6: Independent Data disks with two independent distributed parity schemes Characteristics/Advantages 1. RAID 6 is essentially an extension of RAID level 5 which allows for additional fault tolerance by using a second independent distributed parity scheme (two-dimensional parity) 2. Data is striped on a block level across a set of drives, just like in RAID 5, and a secon...

RAID5工作原理图解及特点分析

RAID5工作原理图解及特点分析
RAID 5: Independent Data disks with distributed parity blocks Characteristics/Advantages 1. Highest Read data transaction rate 2. Medium Write data transaction rate 3. Low ratio of ECC (Parity) disks to data disks means high efficiency 4. Good aggregate transfer rate Disadvantages 1. Disk failure has a medium impact on throughput 2. Most complex controller design 3. Difficul...

RAID4工作原理图解及特点分析

RAID4工作原理图解及特点分析
RAID 4: Independent Data disks with shared Parity disk Characteristics/Advantages 1. Very high Read data transaction rate 2. Low ratio of ECC (Parity) disks to data disks means high efficiency 3. High aggregate Read transfer rate Disadvantages 1. Quite complex controller design 2. Worst Write transaction rate and Write aggregate transfer rate 3. Difficult and inefficient dat...

RAID3工作原理图解及特点分析

RAID3工作原理图解及特点分析
RAID 3: Parallel transfer with parity Characteristics/Advantages 1. Very high Read data transfer rate 2. Very high Write data transfer rate 3. Disk failure has an insignificant impact on throughput 4. Low ratio of ECC (Parity) disks to data disks means high efficiency Disadvantages 1. Transaction rate equal to that of a single disk drive at best (if spindles are synchronized...
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